Abstract
This study compares brain activation during causal attribution to three different loci, the self, another person and the situation; and further explores correlations with clinical scales (i.e. depression, anxiety and autism) in a typical population. While they underwent functional magnetic resonance imaging, 20 participants read short sentences about another person (‘someone’) who engaged in behaviors with the participant or made comments about the participant. The participants then attributed these behaviors to three attribution loci: themselves, the other person or the situation. The results revealed common activation across the three attribution loci in the bilateral temporo-parietal junction (TPJ), left posterior superior temporal sulcus, precuneus and right temporal pole (TP). Comparisons between the attribution loci revealed very little differences, except for increased activation of the right TP while making attributions to the situation compared with the self. In addition, when making attributions to the situation or other persons for negative events, there were reliable correlations between low activity in the left TPJ and high levels of anxiety and problematic social interaction in autism. The results indicate that attributions to different loci are based on the same underlying brain process, which might be atypical among persons with anxiety or autism symptoms.
Keywords: causal attribution, fMRI, psychopathology, autism, anxiety
INTRODUCTION
Identifying causes of human behavior within the self, another person or situational circumstances enables us to understand what is going on in our social interaction, and provides a guideline for future contact. To categorize these causes requires us to understand not only the situational context but also the psychology of other people’s mind: their intention, aims and thoughts. This knowledge on others’ mental states is called mentalizing. Attributing causality is, therefore, highly dependent on mentalizing capacities that promote adequate social understanding and interaction of healthy individuals. Impairment of these mentalizing capacities leads to faulty causal attribution tendencies and is inherent to clinical conditions such as depression, anxiety and autism (Arkin et al., 1980; Hope et al., 1989; Dykema et al., 1996; Kinderman and Bentall, 1996, 1997; Craig et al., 2004). The goal of this research is to explore brain areas that support causal attribution, and to analyze which of these areas are associated with mentalizing and correlate with clinical scales measuring depression, anxiety and autism in a healthy population.
Causal attribution and the brain
According to Kelley (1973), causes of observed behavior are typically attributed to the agent who acts out the behavior, the observer’s own behavior or feelings or to situational circumstances of the context. Distinguishing between causes that are internal (i.e. self) or external (i.e. other people or circumstances) has been termed the locus dimension of causality (Russel, 1982; Weiner, 1985). However, a limitation of current neuroimaging research on causal attribution is that comparisons have been made only between self and other (Farrer and Frith, 2002), between self and external causes (collapsing across another person and the situation; Blackwood et al., 2003; Seidel et al., 2010), between other and situational causes (ignoring the self; Kestemont et al., 2013) and one study only examined other person attributions (Harris et al., 2005). To avoid this limitation, in this study, we classify causes along the three possible loci of the locus dimension, that is, the self, the other person or the situation, and investigate the neural correlates of each attribution locus separately and in comparison with each other. We make use of a recent self-report questionnaire, the Internal, Personal and Situational Attributions Questionnaire (IPSAQ) designed and developed by Kinderman and Bentall (1996), which allows causes to be classified along the three loci of the locus dimension, and so improves on the earlier 2-fold self-external distinctions used in previous studies.
According to recent meta-analyses (Van Overwalle, 2009; Mar, 2011; Denny et al., 2012; Schilbach et al., 2012), mentalizing or understanding the causes of social behavior, recruits a network of midline and temporal brain areas. According to Van Overwalle (2009), some of these areas are responsible for the understanding of temporary or here-and-now behaviors and beliefs in the current situation, including the temporo-parietal junction (TPJ), and the precuneus (PC), while the posterior superior temporal sulcus (pSTS) provides amodal sensory input to these mentalizing areas. As this study is set in the context of single, temporary events, these areas are especially relevant in this study. In addition, the medial prefrontal cortex (mPFC) is responsible for the identification of stable and abstract characteristics of persons such as traits (see also Harris et al., 2005; Lieberman, 2007; Carrington and Bailey, 2009; Mitchell, 2009; Ma et al., 2012). In addition, the temporal poles (TPs) are sometimes recruited during mentalizing, and are believed to be involved in memory-related processing of social information (Olson et al., 2007; Ross and Olson, 2010).
In a recent functional magnetic resonance imaging (fMRI) study on causal attributions (Kestemont et al., 2013), participants read short descriptions of behaviors or events and made attributions to the agent (i.e. another person) or the situation. Scanning revealed activation in brain areas typically involved in mentalizing about single, temporary events (e.g. Kornap gets a present), including the TPJ, pSTS and PC. Interestingly, stronger activation of these mentalizing areas was found in attributions to the situation compared with the person (Kestemont et al., 2013). A number of studies reported a similar increase of activation for external attributions in the TPJ and PC (Farrer and Frith, 2002; Seidel et al., 2010) and pSTS (Blackwood et al., 2003), although they did not make a fine-grained distinction between external persons and situations. These results are consistent with the notion that attributions to the other person are often made spontaneously while situation attributions require more elaborate processing, in line with behavioral research (cf. fundamental attribution bias; Gilbert et al., 1988).
Clinical symptoms and attributional biases
One of the major advantages of a self-report methodology as we use here is that a person’s subjective interpretation of the causal locus of an event is an important predictor of psychological well-being and future behavior (Peterson et al., 1982; Russel, 1982; Weiner, 1985; Van Overwalle, 1989; Dykema et al., 1996). Personal styles or biases in attributional thinking may be indicative of maladaptive functioning and psychopathology (Buchanan and Seligman, 1995).
A plethora of behavioral studies has documented that healthy people tend to protect their self-esteem and psychological well-being by showing a self-serving bias, or the tendency to make attributions to the self after positive events, while blaming external factors for negative events (Miller and Ross, 1975; Peterson et al., 1982; Van Overwalle, 1989; Kinderman and Bentall, 1996). In contrast, clinical groups often show a reversed bias, called a self-blaming bias, in which negative events are attributed to themselves and positive events externally. This self-blaming pattern is typical among depressed (Peterson et al., 1982, 1985; Peterson and Seligman, 1984; Kinderman and Bentall, 1997; Diez-Alegria et al., 2006; Northoff, 2007) and anxious individuals (Arkin et al., 1980; Hope et al., 1989), but seems to be absent among autistic individuals (Blackshaw et al., 2001; Craig et al., 2004). Based on these findings, it seems plausible that the neurological underpinnings of these biases might serve as diagnostic signals of these pathologies.
Neuroimaging research on attributional biases started only recently, and seems to indicate that self-blaming attributions in clinical populations—although made quite often—recruit more activity in mentalizing areas than healthy controls. For instance, increased activation in the mPFC reflecting self-blaming attributions was found for depressed (Yoshimura et al., 2010, 2013; but see Seidel et al., 2012) and anxious individuals (Paulesu et al., 2010). However, we know of no reports of differential mentalizing activity reflecting biased attributional processing among autistic individuals.
Present research and hypotheses
The first goal of this study is to measure brain activity during attributions of a single, temporary event. We use events as described in the IPSAQ, as this material is open to personal interpretations of the implied cause, which makes it more sensitive to deviations indicative of clinical dysfunctioning. Contrary to prior research, we distinguish not only between internal vs external attributions but also divide attributions further up into three distinct, more fine-grained causal loci, including the self, another person and the situation. We expect that these distinct attribution loci will induce mentalizing about momentary acts or thoughts of someone else based on goals, wishes and mood states of that person at that moment. This generally recruits activation in areas involved during mentalizing about temporary or here-and-now events (cf. pSTS, TPJ, PC; Van Overwalle, 2009) rather than the mPFC because activity in this area typically reflects stable (person) attributions such as traits (Van Overwalle, 2009). Moreover, based on our earlier findings (Kestemont et al., 2013), we predict that activation in these mentalizing areas will be further increased during causal attributions that emphasize the situation, because this requires increased effortful processing relative to attributions made to the other person (Kestemont et al., 2013).
The second goal of this study is to correlate brain activity with increasing levels of subclinical psychopathology. We expect that subclinical levels of psychopathology reveal a typical pattern of self-blaming, especially given symptoms of depression and anxiety, both at the behavioral and neurological level (i.e. increasing mentalizing activity). In contrast, our sample as a whole is expected to show a healthy, self-serving bias.
METHODS
Participants
Twenty right-handed Dutch-speaking participants were recruited for this study. Their age ranged from 18 to 41 years, with a mean age of 23.2 years. Nine of the participants were men, 11 were women. Participants were paid €10 and received a CD with their structural scanning images in exchange for their participation. The participants were recruited via university mailing lists. All the participants had normal or corrected-to-normal vision, and none of them reported any abnormal neurological history. All participants complied with the following selection criteria: no internal metal objects or artificial implants, no dental brackets or other important dentures, no increased risk for epileptic attacks, no psychiatric diagnosis and no pregnant women or women giving breastfeeding. Informed consent was obtained in a manner approved by the Medical Ethics Committee of the University Hospital Ghent (where the study was conducted) and the Vrije Universiteit Brussel (of the principal investigator).
Stimulus material
The stimulus material consisted of 80 experimental (see ‘Appendix’ section) and 40 baseline sentences. The experimental sentences described behaviors and thoughts of someone else involving you (e.g. Someone lies to you and Someone thinks you are smart). These sentences were the same as used in the study of Seidel et al. (2010) translated from German into Dutch, but the actor in Seidel’s sentences (‘a friend’) was changed into an unspecified ‘someone’ to allow for a more unbiased assessment of attributions (e.g. as a self-bias might include also people close to us, such as friends). Of these sentences, 40 had a positive valence and 40 had a negative valence. Note that of the 80 experimental sentences borrowed from Seidel et al. (2010), 32 were based on the sentences of the IPSAQ (Kinderman and Bentall, 1996). The 40 baseline sentences described semantic statements of which participants had to judge whether they were true, false or unknown (e.g. Tokio is the main city of Japan). These sentences involved non-mental facts, which are typically used as baseline in mentalizing studies (Van Overwalle, 2009).
A pilot-study (N = 124) ensured that the three loci (‘self’, ‘other person’ and ‘situation’) were used about equally often: 28% were attributed to the self, 42% to the other person and 30% to the situation. During the fMRI experiment, the attributions were respectively 30%, 41% and 29%.
Procedure
The participants were instructed to read each event very carefully and to imagine that it happened to them, to think about a cause of the event and to categorize it as something in the self, in the other person or in the situation. Several examples and descriptions were given in pre-training sessions, to become familiar with the different tasks.
During functional scanning, each experimental trial started with the instruction (2 s): ‘search cause’, followed by a fixation cross (jittered between 3 and 5 s). Next, the experimental sentence was presented (5.5 s), followed by a fixation cross (0.5 s). Finally, a question appeared: ‘the cause lies in:’ and participants had to choose between ‘self’, ‘other person’ or ‘situation’ by pressing the appropriate response button. This means that participants could assign the same experimental sentence to different causal categories. The question was presented for 7 s or until a response was given. The procedure was identical for baseline trials, except that the question was: ‘Is this true?’ and participants responded by pressing the appropriate button ranging from 1 = no, 2 = I don’t know, to 3 = yes.
Clinical scales
After scanning, participants filled in a booklet with several questionnaires.
Hospital Anxiety and Depression Scale
The Hospital Anxiety and Depression Scale (HADS) is a self-report questionnaire, screening for the presence of anxiety and depressive states. It consists of 14 items divided into two subscales: depression and anxiety. A validated Dutch version by Spinhoven et al. (1997) was used (Zigmond and Snaith, 1983).
Autism-spectrum Quotient
The questionnaire consisting of 50 items divided over two subscales (attention to detail and social interaction) is a self-report questionnaire screening the degree of development of autistic characteristics in adults. Hoekstra et al. (2008) translated and validated the questionnaire for a Dutch population (Baron-Cohen et al., 2001).
Imaging procedure
Images were collected with a 3 T magnetrom Trio MRI scanner system (Siemens Medical Systems, Erlangen, Germany), using an eight-channel radiofrequency head coil. Stimuli were projected onto a screen at the end of the magnet bore that participants viewed by a mirror mounted on the head coil. Stimulus presentation was controlled by E-Prime 2.0 (www.pstnet.com/eprime; Psychology Software Tools) under Windows XP. Foam cushions were placed within the head coil to minimize head movements. We first collected a high-resolution T1-weighted structural scan (MP RAGE) followed by one functional run of 922 volume acquisitions (30 axial slices; 4 mm thick; 1 mm skip). Functional scanning used a gradient-echo echo planer pulse sequence (repetition time = 2 s; echo-time = 33 mm; 3.5 mm × 3.5 mm × 4.0 mm resolution).
Image processing
The fMRI data were preprocessed and analyzed using SPM8 (Wellcome Department of Cognitive Neurology, London, UK). For each functional run, data were preprocessed to remove sources of noise and artifact. Functional data were corrected for differences in acquisition time between slices for each whole-brain volume, realigned within and across runs to correct for head movement. The functional data were then transformed into a standard anatomical space (2 mm isotropic voxels) based on the ICBM152 brain template [Montreal Neurological Institute (MNI)], which approximates Talairach and Tournoux atlas space. Normalized data were then spatially smoothed (6 mm full-width at half-maximum) using a Gaussian Kernel. Finally, realigned data were examined, using the Artifact Detection Tool software package (ART; http://www.nitrc.org/projects/artifact_detect), for excessive motion artifacts and for correlations between motion and experimental design, and between global mean signal and experimental design. Outliers were identified in the temporal differences series by assessing between-scan differences using the default criteria of ART (Z-threshold: 3.0 mm; scan to scan movement threshold: 0.5 mm; rotation threshold: 0.02 radians). These outliers were omitted from the analysis by including a single regressor for each outlier. No correlations between motion and experimental design or global signal and experimental design were identified. Six directions of motion parameters from the realignment step as well as outlier time points (defined by ART) were included as nuisance regressors. We used a default high-pass filter of 128 s and serial correlations were accounted for by the default auto-regressive AR(1) model.
Statistical analysis
The statistical analysis of the fMRI data involved first-level single participant analyses with a regressor for each condition time-locked at the presentation of the sentence, six movement artifact regressors, and a variable amount of artifact regressors determined by ART, and applying a canonical response function with event duration set to 0, using the general linear model of SPM8 (Wellcome Department of Cognitive Neurology). Analyses of interest were performed at the group second-level on the parameter estimates (regressors) associated with each condition using a random-effects model. The statistical analysis involved two within-participants factors: attribution locus (self, other person or situation) and valence (positive or negative event), with the truth statements as baseline. A whole-brain analysis of variance (ANOVA) failed to reveal significant main effects of attribution locus or valence, or their interaction [this was largely confirmed by a % signal change (% SC) analysis described below]. Hence, all further neuroimaging analyses were conducted omitting the valence factor.
To test our specific hypotheses, we computed contrasts between each attribution locus condition and the truth baseline, as well as their conjunction. We also tested the attributional biases using the following contrasts for the self-serving bias (positive self + negative other + negative situation) − (negative self + positive other + positive situation) and the reverse contrast for the self-blaming bias. All contrasts were first computed on a priori regions of interest (ROIs) with the small volume correction in SPM8 (Wellcome Department of Cognitive Neurology). The ROIs involved a sphere of 8 mm radius around the centers (in MNI coordinates) of areas that were identified in the meta-analysis of Van Overwalle (2009) and Van Overwalle and Baetens (2009) as involved in mentalizing: 0, −60, 40 (PC), ±50, −55, 10 (pSTS), ±50, −55, 25 (TPJ), 0, 50, 20 (mPFC), and by Sugiura et al. (2006) as involved in person identity, ±45, 5, −30 (TP). Next, we conducted a whole-brain analysis to identify other significant regions, using a voxel-based statistical threshold of P ≤ 0.001 (uncorrected). For both ROI (small-volume) and whole-brain analyses, we list only those areas that survive a threshold of P ≤ 0.05, family-wise error (FWE) corrected, and a minimum volume of 10 voxels (or 5 if there are 10 voxels in another contrast, see Table 1).
Table 1.
Self > truth |
Other > truth |
Situation > truth |
Conjunction |
||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Anatomical label | Brodmann | x | y | z | Voxels | Max t | x | y | z | Voxels | Max t | x | y | z | Voxels | Max t | x | y | z | Voxels | Max t |
ROI | |||||||||||||||||||||
mPFC | 9 | 4 | 56 | 22 | 15 | 3.87** | |||||||||||||||
R TP | 21 | 48 | 8 | −36 | 7 | 3.72* | 48 | 8 | −36 | 51 | 5.13*** | 50 | 4 | −34 | 61 | 5.44*** | 48 | 8 | −36 | 7 | 3.72* |
R TPJ | 13 | 44 | −50 | 26 | 225 | 6.17*** | 44 | −50 | 26 | 247 | 6.36*** | 44 | −50 | 26 | 249 | 6.74*** | 44 | −50 | 26 | 225 | 6.17*** |
L TPJ | 39 | −44 | −56 | 30 | 238 | 6.33*** | −44 | −58 | 28 | 242 | 6.52*** | −44 | −56 | 30 | 230 | 6.26*** | −44 | −56 | 30 | 230 | 6.26*** |
R pSTS | 22/39 | 46 | −54 | 16 | 39 | 4.16** | 46 | −52 | 16 | 57 | 4.15** | ||||||||||
L pSTS | 22 | −56 | −56 | 14 | 18 | 4.36** | −56 | −56 | 14 | 48 | 4.91*** | −56 | −56 | 14 | 47 | 4.89*** | −56 | −56 | 14 | 18 | 4.36** |
PC | 7 | −6 | −64 | 40 | 257 | 7.61*** | 2 | −60 | 40 | 257 | 7.87*** | 2 | −60 | 40 | 257 | 7.26*** | 2 | −60 | 40 | 257 | 7.26*** |
Other regions | |||||||||||||||||||||
L frontal-sup-medial (dmPFC) | 9 | −10 | 52 | 40 | 515 | 5.30* | |||||||||||||||
R mid-temporal | 21 | 54 | −6 | −22 | 434 | 6.34** | 52 | −6 | −24 | 368 | 6.51*** | ||||||||||
Cingulate gyrus | 23 | −4 | −20 | 28 | 563 | 6.59*** | −4 | −18 | 28 | 528 | 6.80*** | −4 | −20 | 28 | 341 | 6.59*** | |||||
Posterior cingulate cortex | 31 | −10 | −48 | 34 | 2478 | 8.03*** | −10 | −48 | 34 | 1964 | 8.18*** | −10 | −48 | 34 | 1960 | 7.48*** | −10 | −48 | 34 | 1764 | 7.48*** |
R sup-temporal | 40 | 66 | −48 | 24 | 2048 | 6.45*** | 66 | −48 | 22 | 3007d | 6.58*** | 66 | −48 | 22 | 2520 | 6.75*** | 66 | −48 | 22 | 1564 | 6.45*** |
R supramarginal | 40 | 66 | −30 | 28 | 3007d | 6.43*** | |||||||||||||||
L angular | 39 | −38 | −56 | 28 | 2447c | 8.48*** | −38 | −56 | 28 | 3299e | 9.32*** | −38 | −56 | 28 | 2121g | 9.32*** | −38 | −56 | 28 | 1850h | 8.48*** |
L supramarginal | 40 | −60 | −48 | 30 | 2447c | 6.45*** | −60 | −48 | 30 | 3299e | 7.05*** | −62 | −48 | 30 | 2121g | 6.65*** | −60 | −48 | 30 | 1850h | 6.45*** |
L mid-temporal | 21/22 | −60 | −56 | 16 | 2447c | 5.46* | −60 | −58 | 16 | 2121g | 6.01** | −60 | −56 | 16 | 1850h | 5.64* | |||||
L sub-gyral (temporal lobe) | 21/22 | −46 | −36 | −6 | 3299 | 5.95** | −46 | −36 | −6 | 484 | 5.41* |
Coordinates refer to the MNI stereotaxic space. ROIs are spheres with 8 mm radius around coordinates 0, −60, 40 (PC), ±50, −55, 10 (pSTS), ±50, −55, 25 (TPJ), 0, 50, 20 (mPFC) and ±45, 5, −30 (TP). R, right; L, left; dmPFC, dorsomedial prefrontal cortex. All clusters thresholded at P < 0.001 (for ROIs corrected after small volume analysis; for other regions corrected after whole-brain analysis) with a minimum cluster threshold of 10 (or 5 if >10 elsewhere on the same row). Only peaks that are significant (P < 0.05, FWE corrected) in at least one contrast are listed. Clusters with the same superscript activate more than one region.
*P < 0.05, **P < 0.01, ***P < 0.001, FWE corrected.
In addition, the mean % SC in each ROI was extracted using the MarsBar toolbox (http://marsbar.Sourceforge.net) for all attribution locus by valence conditions. For behavioral and imagining data (% SC), we computed correlations with the clinical questionnaires [subscales of the HADS and Autism-spectrum Quotient (AQ)]. To avoid false positives given the large number of correlations involved, we used stricter Bonferroni-corrected thresholds. First, for the behavioral data, the hypothesized correlations between clinical scales and attribution ratings were thresholded at an uncorrected level (P < 0.05), although further exploratory correlations were corrected at a stricter threshold of P < 0.01 (corrected for 3 attribution loci and 2 levels of valence; or P < 0.05/6 ≈ 0.01). Second, for the imaging data, the correlations with clinical scales were restricted to the three most important mentalizing areas that were significant in the main analysis (bilateral TPJ and PC). The hypothesized correlations were thresholded at P < 0.01 (corrected for 3 attribution loci and 2 levels of valence; or P < 0.05/6 ≈ 0.01), and further exploratory analyses were thresholded at a stricter P < 0.005 (corrected for 3 attribution loci, 2 levels of valence and 3 brain areas; or P < 0.05/18 ≈ 0.005).
RESULTS
Behavioral results
To test for a self-serving bias, we compared internal (self) vs external attributions (other person or situation) taking valence into account. A repeated measures ANOVA revealed a main effect of attribution locus [F(1, 19) = 117.09, P < 0.001] indicating that more attributions were made to external causes than to internal causes. More importantly, in line with the self-serving bias, there was a significant interaction between attribution locus and valence [F(1, 19) = 14.71, P = 0.001] showing that this tendency was larger for negative events (Mexternal = 30.45 and Minternal = 9.40) than for positive events (Mexternal = 25.30 and Minternal = 14.40).
Correlations between clinical scales and attributions confirmed our hypothesis that participants with increased depressive symptoms (on the HADS) showed increased self-blaming in that they made more attributions of positive events to the other person (r = 0.49, P < 0.05), although they did not make more attributions of negative events to the self (r = 0.13, ns). Contrary to our predictions, participants with anxiety symptoms did not show the hypothesized self-blaming bias. An exploratory analysis using a stricter level of P < 0.01 (see ‘Methods’ section) further revealed that autistic symptoms of attention to detail were associated with a self-blaming trend, in that there was a negative correlation between autistic symptoms and (self-serving) attributions of negative events to another person (r = −0.64, P < 0.005).
Imaging results
Attributions to the self, another person and the situation
We predicted activity in mentalizing areas dealing with judgments of temporary events (cf. PC, pSTS and TPJ) across all attribution loci, although we also expected that activity would further increase for attributions to the situation.
As predicted, each attribution locus > truth baseline contrast showed almost identical activation patterns for attributions to the self, another person and situation. A conjunction analysis of these three comparisons confirmed this similarity across all attribution loci (Table 1; Figure 1). Consistent with our hypothesis, the conjunction revealed activation in a priori defined ROIs involving the PC, right TP, bilateral TPJ and left pSTS (P < 0.05, small-volume FWE corrected). Additional activations in the conjunction were revealed by the whole-brain analysis, and revealed activations often extending from the ROIs: the (posterior) cingulate cortex (adjacent to the PC), the right superior temporal gyrus (adjacent to the STS), the left angular gyrus and left supramarginal gyrus (adjacent to the pSTS and TPJ) and left medial temporal gyrus (P < 0.05, whole-brain FWE corrected).
We also directly compared attribution loci among each other, and found only one significant difference indicating that situation attributions generated stronger activation in the right TP than self attributions (P < 0.05, small-volume FWE corrected), which only partly supports our hypothesis of greater mentalizing activation during situation attributions.
Clinical scales and attributional biases
An initial analysis on our whole participant sample (see ‘Methods’ section) revealed no mentalizing activity reflecting a self-serving or self-blaming bias. Next, we tested our hypothesis that psychopathological symptoms are associated with increased mentalizing activity revealing self-blaming attributions, using a corrected threshold of P < 0.01 (see ‘Methods’ section). However, none of the predicted correlations was significant. We then further explored other correlations between subclinical levels of psychopathology and mentalizing activity for the most important mentalizing ROIs which were significant in the conjunction (i.e. bilateral TPJ and PC), using a strict threshold of P < 0.005 (see ‘Methods’ section). Unexpectedly, we found that activation in the left TPJ was associated with less rather than more self-blaming attributions. In particular, when making attributions of negative events to the situation or to other persons, activity in the TPJ correlated negatively with increased scores on the Problematic Social Interaction subscale of the AQ (Figure 2; although the correlation with other person attributions, r = −0.46, P < 0.05, did not meet the strict P < 0.005 threshold), and on the Anxiety subscale of the HADS (P < 0.005; Figure 3). No other correlations surpassed the strict threshold.
DISCUSSION
This study explored the mentalizing brain areas involved in causal attributions distinguishing for the first time between three causal loci: the self, the other person or the situation. Moreover, we explored the relationship between brain activity during (biased) causal attribution and psychopathology scores on clinical scales in a typical population.
At the behavioral level, our results for our whole (healthy) sample revealed a self-serving bias, in line with the findings in the literature (e.g. Kinderman and Bentall, 1996). Moreover, we found limited support for the predicted reversal into a self-blaming bias given clinical symptoms. In particular, self-blaming was associated with depressive symptoms as reported in earlier studies (Peterson et al., 1982, 1985; Peterson and Seligman, 1984; Kinderman and Bentall, 1997; Yoshimura et al., 2010, 2013; Seidel et al., 2012), but not with anxious symptoms, contrary to earlier studies (Arkin et al., 1980; Hope et al., 1989). Moreover, autistic symptoms (i.e. attention to detail) were associated with decreased self-serving attributions.
At the neural level, our imaging findings confirmed that all three attribution loci (self, another person and situation) recruited mentalizing ROIs dealing with social understanding of temporary, here-and-now, events (i.e. TPJ, pSTS and PC) as well as the TP. A whole-brain analysis revealed additional areas that were most often extensions from these ROIs. This confirms and extends research from our laboratory documenting activation of the same mentalizing areas when the self was not involved (Kestemont et al., 2013). Moreover, it moves away from the limited focus of earlier research on the comparison between internal vs external attributions (collapsed across another person and situation), in which the separate contribution of each attribution loci was neglected (Farrer and Frith, 2002; Blackwood et al., 2003; Seidel et al., 2010). Consistent with predictions, as our participants were requested to provide a cause for a temporary event rather than an enduring trait about an agent, the mPFC was not engaged (see also Ma et al., 2012).
Moreover, our study shows that most differences between attribution loci reported by (Kestemont et al., 2013) disappear when all loci are taken into consideration and included in a response. This might indicate that the underlying process of identifying and selecting a cause is independent of the locus (i.e. the self, another person or situation) where the cause is finally assigned to. Perhaps, briefly considering various internal or external loci is a natural process, although we cannot exclude the possibility that this overlap has been induced somewhat artificially by the experimental instruction to decide between these distinct loci. Nevertheless, we found that situation attributions generated stronger activation only in the right TP compared to self attributions, and thus might require deeper context-related memory-related processing (Olson et al., 2007; Ross and Olson, 2010). In the previous study by Kestemont et al. (2013), situation attributions recruited mentalizing areas more broadly, as increased activity was not only found in the TP but also in the bilateral pSTS and TPJ. Perhaps, this decreased differential activation for situation attributions is due to the additional involvement of the self in this study. Behavioral research (Jones and Nisbett, 1972; Taylor and Fiske, 1975; Ross, 1977; Gilbert and Malone, 1995) has demonstrated that when the self is an active agent, the situation becomes more salient. This phenomenon is known as the actor–observer difference, and is often explained by an increased visual saliency of the environment by an active agent, who behaves in accordance to the limits set by the external situation (in contrast to a mere observer; Jones and Nisbett, 1972; Taylor and Fiske, 1975; Ross, 1977; Gilbert and Malone, 1995). Thus, by including the self, the situation might have become more prominent than in the previous study by Kestemont et al. (2013), reducing the differences in saliency and processing load for all three attribution loci in this study.
In line with the limited behavioral evidence for attributional biases given elevated symptoms of psychopathology, we found little neural correlates of the predicted self-blaming bias. This failure is most likely due to our selection of a non-clinical sample, where these biases are presumably less extreme, in contrast to earlier research that used clinical subsamples and biases were neurologically detectable (Blackwood et al., 2003; Paulesu et al., 2010; Yoshimura et al., 2010, 2013; Seidel et al., 2012).
Nevertheless, exploratory correlations at a corrected threshold between brain activation and clinical symptoms revealed that there were robust negative correlations between autism and anxiety scores and left TPJ activation when making self-serving attributions to the situation and other persons for negative events. Although unexpected, this pattern was systematic among anxious and autistic symptoms, for external attributions to both the person and the situation. This pattern is, therefore, of clinical importance, as it may suggest that participants with lower levels of anxiety and autism (i.e. less problematic social interaction) recruit enhanced TPJ processing to make self-serving attributions. In contrast, those with elevated levels of anxiety or autism seem to recruit less TPJ processing to make the same self-serving attributions. One potential explanation why these latter individuals easily engage in this self-serving pattern is because they immediately and automatically reject external people and situations as threatening.
Of interest also is the fact that the behavioral response does not differ between those low or high on these pathological symptoms. It may suggest that high functioning individuals with anxiety or autism may use compensatory strategies to avoid maladaptive and deviant thinking patterns that are quite successful. We therefore suggest that lowered TPJ activation during self-serving attributions might possibly serve as a neural marker of implicit clinical symptoms of anxiety and autism, which are not always revealed by self-report questionnaires. To explore this promising hypothesis, further research in sub-clinical and clinical symptoms of these psychopathologies is necessary.
CONCLUSION
The main contribution of this study is that after causal attributions to the self, the other person or the situation, we found activation in the predicted mentalizing areas responsible for causal attributions to temporary events (which excludes the mPFC), and that this pattern was almost identical across the three attribution loci. This confirms and extends earlier findings, in particular by Kestemont et al. (2013), who distinguished only between attributions of another person and the situation, but did not include the self. Also new in this study are the unexpected, but robust inverse correlations between left TPJ activation and subclinical levels of anxiety and autism during external (person or situation) attributions, showing that decreased TPJ activity during self-serving attributions is associated with increased pathology. These initial results pave the way for more research on social attribution patterns in clinical populations and early clinical diagnosis in sub-clinical populations, and perhaps psychotherapeutic treatment.
Acknowledgments
This research was funded by GOA68 and SRP15 grants awarded by the Vrije Universiteit Brussels, Belgium. This research was supported by an OZR Grant of the Vrije Universiteit Brussel to F.V.O. and performed at Ghent Institute for Functional and Metabolic Imaging (GIfMI).
Appendix
Experimental sentences (best possible translation from Dutch)
List of experimental sentences | |
---|---|
Someone helps you to learn | |
Someone sends you a postcard | |
Someone thinks that you are sensitive | |
Someone brings you home | |
Someone helps you gardening | |
Someone is going for a walk with you | |
Someone thinks that you are reliable | |
Someone thinks that you are interesting | |
Someone buys you a gift | |
Someone thinks that you are smart | |
Someone praises your new hairstyle | |
Someone says that he admires you | |
Someone invites you for a drink | |
Someone says that you are nice | |
Someone says that she respects you | |
Someone thinks that you are a good listener | |
Someone visits you to have a chat | |
Someone repairs your car for free | |
Someone thinks that you are humorous | |
Someone thinks that you are fair | |
Someone asks about your health | |
Someone looks forward to your visit | |
Someone bakes a cake for you | |
Someone tells you that she considers you important | |
Someone invites you to the cinema | |
Someone helps you to move out | |
Someone trusts you a secret | |
Someone says that you are reliable | |
Someone thinks that you are intelligent | |
Someone praises your tasteful clothes | |
Someone defends you against others | |
Someone thinks that you are brave | |
Someone thanks you for your advice | |
Someone greets you warmly | |
Someone lends you his car | |
Someone takes time for you | |
Someone appreciates your charm | |
Someone makes a trip with you | |
Someone gives water to your plants | |
Someone offers you to help | |
Someone refuses to talk to you | |
Someone thinks that you are stupid | |
Someone makes a hurtful comment about you | |
Someone starts a quarrel with you | |
Someone thinks that you are dishonest | |
Someone thinks that you are unfriendly | |
Someone thinks that you are unfair | |
Someone talks about you behind your back | |
Someone says that she doesn’t respect you | |
Someone refuses to help you | |
Someone says that she resents you something | |
Someone asks you to leave | |
Someone ignores you | |
Someone doesn’t show up on your birthday | |
Someone is disappointed in you | |
Someone says that he doesn’t like you | |
Someone makes you ridiculous to others | |
Someone forgets an appointment with you | |
Someone misuses your trust | |
Someone says that he finds you boring | |
Someone doesn’t return your call | |
Someone thinks that you are naive | |
Someone speaks ill of you | |
Someone says that you are intolerant | |
Someone didn’t keep contact for quite a while | |
Someone says that you irritate him | |
Someone laughs at you | |
Someone lies to you | |
Someone doesn’t give about your opinion | |
Someone doesn’t visit you in the hospital | |
Someone lets you wait repeatedly | |
Someone says that she has no time for you | |
Someone says that he doesn’t care about your problems | |
Someone ignores your request | |
Someone lets you wait for a long time | |
Someone doesn’t invite you for her party | |
Someone doesn’t accept your advice | |
Someone ignores your phone calls | |
Someone says that you are a coward | |
Someone says that your behavior is embarrassing |
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