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10Multiracial emerging adults navigate unique challenges in diverse social contexts influenced by their phenotypic characteristics and perceived race. This study collected interviews of 30 multiracial individuals to explore how social settings shape their racial identities and experiences. Thematic analysis revealed themes of misidentification, cultural expectations, and white privilege. Participants reported navigating conflicting social expectations, grappling with privilege, and feeling disconnected in monoracial spaces. Findings highlight the need for inclusive programs to address multiracial identity complexities.POSTER 46NEURAL REACTIVITY TO FACIAL GESTURES IN 6-TO 9-WEEK-OLDS: COMPARING EEG PREPROCESSING PROCEDURESKELSEY DAVINSON (UNIVERSITY OF CONNECTICUT), LAUREN J BRYANT (SACRED HEART UNIVERSITY), ROSS VANDERWERT (CARDIFF UNIVERSITY), KIMBERLY CUEVAS (UNIVERSITY OF CONNECTICUT) One challenge to studying emerging neural activity in the context of dyadic facial interactions in very young infants has been limited amounts of useable data. This study reprocessed traditional, manually-edited EEG data from 2-month-olds with an automateddevelopmental pipeline for low-density EEG. We focus on data retention, artifact rejection, and signal quality metrics. Findings will inform ways to enhance efficiency, standardization, and data quality for 2-month-olds' EEG data collection in ecologically relevant contexts.POSTER 47NUMERICAL COGNITION IN MANDARINSPEAKING & ENGLISH-SPEAKING 2-TO-4-YEAROLD CHILDRENYINTAO KANG (TEACHERS COLLEGE, COLUMBIA UNIVERSITY), LUXIN ZHANG (TEACHERS COLLEGE, COLUMBIA UNIVERSITY), HUANYI YE (TEACHERS COLLEGE, COLUMBIA UNIVERSITY), YUEXIN LI (TEACHERS COLLEGE, COLUMBIA UNIVERSITY), JUN FU (TEACHERS COLLEGE, COLUMBIA UNIVERSITY), JENNIFER CHEN (TEACHERS COLLEGE, COLUMBIA UNIVERSITY), HUIQI MENG (TEACHERS COLLEGE, COLUMBIA UNIVERSITY), JEAN EE TANG (TEACHERS COLLEGE, COLUMBIA UNIVERSITY), PETER GORDON (TEACHERS COLLEGE, COLUMBIA UNIVERSITY) This study investigates the numerical cognition development among 24- to 60-months-old Mandarinspeaking children, using a battery of verbal and nonverbal tasks validated in prior research. Data analysis revealed that Mandarin-speaking children performed similarly to English-speaking children across most tasks but showed stronger performance on certain tasks. These findings suggest that numerical cognition development is largely comparable across languages, with some differences influenced by linguistic structure.POSTER 48OBSERVING YOUNG CHILDREN IN NATURAL SETTINGSJULIA KLIMBERG (TUFTS UNIVERSITY), MARTHA POTT (TUFTS UNIVERSITY), MARY CASEY (TUFTS UNIVERSITY) This study explored strategies young children use to regulate emotions, engage peers in play, and distribute social roles. Observations of 80 children aged 3%u20137 revealed that children regulated emotions through selfsoothing, seeking help, or controlling distressing situations. Peer engagement strategies involved invitations, spontaneous joining, or onlooker behavior. During play, one child assigned roles, or each child claimed a role. Findings provide insight in how best to support the emotional and social development of young children.POSTER 49PARENTAL DIFFERENTIAL TREATMENT AND PERSONALITY TRAITS ACROSS BIRTH ORDERHAMIDE GOZU (THOMAS JEFFERSON UNIVERSITY) Previous research has extensively examined the link between birth order and personality, as well as the link between parental differential treatment and personality, although these studies point to inconsistent findings. This study investigated the curvilinear relationships between parental differential treatment and personality traits, considering the role of birth order. Regression analyses of 316 college students indicated that parental differential affection and control curvilinearly predict personality traits, with these relationships varying based on participants' birth order. POSTER 50PARENTAL MENTAL HEALTH, PARENTING STYLE, AND CHILD DEVELOPMENT FOLLOWING NICU HOSPITALIZATIONDANIELLE LA CAMERA (MASSACHUSETTS GENERAL HOSPITAL), VICTORIA GRUNBERG (MASSACHUSETTS GENERAL HOSPITAL) We examined parental mental health, parenting style, and child behavioral and social development two years after a Neonatal Intensive Care Unit (NICU) hospitalization. Despite baby medical severity, parental 10