title: Age differences in intensity of emotional expression between younger and older infants.
abstract: Age differences in the intensity of emotional expression of infants ages 7 to 8 months were compared to those ages 9 through 13 months. All 82 participants (33 boys, 49 girls) were prescreened for normal development. Participants were each presented with a randomized order of 12 stimuli (peek-a-boo, still face, stranger approaches, toy bug, toy taken, parent leaves, toy switch, puppets, toy out of reach, squeaky toy, jack-in-the-box, and loud noise). Emotional responses were video recorded and analyzed. Intensity of emotional expression was measured on an ordinal scale (PEEX: Parameters of Emotional Expression) incorporating MAX facialcodes and vocal and bodily items from Lab-Tab. Coding was analyzed for reliability. Older infants were significantly more intense in their emotional expressions than younger infants.
authors.affiliation: Psychology Department, Salisbury University, 1101 Camden Avenue, Salisbury, MD 21810, USA. melosonczy@salisbury.edu
authors.forename: Marta E
authors.initials: ME
authors.lastname: Losonczy-Marshall
mesh_terms: D000339:Affect; D003071:Cognition; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male