Abstract
A substantial body of research has assessed the effect of gender on face recognition; however, little is known about the effect of relationship status on face recognition. In this study, we assessed for the first time how relationship status impacts face recognition by asking 62 male and female participants to decide whether they had previously encountered faces of males and females. Participants were also asked to fill a socio-demographic variables questionnaire which included, among other information, question about their relationship status (i.e., single vs. in a relationship). A significant effect of relationship status on face recognition was observed only in males; namely, single males demonstrated higher face recognition than males in relationships, whereas similar face recognition was observed in single and in-relationship females. More specifically, single males demonstrated higher recognition for female than for male faces, whereas no differences were observed in single females, males in relationships, or in females in relationship. Single males seem to be motivated by mating opportunity and, thus, unlike single females or males and females in relationships, devote high attentional resources to processing faces of the opposite gender.
Keywords: face recognition, gender differences, evolutionary theory, relationship status
Introduction
Face processing is a crucial social cognitive ability. Unsurprisingly, substantial literature has been devoted to this topic. Like many other cognitive abilities, face processing has been found to be influenced by gender, as reported in a numerous studies (Caplan, Crawford, Hyde, & Richardson, 1997; Halpern, 2000; Kimura, 1999; Sommer, Hildebrandt, Kunina-Habenicht, Schacht, & Wilhelm, 2013; Voyer, Voyer, & Bryden, 1995). There is, for instance, evidence that males are better than females at performing visuo-spatial working memory tasks (for a review, see Cornoldi & Vecchi, 2004). In contrast, studies suggest that females are better than males at performing a variety of verbal episodic memory tasks (for a review, see Ullman, Miranda, & Travers, 2008). The superiority of females in verbal processing has been also observed for autobiographical memory, that is, memory for personal experiences (Conway, 2005; Rubin, Schrauf, & Greenberg, 2003). For instance, studies have reported that females often describe autobiographical events with more details (Grysman, 2017; Nahari & Pazuelo, 2015) including basic factual details (Grysman, Merrill, & Fivush, 2016).
Interestingly, some studies suggest that females outperform males in tasks involving face recognition, independent of face age and ethnicity (Herlitz & Lovén, 2013; Herlitz, Reuterskiold, Loven, Thilers, & Rehnman, 2013; McBain, Norton, & Chen, 2009; Rehnman & Herlitz, 2006, 2007). The advantage of females in face recognition can be attributed to better perception of emotional expressions. Females are better at recognizing and interpreting emotional facial expressions, a difference already apparent in infancy (McClure, 2000). There is also evidence that, on an attentional level, females process faces faster and more efficiently than males (Bowles et al., 2009; Godard & Fiori, 2010, 2012; Megreya, Bindemann, & Havard, 2011; Sommer et al., 2013). In a similar vein, infant girls spend more time looking at faces than boys do (Connellan, Baron-Cohen, Wheelwright, Batki, & Ahluwalia, 2000). The advantage of females in face processing can be significantly observed specifically for female faces: Research suggests that females perform at a higher level for female faces than for male faces (Cross, Cross, & Daly, 1971; Lewin & Herlitz, 2002; Wright & Sladden, 2003). The advantage of females in face processing in general can also be attributed to a general greater interest and knowledge of social aspectsof the world (Kaplan, 1978; Rehnman & Herlitz, 2007). Finally, the advantage females have in processing of female faces perhaps reflects the fact that that females’ social interest is specifically directed towards other females (Loven, Herlitz, & Rehnman, 2011).
Besides gender differences, face recognition may be impacted by relationship status (i.e., single vs. in a relationship). Single individuals may be more motivated by mating interest, and consequently, be more oriented toward the opposite gender than individuals in relationships. Accordingly, single individuals may be specifically interested in processing and retaining physical attributes (e.g., faces) related to the opposite gender. This proposal is in agreement with the derogation effect, that is, the observation that single individuals tend to rate the attractiveness of opposite-gender individuals as higher than individuals in relationships (Karremans, Dotsch, & Corneille, 2011; Lydon, Meana, Sepinwall, Richards, & Mayman, 1999; Ritter, Karremans, & van Schie, 2010; Simpson, Gangestad, & Lerma, 1990). Support for the effect of relationship status on face processing can also be found in studies demonstrating that single individuals pay more attention to opposite-gender individuals than do individuals in relationships (Maner, Gailliot, & Miller, 2009; Maner, Gailliot , Rouby, & Miller, 2007; Maner, Miller, Moss, Leo, & Plant, 2012; Maner, Rouby, & Gonzaga, 2008). More specifically, Maner et al. (2009) found that whereas single participants increased implicit attention to physically attractive opposite gender targets, participants in relationships were inattentive to such stimuli.
The potential effect of relationship status on face processing can be also understood in light of studies on mating motivations. Confer, Perilloux, and Buss (2010) asked participants to consider dating, in short- or long-term, an opposite gender individual whose face and body were hidden, respectively, by a “face box” and a “body box”. Participants were instructed that only one box could be removed to make their mating decision. Results showed that men prioritized facial cues in long-term mating contexts, but shift their priorities toward bodily cues in short-term mating contexts, whereas females prioritized facial cues over bodily cues regardless of the mating context. Similar findings were observed by Lu and Chang (2012) who found that when considering short- rather than long-term mating contexts, males' attention was significantly influenced by the waist/hip area rather than the face on photographs of attractive women. In contrast, females did not demonstrate such an influence in response to photographs of attractive men. Lu and Chang (2012) argue that perceptual attention in males has evolved to selectively process reproductive information about the opposite gender as a function of short- versus long-term mating goals. The effect of the mating context on face recognition was also reported by Wagstaff, Sulikowski, and Burke (2015), who observed that when prompted for a short- rather than a long-term relationship, male participants showed an increase in their preference for looking at female bodies rather than faces, whereas female participants did not show this difference and generally preferred to look at male faces. Together, research suggests that females’ perception of males’ faces is not context-dependent, whereas males seem to show a bias toward low processing of females’ faces when considering a short-term mating context. Importantly, none of these studies have considered the participants’ relationship status.
To summarize, while there is a body of evidence suggesting gender differences in memory for faces, little is known about the effect of relationship status on this type of memory. Our study addressed this issue by assessing face recognition in single versus. in-relationship male and female participants. Regardless of their relationship status, based on literature suggesting female superiority in face recognition (Herlitz & Lovén, 2013; Herlitz et al., 2013; McBain et al., 2009; Rehnman & Herlitz, 2006, 2007), we expected to find superior face recognition in female participants. We also expected a higher face recognition accuracy for the opposite gender faces in single participants, especially single males, than in participants in relationships.
Method
Participants
Sixty-two native French speaker students at the University of Lille participated in the study (32 females and 30 males, Mage = 23.06, SD = 4.95). At the beginning of the experiment, participants completed a form about their age, gender, relationship status (i.e., single vs. in a relationship), occupation, and history of psychiatric or neurological disorders. We excluded six participants with psychiatric/neurological disorders from the original sample (N = 68). We also excluded participants who performed two SDs below the mean score on the episodic memory task by Grober and Buschke (1987). On this task, participants had to remember 16 words, each describing an item belonging to a different semantic category; after a 20 s distraction phase, they had to recall as many words as they could; the maximum score is 16 points. The mean score of participants was 12.34 (SD = 3.13).
Procedures
Participants were informed in advance that they had to retain faces for a later recognition task (for a similar use of intentional encoding in face recognition, see Golby, Gabrieli, Chiao, & Eberhardt, 2001; Rehnman & Herlitz, 2007). However, in order not to interfere with the relationship status variable, no mention of it was made in the instructions. In line with studies on face recognition (Rehnman & Herlitz, 2006), our task included 48 colored faces, taken from the FACES database (Ebner, Riediger, & Lindenberger, 2010), including 24 male and 24 female faces aged from 18 to 25 years old. This age interval was chosen to control for any potential own age bias, that is, the fact that young participants perform worse in recognizing older than young adult faces (Rhodes & Anastasi, 2012). In the FACES database, faces had similar size, lighting conditions, and orientation. All faces depicted neutral expressions, so as to control for any potential effect of emotion on recognition (El Haj, Antoine, & Nandrino, 2016; El Haj, Fasotti, & Allain, 2015; El Haj, Raffard, Antoine, & Gely-Nargeot, 2015).
Table 1.

Distribution of Participants According to Gender and Relationship Status
The task was designed with the Psychopy (Peirce, 2007) software package. We used a Dell laptop computer with a 15 in. LCD display. The task included an encoding, an interpolated, and a recognition phase. On the encoding phase, each of 24 pictures (12 males + 12 females) was presented for 1 s (interstimulus interval: 1 s). The encoding phase was followed by the interpolated phase (implemented to prevent reliance on immediate memory) in which participants had to read aloud strings of three-digit numbers for one minute. Afterward, participants proceeded to the recognition phase, in which 48 pictures were presented (the previous 24 pictures + 24 distractors). Pictures were randomly presented, with no time constraint. For each picture, participants responded whether it was presented in the previous phase by pressing a green key or whether it was new by pressing alarms), as recommended for analyzing recognition memory (Snodgrass & Corwin, 1988).
Results
We first compared the number of single participants and participants in relationships in the two gender groups. We then compared recognition scores for female and male faces according to the gender and relationship status of our participants. We also compared episodic memory scores according to the participants’ gender and relationship status, so as to control whether any potential gender/relationship status differences would be observed in face recognition only or in episodic memory in general. For all tests, the level of significance was set at p ≤ .05
Similar Distribution of Relationship Status
The distribution of the participants according to their gender and relationship status is depicted in Table 1. Chi square test showed no significant differences between single participants and participants in relationships in the two gender groups, χ2(1, N = 62) = .22, p > .10.
High Recognition for Female Faces in Single Males
We conducted a repeated-measures analysis of variance (ANOVA) using recognition scores (depicted in Figure 1), the participants’ gender (male vs. female) and their relationship status (single vs. in a relationship) as the between-participants factors and the gender of faces (male vs. female) as the repeated-measure factor. Analyses showed a significant effect of participant gender, F(1, 58) = 28.92, p < .001, η2 = .33. Female participants showed higher face recognition than male participants, with respective means of .80 (SD = .17) and .58 (SD = .22). The effect of relationship status was also significant, F(1, 58) = 21.42, p < .001, η2 = .27. Further, single participants showed higher face recognition than participants in relationships, with respective means of .78 (SD = .17) and .59 (SD = .23). The interaction between participant gender and their relationship status was significant, F(1, 58) = 4.79, p < .05, η2 = .08. Higher face recognition was observed in single males than in males in relationships, t(28) = 4.71, p < .001, with respective means of .72 (SD = .15) and .43 (SD = .17). However, no significant differences were observed between single females and females in relationships, t(30) = 1.68, p > .1. Higher face recognition was also observed in single females than in single males, t(23) = 2.17, p < .05, with respective means of .85 (SD = .15) and .72 (SD = .15). Higher face recognition was also observed in females than males in relationships, t(35) = 5.76, p < .001, with respective means of .75 (SD = .16) and .43 (SD = .17). The effect of face gender was significant, F(1, 58) = 3.92, p < .05, η2 = .11. Higher recognition was observed for female than for male faces, with respective means of .74 (SD = .28) and .64 (SD = .26); this effect was, however, observed only in female participants, t(31) = 2.11, p < .05, with respective means of .84 (SD = .20) and .73 (SD = .23). The interaction between relationship status and face gender was significant, F(1, 58) = 3.95, p < .05, η2 = .12. Single participants demonstrated higher recognition for female faces than for male faces, t(24) = 2.85, p < .01, with respective means of .87 (SD = .17) and .69 (SD = .26), whereas participants in relationships demonstrated similar recognition for both female and male faces, t(33) = .65, p > .10. Finally, the interaction between participant gender, their relationship status, and face gender was significant, F(1, 58) = 3.89, p < .05, η2 = .09.Single males demonstrated higher recognition for female than for male faces, t(12) = 2.49, p < .05, with respective means of .83 (SD = .20) and .60 (SD = .25). However, similar recognition was observed in single females and in females and males in relationships.
Similar Episodic Memory in Single Participants and Participants in Relationships
Episodic memory scores, as obtained on the task by Grober and Buschke (1987), are depicted in Table 2. We conducted a 2 × 2 (Participant Gender [females, males] × Relationship Status [ single, in a relationship]) ANOVA on these scores. Analyses showed a significant effect of gender, F(1, 58) = 4.11, p < .05, η2 = .07, females showed higher episodic memory than males, with respective means of 12.84 (SD = 2.83) and 11.33 (SD = 3.15). All remaining effects were not statistically significant.
Figure 1.

Recognition of female and male faces according to the participants’ gender and relationship status. Error bars represent intervals of 95 % within-subjects confidence.
Discussion
This study investigated the effect of gender and relationship status on face recognition. Our analyses showed higher face recognition in female than in male participants, regardless of their relationship status. A significant effect of relationship status on face recognition was observed only in males; specifically, single males demonstrated a higher face recognition than males in relationships, whereas similar face recognition was observed in single females and females in relationships. More specifically, single males demonstrated higher recognition for female than for male faces, whereas no differences were observed in single females and both females and males in relationships. In addition, higher episodic memory was observed in female than in male participants, whereas no significant effect of relationship status was observed on episodic memory. Together, relative to males in relationships, single males demonstrated higher face recognition, especially for female faces, but similar episodic memory, whereas females demonstrated similar face recognition and episodic memory regardless of their relationship status.
Our findings replicate prior studies with regard to (a) higher general face recognition and episodic memory in female participants and (b) the own-gender bias in female participants, that is, the fact that these participants demonstrated higher recognition for female than for male faces. The finding of a higher general face recognition in these participants mirrors studies demonstrating that females outperform males in tasks involving face recognition, independent of face age and ethnicity (Herlitz & Lovén, 2013; Herlitz et al., 2013; McBain et al., 2009; Rehnman & Herlitz, 2006, Rehnman & Herlitz, 2007). This finding also mirrors research demonstrating that females are better at recognizing and interpreting emotional facial expressions (McClure, 2000) as that infant girls spend more time looking at faces than boys (Connellan et al., 2000). The advantage females have in face processing has been attributed to a general greater interest in and knowledge of social aspects of the world (Kaplan, 1978; Kimura, 1999; Rehnman & Herlitz, 2007).
As for the high verbal episodic memory in our female participants, studies suggest females tend to outperform males when the memory material is verbal (Astur, Ortiz, & Sutherland, 1998; Lewin, Wolgers, & Herlitz, 2001; Ruff, Light, & Quayhagen, 1989; Ullman et al., 2008). This advantage is illustrated by a study in which females and males were tested on a series of tasks involving the recall and recognition of verbal material and abstract pictorial stimuli (Herlitz & Yonker, 2002). Herlitz and Yonker (2002) found that females outperformed males on memory of verbal materials. The superiority of females in verbal processing has been also observed for autobiographical memory (Grysman, 2017; Grysman et al., 2016; Nahari & Pazuelo, 2015). Since our episodic memory task implied processing verbal information, it is not surprising that female participants in our study have outperformed male participants. With regard to the own-gender bias in female participants, research suggests that females perform at a higher level on female than male faces (Cross et al., 1971; Lewin & Herlitz, 2002; Wright & Sladden, 2003). In contrast, males do not appear to show a corresponding own-gender bias for male faces. Several studies have found that males perform at a similar level for both male and female faces (Cross et al., 1971; Ino, Nakai, Azuma, Kimura, & Fukuyama, 2010; Lewin & Herlitz, 2002; Loven et al., 2011;Megreya et al., 2011; Wright & Sladden, 2003), mirroring the performance of male participants in our study. The own-gender bias, as observed in females, has been interpreted as reflecting the fact that females’ greater social interest is specifically directed towards other females (Loven et al., 2011). According to another social account, females may be more interested in female than in male faces due to the high value placed by society on female attractiveness (Cross et al., 1971; Ellis, Shepherd, & Bruce, 1973). Taken together, our findings replicate previous studies with regard to the higher general face recognition and episodic memory in female participants, as well as with regard to their own-gender bias.
Table 2.

Episodic Memory Scores of Participants According to Gender and Relationship Status
Compared to other investigations of face recognition, the originality of our study lies in the assessment of relationship status. Our findings demonstrate higher face recognition in single females than in single males, as well as in females in relationships than males in relationships. Accordingly, regardless of their relationship status, females seem to outperform males on face recognition. The main finding of our paper was the high face recognition in single male participants, especially for female faces. Female participants, on the other hand, demonstrated similar face recognition regardless of their relationship status or the gender of faces. In our view, single males are specifically motivated by mating opportunity, and thus, tend to pay more attention to features of the opposite gender than single females do. On the other hand, individuals in relationships may benefit from affective and emotional comfort and stability, decreasing their motivation to process physical features of the opposite gender, which may explain why similar face recognition was observed in our female and male participants in relationships.
This suggestion is supported by studies demonstrating that while single individuals increase implicit attention to physically attractive opposite gender targets, individuals in relationships are inattentive to such stimuli (Maner et al., 2009; Maner et al., 2008). Our assumption is additionally supported by the individuation motivation account (Hugenberg, Wilson, See, & Young, 2013), which states that individuals essentially process faces considered worthy of their attention. More specifically, enhanced motivation triggers selective attention (and deeper processing), which can facilitate face encoding. This model is supported by research demonstrating bias toward low processing of female faces when males consider a short-term mating strategy (Confer et al., 2010; Lu & Chang, 2012; Wagstaff et al., 2015). Even though the individuation motivation account does not take into account the effect of relationship status, it does, however, provide support to the assumption that single males are motivated by mating opportunity, resulting in high memory for females faces.
The effect of motivation on face processing in single males can also be interpreted from an evolutionary perspective. According to one evolutionary account, humans possess fundamental social motives shaped by natural selection to produce behaviors that increase reproductive fitness (Kenrick, Neuberg, Griskevicius, Becker, & Schaller, 2010). Interestingly, mate-related motives have been considered as one of fundamental social motives that exert important effects on social behaviors (Griskevicius, Cialdini, & Kenrick, 2006; Karremans et al., 2011; Lydon et al., 1999; Maner et al., 2007; Maner et al., 2012; Ritter et al., 2010). Further, attention is the first step in information processing and in memory, and its evolutionary function is mainly related to information relevant to survival and reproductive goals (Dunbar & Barrett, 2007), siven the limited attentional capacity and the diverse and complex social information that surrounds us. Hence, this attentional selectivity may result in high processing of female faces in single males. Single females, on the other hand, do not seem to demonstrate such an attentional bias, probably due to their enhanced overall memory for faces. That is, they process faces faster and more efficiently than males (Bowles et al., 2009; Godard & Fiori, 2010, 2012; Megreya et al., 2011; Sommer et al., 2013), or they simply do not seek mating opportunities as much as males do.
One limitation of our study is the small sample size, which increases the risk of Type II statistical errors. Another is that we did not consider the duration of the relationship status of our participants. Future studies should take into account the duration of relationship as individuals in recently established relationships or those in open relationships may have high mating motivation, and thus, may demonstrate high face recognition. Another suggestion for future research is to explore face recognition according to sexual orientation, as single homosexual individuals may demonstrate higher face recognition for the same rather than for the opposite gender. Finally, it would be of interest to take response time into account, as this variable may provide better insight into participants’ performance. This issue is important because accuracy measures may not reflect attentional processes by themselves. By addressing these limitations, future research may provide a comprehensive picture of the effect of relationship status on face recognition. Regardless of its potential limitations, this study shows, for the first time, that relationship status does impact face recognition and not episodic memory in general.
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