How do our brains respond when we are being watched by a group of people?Despite the large volume of literature devoted to face processing, this question has received very little attention. Here we measured the effects on the face-sensitive N170 and other ERPs to viewing displays of one, two and three faces in two experiments. In Experiment 1, overall image brightness and contrast were adjusted to be constant, whereas in Experiment 2 local contrast and brightness of individual faces were not manipulated. A robust positive-negative-positive (P100-N170-P250) ERP complex and an additional late positive ERP, the P400, were elicited to all stimulus types. As the number of faces in the display increased, N170 amplitude increased for both stimulus sets, and latency increased in Experiment 2. P100 latency and P250 amplitude were affected by changes in overall brightness and contrast, but not by the number of faces in the display per se. In Experiment 1 when overall brightness and contrast were adjusted to be constant, later ERP (P250 and P400) latencies showed differences as a function of hemisphere. Hence, our data indicate that N170 increases its magnitude when multiple faces are seen, apparently impervious to basic low-level stimulus features including stimulus size. Outstanding questions remain regarding category-sensitive neural activity that is elicited to viewing multiple items of stimulus categories other than faces.

Facial movements have the potential to be powerful social signals. Previous studies have shown that eye gaze changes and simple mouth movements can elicit robust neural responses, which can be altered as a function of potential social significance. Eye blinks are frequent events and are usually not deliberately communicative, yet blink rate is known to influence social perception. Here, we studied event-related potentials (ERPs) elicited to observing non-task relevant blinks, eye closure, and eye gaze changes in a centrally presented natural face stimulus. Our first hypothesis (H1) that blinks would produce robust ERPs (N170 and later ERP components) was validated, suggesting that the brain may register and process all types of eye movement for potential social relevance. We also predicted an amplitude gradient for ERPs as a function of gaze change, relative to eye closure and then blinks (H2). H2 was only partly validated: large temporo-occipital N170s to all eye change conditions were observed and did not significantly differ between blinks and other conditions. However, blinks elicited late ERPs that, although robust, were significantly smaller relative to gaze conditions. Our data indicate that small and task-irrelevant facial movements such as blinks are measurably registered by the observer's brain. This finding is suggestive of the potential social significance of blinks which, in turn, has implications for the study of social cognition and use of real-life social scenarios.

In sport, aggressive behavior is a potentially harmful byproduct of uncontrolled anger. In addition, it is known that provocation can lead to both anger and aggressive retaliation. However, despite the potential consequences of aggressive behavior, little is known about levels of competitive anger and aggressiveness in athletes, and it is unclear if differences exist by gender or type of sport. Little research has also explored intervention approaches to help athletes better manage anger and aggression. Therefore, the purpose of this study was to explore competitive aggressiveness, anger, and the experience of provocation among collegiate athletes. Participants were 243 male and female contact or collision sport athletes competing at NCAA Division I, II, and III universities across the country. Participants filled out questionnaires assessing both competitive aggressiveness and anger and the experience of provocation. Overall, it was found that male athletes scored significantly higher than female athletes on competitive aggressiveness, as well as experiencing more frequent provocative behavior and more negative and intense responses to provocation. Collision sport athletes were also found to be higher in competitive aggressiveness and anger, regardless of gender. Division I and II athletes were found to be significantly higher than Division III athletes in competitive aggressiveness and anger.

Thank you to the rest of the faculty and students in the WVU Sport & Exercise Psychology program for their support, especially my fellow cohort member Leigh Bryant for her encouragement, positivity, and friendship since day one. I also want to thank my roommate Pete Kadushin for helping me to see the light at the end of the tunnel at crucial times during this process. Last but certainly not least, thank you to my parents, brothers, and wonderful fiancé for their unwavering love and support both in the thesis process and in life.