Stella
Chung
Sponsor: Erin Kinnally, Ph.D. Psychology Memory recognition is a key component within social behavior, allowing individuals to distinguish familiar from novel conspecifics. Nonhuman primates are ideal models for research, due to their complex social systems and neurobiology similar to humans. Age- related changes in novelty response across species suggests that older individuals have reduced novelty-seeking behaviors. We hypothesize that older macaques will show reduced preferential look toward novel conspecific faces compared to younger macaques. Novelty performance was assessed using a preferential look task. Subjects were familiarized with an image of a conspecific (20 second exposure), and then presented with a paired conspecific and novel stimuli during two 8 second test trials. 4 looking behaviors (Look Left, Look Right, Look Elsewhere, Out of View) were coded through BORIS from recorded videos to see the duration of gaze towards a novel versus familiar stimuli. A novelty preference will be computed and analyzed compared to age of the subjects. Analysis between age and novelty preference will be conducted using regression and ANOVA. The results of this study will clarify whether age is a factor in responsiveness to novelty. It will contribute to developmental psychology, by indicating memory recognition across lifespan and possibly cognitive change due to age. Scene structure efficiently guides attention in ADHD traits
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Authors:
Stella Chung
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Most visual search occurs in complex scenes, yet ADHD research has largely used simplified stimuli, finding similar or poorer performance in individuals with higher ADHD traits. However, scenes contain predictable semantic and spatial structure. Specifically, anchor objects (i.e., large objects like desks and tables) predict where smaller objects (e.g., mugs) are likely located. We examined how object-based visual search in scenes varies with ADHD traits. We hypothesized that individuals with higher ADHD traits would rely more on anchor-based search strategies and show larger spatial congruency effects. To test this, participants searched 40 scenes for a target object in congruent or incongruent anchor locations (N = 23). Participants then completed the Barkley Adult ADHD Rating Scale (BAARS-IV). Participants with higher ADHD traits showed faster reaction times and accuracy (both p < 0.020). Results also showed a larger congruency effect (p = 0.014), driven by better performance on congruent trials. Eye-tracking showed similar anchor fixation rates, but reduced anchor dwell time in high-ADHD participants (p = 0.045). These findings suggest that individuals with higher ADHD scores use probabilistic information about scene structure more rapidly. Overall, our research suggests that scene properties, specifically anchor objects, efficiently guide visual search in high- ADHD individuals. Application of GPCR-Based Fluorescent GRAB Sensors in Detecting Peptide Hormones Nicholas Chyu
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UC Davis / Psychology / 2026
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Co-authors:
Stella Chung