Abstract
Alcohol misuse is associated with sleep disturbance and cognitive dysfunction. However, the neural processes inter-relating the severity of alcohol use, sleep disturbance and cognitive performance remain under-investigated. We addressed this issue with a dataset of 964 subjects (504 women) curated from the Human Connectome Project. Participants were assessed with the Pittsburgh Sleep Quality Index (PSQI) and fMRI while identifying relational dimension pictures and matching dimension pictures (as a control) in alternating blocks. Imaging data were analyzed with published routines and the results were evaluated at a corrected threshold. Subjects showed lower accuracy rate and longer reaction time (RT) in relational than control blocks. The difference in RT between the two blocks (RTRel-Con) was driven primarily by the RT and correlated positively with performance accuracy of relational trials, suggesting that a more cautious response (i.e., longer RTRel-Con) improved accuracy. The severity of alcohol use, identified from principal component analysis of drinking metrics, was positively correlated with sleep disturbance. Further, whole-brain regression identified activity of the superior colliculus (SC) during relational vs. control blocks in positive and negative correlation with RTRel-Con and PSQI score, respectively. Mediation and path analyses demonstrated a significant model: more severe alcohol use → greater sleep → disturbance diminished SC activity → impaired performance. These findings support the influences of alcohol misuse on sleep and suggest neural correlates that mediate the relationship between sleep disturbance and altered sustained attention in young adults.
Keywords: alcohol use disorder, sleep quality, attention, superior colliculus, thalamus
1. Introduction
1.1. Alcohol misuse and sleep disturbance
Alcohol misuse is known to be associated with sleep disturbance (Chakravorty et al., 2016; He et al., 2019). Heavy alcohol use and alcohol use disorder (AUD) have been linked to subjective reports of insomnia and polysomnographic findings of sleep disturbance (Arnedt et al., 2011; Crum et al., 2004; Dorrian et al., 2017; Haario et al., 2013). Epidemiologic studies showed that frequent alcohol consumption is associated with insomnia symptoms in both young (Miller et al., 2017) and older adults (Canham et al., 2015; Wang et al., 2016). The association between insomnia and heavy drinking is bi-directional; that is, heavy drinking predicts future insomnia symptoms and conversely insomnia increases the risk of heavy drinking (Haario et al., 2013). Heavy alcohol consumption has been linked to abnormal circadian, such as core body temperature, rhythm (Danel et al., 2001) and salivary melatonin levels (Rupp et al., 2007). Other studies associated alcohol consumption with later bedtime in adolescents (Hasler et al., 2017) and college students (Adan, 1994; Onyper et al., 2012), and with short night sleep duration (< 6 hours) (Chakravorty et al., 2016) and breathing-related sleep disorders (Kolla et al., 2018). Thus, a substantial literature has associated sleep disturbance with alcohol misuse.
1.2. Influence of sleep disturbance on attention
Sleep serves a multitude of physiological functions, including enhancement of immune defense (Besedovsky et al., 2012) and clearance of brain metabolites (Xie et al., 2013). Sleep is integral to cognitive functioning (Brownlow et al., 2020; Lowe et al., 2017; Scullin and Bliwise, 2015); for instance, sleep promotes memory encoding and consolidation (Stickgold, 2005). Poorer sleep, as characterized by questionnaire (e.g., Pittsburgh Sleep Quality Index; PSQI) assessment, is associated with impairment in executive function (Benitez and Gunstad, 2012), working memory (Fortier-Brochu and Morin, 2014; Shekleton et al., 2014), inhibitory control (Fortier-Brochu and Morin, 2014; Haimov et al., 2008), and sustained attention (Altena et al., 2008; Varkevisser and Kerkhof, 2005). Sustained attention showed circadian and homeostatic variations (Valdez, 2019), and sleep restriction impaired sustained attention (Shenfield et al., 2020), which is required to meet a wide array of cognitive challenges. For instance, in adolescents, sleep of a shorter than recommended duration and lack of recovery sleep for 1 to 7 nights can have deleterious effects on a wide range of cognitive functions including alertness (Lo et al., 2016) and visual attention (Agostini et al., 2017; Louca and Short, 2014). Poor sleep quality as evaluated by actigraphy is associated with inferior performance on tasks of working memory (Steenari et al., 2003) and executive functioning (Kuula et al., 2015).
The two most widely studied cognitive domains in sleep deprivation research are working memory and attention (Alhola and Polo-Kantola, 2007). Working memory requires sustained attention (Baddeley et al., 1999), which is impaired by sleep deprivation and restored after sleep (Hudson et al., 2020). Using a within-subject design with rested wakefulness and sleep deprivation counterbalanced across participants, a study reported that sleep deprivation resulted in lower inferior frontal and inferior occipital cortical activities bilaterally during visual contrast discrimination (Chee and Tan, 2010). Further, sleep deprivation attenuated brain activation independently of task difficulty, suggesting a non-specific effect on cognition, most likely a loss of sustained attention/vigilance. Another study of within-subject effects showed higher ventrolateral thalamic activity during visual attention when subjects were sleep-deprived overnight, potentially suggesting a compensatory process (Portas et al., 1998). Tomasi and colleagues likewise reported higher thalamic activation after sleep deprivation than during rested wakefulness in an attention task, and thalamic activity increased with task difficulty only during rested wakefulness (Tomasi et al., 2009). Total sleep deprivation was associated with longer reaction time (RT) and higher activity in frontal and posterior midline regions of the default mode network in the Psychomotor Vigilance Test (Drummond et al., 2005). Sleep deprivation altered perceptual sensitivity and the effects of interstimulus interval on RT in the Psychomotor Vigilance Test (Yang et al., 2018). Other studies suggest inter-subject variation in the effects of sleep deprivation on attention (Krause et al., 2017) and the potential roles of heritability (Kuna et al., 2012) and frontoparietal network activity (Cui et al., 2015) in accounting for the individual differences. Not surprisingly, impairment in attention and other cognitive processes have also been noted for clinical conditions that manifest sleep disturbance, including chronic obstructive pulmonary disease, obstructive sleep apnea, and primary insomnia (Fortier-Brochu et al., 2012; Olaithe et al., 2018; Stranks and Crowe, 2016; Torres-Sánchez et al., 2015).
1.3. Alcohol consumption and attention
These studies together demonstrate the influences of sleep disturbance on cognitive performance, particularly in behavioral tasks that require sustained attention. An extensive literature characterizes how alcohol misuse influences cognitive processing (Le Berre et al., 2017; Spear, 2018). For instance, individuals with alcohol use disorders relative to healthy controls showed decreased activation of parietal and prefrontal cortices during visual attention (Zehra et al., 2019). Acute alcohol intoxication altered electroencephalographic dynamics in visual control processing (Schiller et al., 2021) and event-related potentials during task switching (Wolff et al., 2018). Alcohol hangover was associated with deficits in selective attention (Devenney et al., 2019). On the other hand, the studies have not assessed sleep disturbance and it remains unclear whether or how sleep disruption may play a role in manifesting cognitive dysfunction. No work to our knowledge has investigated the neural processes inter-linking alcohol misuse, sleep disturbance and cognitive dysfunction.
1.4. The present study
The present study addressed this issue with clinical and imaging data of the Human Connectome Project (HCP), where the alcohol consumption and sleep disturbance measures were available from assessment with the Semi-Structured Assessment and the Genetics of Alcoholism and PSQI, respectively. We focused on the relational task, which queries individuals’ sustained attention during visual pattern matching, and broadly hypothesized that, across individuals, more severe alcohol use would lead to sleep disturbance and in turn influence the neural processes and performance in the relational task. We employed mediation and path analyses to characterize the inter-relationships of these clinical, neural and behavioral variables. Identifying the neural substrates relating the severity of alcohol use, sleep disturbance, and cognitive performance would advance both sleep and addiction medicine.
2. Materials and Methods
2.1. Dataset
We have obtained permission from the HCP to use both the Open and Restricted Access data for the current study. We employed the 1200 Subjects Release (S1200) data set, which includes 3T MR imaging and behavioral data collected of the Relational task from 1039 subjects. A total of 964 subjects were included in the study, after the exclusion of 75 subjects who had head movements greater than 2mm in translation or 2 degrees in rotation or for whom the images failed in registration to the template. All subjects were physically healthy with no severe neurodevelopmental, neuropsychiatric or neurologic disorders. Participants provided written informed consent and all aspects of the study, including subject recruitment, experimental procedures were conducted according to a protocol in accordance with the Declaration of Helsinki and approved by the Washington University Institutional Review Board (IRB #201204036; title: “Mapping the Human Connectome: Structure, Function and Heritability”).
Participants were evaluated with the Pittsburgh Sleep Quality Index (Buysse et al., 1989), which contains 19 self-rated questions. The 19 self-rated items are combined to 7 component scores, each of which was scored from 0 to 3 with “0” and “3” each indicating no and severe difficulty with sleep. Thus, individuals ranged from 0 to 21 in PSQI score, with a higher score representing worse sleep quality.
The HCP data comprised 15 inter-related drinking metrics to assess alcohol use behavior (Supplementary Table S1). We performed a principal component analysis on the 15 measures. Four principal components showed an eigenvalue > 1, with the first principal component (PC1) accounting for 49.15% and the other components each accounting for 9.66%, 8.89% and 7.17% of the variance. All drinking metrics loaded substantially on the PC1, and we used the PC1 to represent drinking severity in current study. Note that six of the 15 measures were reversed score so a higher PC1 weight indicated greater severity of alcohol use.
Table 1 shows the demographics, clinical and behavioral measures of the participants.
Table 1.
Characteristic | Men (n = 460) | Women (n = 504) | t | p value |
---|---|---|---|---|
Age, Years | 27.9 ± 3.7 | 29.4 ± 3.6 | −6.58 | <0.001 |
Education, Years | 14.9 ± 1.7 | 15.1 ± 1.8 | −1.66 | 0.098 |
PSQI score | 4.6 ± 2.5 | 4.8 ± 2.9 | −1.92 | 0.055 |
Drinking PC1 | 0.3 ± 1.0 | −0.3 ± 0.8 | 9.78 | <0.001 |
ARRel-Con, % | −21.1 ± 16.5 | −21.2 ± 16.9 | −0.05 | 0.960 |
RTRel-Con, ms | 494 ± 307 | 503 ± 308 | −0.27 | 0.789 |
Note: ARRel-con, the difference in accuracy rate between relational and control blocks. Age and years of education were controlled for in the two-sample t test of PSQI score, drinking PC1 weight, ARRel-con and RTRel-con.
2.2. Imaging protocol and relational task for fMRI
Imaging protocols are described in previous studies (Li et al., 2020a, b) and in Supplementary Methods.
Each participant completed two runs each of six blocks (three relation and three control) of the relational task (Barch et al., 2013; Smith et al., 2007) in a fixed order (first run: relation, control, control, relation, control, relation; second run: relation, control, relation, control, control, relation). Details of relational task are described in Supplementary Methods.
2.3. Imaging Data Modeling and Statistics
We followed published routines (Zhang et al., 2019; Zhornitsky et al., 2019) in data preprocessing and model constructing, as also described in Supplementary Methods.
We constructed for each individual subject the statistical contrast “relational vs. control.” In group analyses, we conducted a one-sample t test of the contrast “relational vs. control” to identify regional responses and a two-sample t test of the same contrast to identify sex differences between men and women with age and years of education as covariates. We also conducted voxel-wise regressions of the contrast (relational - control) against the differences in accuracy rate (relational - control; ARRel-Con), differences in reaction time (relational - control; RTRel-Con) of correct trials, PSQI score, and drinking PC1 weight, all with age, sex and years of education as covariates. We evaluated the results at an uncorrected voxel p < 0.001, in combination with cluster p < 0.05, corrected for FWE of multiple comparisons, on the basis of Gaussian random field theory, as implemented in SPM. We identified brain regions using the Data Processing & Analysis of Brain Imaging toolbox (DPABI) (Yan et al., 2016) and an atlas (Duvernoy, 2009), if the peak was not identified by the DPABI.
Functional regions of interest (ROIs) were defined based on clusters obtained from whole-brain analysis. In ROI analysis, we used MarsBar (http://marsbar.sourceforge.net/) to derive for each individual subject the activity (β’s averaged across voxels) for the ROIs.
2.4. Mediation and Path Analyses
We performed mediation analyses following published routines (MacKinnon et al., 2007; Wager et al., 2008), as detailed in the Supplementary Methods and our previous work (Zhang et al., 2019; Zhornitsky et al., 2019), to evaluate the relationships between neural markers, PSQI score and RT across all subjects (see Results).
Following up on mediation analysis and the findings of a significant correlation between PC1 of alcohol use severity and PSQI score (see Results), we performed path analyses (Supplementary Methods) to examine the interrelationship between alcohol use severity and PSQI score, superior colliculus activity and RT of correct trials.
3. Results
3.1. Drinking severity, PSQI score, and task performance
Men showed higher drinking severity PC1 than women (t = 9.78, p < 0.001); men and women did not differ significantly in PSQI score (Table 1).
For AR, an ANOVA (sex × block) showed a significant block main effect (F = 1021.6, p < 0.001) but not sex main effect (F = 0.4, p = 0.517) or sex × stimulus interaction (F = 0.0, p = 0.953) with age and years of education as covariates. In post-hoc analyses both men’s and women’s AR was higher for the control than relational blocks (p’s < 0.001) (Supplementary Figure S1A).
For RT, an ANOVA (sex × block) showed a significant block main (F = 1100.0, p < 0.001) but not sex main (F = 0.0, p = 0.933) or sex × block interaction (F = 0.1, p = 0.768) effect with age and years of education as covariates. Both men and women (p’s < 0.001) showed longer RT during relational than control trials (Supplementary Figure S1B).
For all subjects, we computed the difference in AR and RT during relational vs. control blocks, ARRel-Con and RTRel-Con, respectively. We performed pairwise regression among the four variables: drinking severity PC1, PSQI score, ARRel-Con and RTRel-Con for men and women separately with age and years of education as covariates and tested for slope differences between the sexes. None of the six regressions showed a significant difference in slope between men and women (all p’s > 0.285; Supplementary Table S2). Thus, we combined men and women in all subsequent analyses. Across all subjects, the PSQI score was correlated significantly with PC1 (r = 0.10, p = 0.002; Figure 1A). None of the other regressions yielded significant correlations (all p’s > 0.074).
To better understand the source of the RT difference between the relational vs. control blocks, RTRel-Con, we observed that RTRel-Con was positively correlated with RTRel (r = 0.77, p < 0.001; Figure 1B) but not with RTCon (r = 0.00, p = 0.962; Figure 1C). Further, RTRel-Con was positively correlated with ARRel (r = 0.14, p < 0.001; Figure 1D), suggesting that overall, a slower response during relational vs. control blocks, likely reflecting sustained attention and cautious responding, facilitates performance accuracy.
3.2. Brain activations to relational vs. control blocks
We conducted a two-sample t test to compare men and women with age and years of education as covariates on the contrast of relational vs. control blocks, and no clusters showed sex differences at uncorrected voxel p < 0.001, in combination with cluster p < 0.05, corrected for FWE. We thus examined the regional responses for the entire cohort a one-sample t test. Supplementary Figure S2 shows the results. Relational vs. control blocks involved higher activation in bilateral superior/inferior frontal cortex, bilateral supplementary motor area, bilateral insula, bilateral inferior parietal cortex, bilateral precuneus. Conversely, control vs. relational involved higher activation in the bilateral orbitofrontal cortex, anterior, middle and posterior cingulate, bilateral calcarine, bilateral superior temporal cortex and bilateral hippocampus. Many of these brain regions were contiguous to form larger clusters, as summarized in Supplementary Table S3.
3.3. Brain activations in correlation with PSQI score, PC1, ARRel-Con, and RTRel-Con
A cluster encompassing the right pulvinar and superior colliculus (SC; x = 6, y = −26, z = −6, volume = 568 mm3, T = 4.37) showed activities during relation vs. control blocks in negative correlation with PSQI (Figure 2A), with age, sex and years of education as covariates. No clusters showed positive correlation with PSQI score at the same threshold.
Figure 2B shows regional activations to the same contrast in correlation with RTRel-Con of correct trials across all subjects with sex, age and years of education as covariates (clusters summarized in Table 2). RTRel-Con was positively correlated with activation in bilateral fusiform, supplementary motor area cortex, insula, precuneus, caudate, middle occipital cortex and the SC. No clusters showed significant negative correlation with RTRel-Con at the same threshold.
Table 2.
Region | Cluster | Peak | Cluster | MNI coordinate (mm) | ||
---|---|---|---|---|---|---|
| ||||||
size (k) | Voxel (T) | FWE P-value | X | Y | Z | |
Positive | ||||||
Fusiform_R | 6923 | 18.50 | 0.000 | 26 | −78 | −10 |
Supp_Motor_Area_L | 1673 | 13.70 | 0.000 | 0 | 16 | 50 |
Insula_L | 3151 | 11.09 | 0.000 | −32 | 24 | −6 |
Occipital_Mid_R | 674 | 10.67 | 0.000 | 30 | −76 | 16 |
Insula_R | 1371 | 9.56 | 0.000 | 34 | 24 | −2 |
Precuneus_R | 111 | 8.30 | 0.000 | 4 | −62 | 42 |
Caudate_L | 806 | 8.26 | 0.000 | −14 | 6 | 14 |
Superior colliculus | 78 | 7.56 | 0.000 | −2 | −28 | −2 |
Note: R: right; L: left.
The SC showed activations both in positive correlation with RTRel-Con and in negative correlation with PSQI score. We computed the β estimates of the SC and visualized the correlation in Pearson regressions in Figure 2C (r = 0.21, p < 0.001) and 2D (r = −0.14, p < 0.001).
Figure 3A shows the regional activations in positive correlation with PC1. Summarized in Table 3, the clusters with activities correlated with PC1 involved left inferior frontal, left precentral, left lingual cortex, bilateral supplementary motor area, and bilateral middle cingulum. Figure 3B shows the regional activations in positive correlation with RTRel-Con again in order to highlight the clusters in positive correlation with both PC1 and RTRel-Con, with age, sex and years of education as covariates. We computed the average β estimates of these clusters and visualized the correlations in Pearson regressions in Figure 3C (RTRel-Con: r = 0.42, p < 0.001) and 3D (PC1: r = 0.19, p < 0.001).
Table 3.
Region | Cluster size (k) | Peak Voxel (T) | Cluster FWE P-value | MNI coordinate (mm) |
||
---|---|---|---|---|---|---|
X | Y | Z | ||||
Positive | ||||||
Frontal_Inf_Oper_L | 204 | 5.01 | 0.000 | −50 | 14 | 8 |
Precentral _L | 76 | 4.55 | 0.007 | −34 | 0 | 44 |
Supp_Motor_Area_R | 109 | 4.10 | 0.001 | 8 | 12 | 50 |
Lingual_L | 76 | 4.05 | 0.007 | −4 | −80 | 2 |
Cingulum_Mid_L | 56 | 3.97 | 0.032 | 0 | 30 | 36 |
Note: R: right; L: left.
Whole brain linear regression of the contrast “relational — control” against ARRel-Con across all subjects, with sex, age and years of education as covariates, showed that ARRel-Con was positively correlated with activation of bilateral middle cingulum, left putamen and supramarginal gyrus (Supplementary Figure S3; clusters summarized in Supplementary Table S4). None of the clusters showed overlaps with those obtained with regression vs. the PSQI score or vs. PC1.
3.4. Mediation and path analyses
The shared regional activities of SC may represent the neural substrates interlinking sleep disturbance and RT in the relational task. Thus, we performed mediation analyses to examine the inter-relationship between activities of SC, PSQI score and RTRel-Con. For the sake of completeness, we evaluated all 6 models, although the models with activities of SC as dependent variables were conceptually unlikely. The results showed the model PSQI → activities of SC → RTRel-Con with the best fit (c - c’ = −3.61, p < 0.001; Figure 4A). Supplementary Table S5 shows the statistics of all other models. Further, PC1 was positively correlated with PSQI (r = 0.10, p = 0.002) across all subjects. We performed path analyses to examine the inter-relationship between alcohol use severity (PC1), sleep disturbance (PSQI), activities of SC and RT of correct trials, and the model PC1 → PSQI → activities of SC → RTRel-Con showed a good fit (Figure 4B; Fit indices: RMSEA = 0.04 [90% CI: 0.02 0.07], χ2/df = 2.65, SRMR = 0.03, and CFI = 0.91). Other path models and fit statistics are shown in Supplementary Figure S4 and Supplementary Table S6.
Figure 3B shows the regional activation both in positive correlation with PC1 and RTRel-Con (highlighted in cyan), with age, sex and years of education as covariates. The shared regional activities may represent the neural substrates interlinking drinking severity and RTRel-Con in the relational task. However, in the mediation analyses to examine the inter-relationship between the shared correlates, PC1 and RTRel-Con, no models showed a significant fit (all p’s > 0.097).
4. Discussion
Relational vs. control visual stimulus matching required sustained attention and involved higher activity in bilateral superior/inferior frontal cortex, supplementary motor area, insula, precuneus and inferior parietal cortex. Conversely, control vs. relational trials involved higher activity in the bilateral superior temporal cortex, hippocampus and calcarine. The findings mirror those reported in earlier imaging studies (Barch et al., 2013; Smith et al., 2007; Tomasi and Volkow, 2019). We identified regional brain responses in correlation with individual differences in RT and sleep quality. The SC demonstrated activities during relational vs. control blocks each in negative and positive correlation with PSQI score and RTRel-Con. Mediation and path analyses showed that SC activity mediated the relationship between drinking severity, sleep disturbance and attentional performance. Together, these findings support the influences of heavier drinking on sleep and suggest the neural substrates interrelating alcohol consumption, sleep disturbance and attentional dysfunction.
4.1. The superior colliculus, visual attention and sleep disturbance
The SC is a dome-shaped subcortical laminar structure in the mammalian midbrain, with the superficial layers receiving visual inputs directly from the retina in a topological map (Chan et al., 2011; Olivé et al., 2018). Cortical and subcortical regions involved in eye movement control project directly or indirectly to the SC (Merker, 2013). Together with the pulvinar, a thalamic nucleus critical for visual processing and attentional control (Bridge et al., 2016; Kastner et al., 2020) and projecting to the SC (May, 2006), the SC may be involved with directing eye movements between the stimuli during the relational task (Hu et al., 2019; Robinson and McClurkin, 1989).
Preclinical studies investigated SC activities in sleep. Sleep is regulated by circadian mechanisms, and in the absence of a circadian clock, overall sleep-wake rhythmicity is preserved and remains synchronized to the external light-dark cycle (Lupi et al., 2008). Neuronal activities of the SC are not eliminated during sleep (Cohen and Castro-Alamancos, 2010). Melanopsin-dependent sleep regulation was correlated with the activation of sleep-promoting neurons in the ventrolateral preoptic area and the SC (Lupi et al., 2008). A rodent study showed that dark and light signals affect sleep-wake behaviors through distinct pathways comprising the SC (Zhornitsky et al., 2019), and the regulatory effects appear independent from cortical visual processes (Miller et al., 1998). Thus, sleep disturbance may directly affect SC activities.
In human imaging, the SC responds to visual stimulation (Singh et al., 2018), and plays a key role in supporting spatial attention (Awh and Jonides, 2001; Jerde et al., 2012; Kasai and Isa, 2016; Katyal and Ress, 2013; Schneider and Kastner, 2009), and eye movement (Crapse et al., 2018; Grimaldi et al., 2018), target selection for goal-directed motor responses (Krauzlis et al., 2013; Merker, 2007), spatial working memory (Rahmati et al., 2020), and decision making (Basso et al., 2021; Basso and May, 2017). With its projections to brain stem motor nuclei, the SC supports innate behaviors (Furigo et al., 2010) and engages automatic attention to salient stimuli (Liddell et al., 2005; Mares et al., 2016; Nguyen et al., 2014; Rosa Salva et al., 2015; Wei et al., 2015). The SC is regulated “top-down” by cortical regions (Merker, 2013) in shifting from covert to overt attention (Sato et al., 2016) and integrating endogenous with externally drive attention (Katyal and Ress, 2014; Menon and Uddin, 2010; Mysore and Knudsen, 2014; Xuan et al., 2016). Studies in macaque monkeys showed that representations of visual priority emerge more rapidly in the SC than in primary visual cortex (White et al., 2017). Thus, the current findings of diminished SC activation during sustained attention in relation to sleep disturbance are consistent with this body of literature.
As with the SC, activation of the pulvinar was also negatively correlated with PSQI score. The pulvinar is the largest thalamic nucleus and supports cross-modal sensory processing and integration (Barron et al., 2015; Bourgeois et al., 2020) and other attentional processes (Bourgeois et al., 2020; Fiebelkorn and Kastner, 2020; Fiebelkorn et al., 2019; Gattass et al., 2018; Jaramillo et al., 2019; Stitt et al., 2018). The pulvinar is activated by the SC as well as directly by retinal inputs before visual signals reach cortical structures (Bridge et al., 2016; Diano et al., 2017). The most prominent ascending visual pathway to the inferior pulvinar passes through the superior colliculus (Bridge et al., 2016). Another study reported neurons in the visual pulvinar that relay signals from the SC to the medial temporal cortex for higher-order processing (Berman and Wurtz, 2010, 2011). Given the extensive roles of the SC and pulvinar in attentional control, it is likely that sleep disturbance will lead to this subcortical circuit dysfunction more broadly than described here for the visual relational task.
4.2. Alcohol misuse and cortical activation during visual relational processing
Although alcohol use severity did not appear to directly impact the performance in the relational task, the dorsomedial prefrontal cortex in the supplementary motor area (SMA) and pre-SMA, left inferior frontal cortex, and visual cortex showed higher activation in association with more severe alcohol use and prolonged RT. These regional activities were not related to the PSQI score, suggesting that they may reflect direct influences of chronic alcohol consumption on the brain. The higher activities may also indicate a functional compensatory process in these young adult participants.
4.3. Limitations and conclusions of the study
Some limitations should be noted for the study. First, the findings of mediation and path analyses only suggest directional influences. Whether or how alcohol consumption and sleep disturbance influence attentional performance via the SC, pulvinar and other cortical structures needs be verified experimentally. Second, although alcohol use severity varied significantly across individuals, the HCP data represent largely a non-clinical sample. Thus, how the current findings extend to addicted individuals needs to be examined. It is possible, for instance, that the direct effects of chronic alcohol consumption on the brain would be more severe as to mask the mediating roles of sleep disturbance. Third, PSQI scores varied across individuals and correlated positively with drinking severity; however, more objective measures of sleep quality may refine the current findings.
In conclusion, the current study extend the literature by establishing the neural processes relating alcohol misuse, sleep disturbance and attentional performance. In this population of young adult drinkers, the superior colliculus may play a crucial role in manifesting the effects of alcohol-related sleep disruption on visual attention deficits.
Supplementary Material
Funding Support and Acknowledgement
The current study is supported by National Key Research and Development Program of China No.2020YFC2007300, No. 2020YFC2007301 (XT) and NIH grants DA051922, AG072893 and AA021449 (C-SRL). Data were provided by the Human Connectome Project, WU-Minn Consortium (Principal Investigators: David Van Essen and Kamil Ugurbil; 1U54MH091657) funded by the 16 NIH Institutes and Centers that support the NIH Blueprint for Neuroscience Research; and by the McDonnell Center for Systems Neuroscience at Washington University.
Footnotes
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Competing interests
The authors declare that they have no competing interests.
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