title: Contextual determinants of anger and other negative expressions in young infants.
abstract: Two experiments examined how different frustration contexts affect the instrumental and emotional responses of 4- to 5-month-old infants. Three different frustrating contexts were investigated: loss of stimulation (extinction), reduction in contingent stimulation (partial reinforcement), and loss of stimulus control (noncontingency). In both experiments, changes in arm activity and facial expressions of anger and sadness coded according to the Maximally Discriminative Facial Movement Coding System (MAX) were the measures of frustration. Both experiments showed that (a) arm responses increased when the contingent stimulus was lost or reduced but decreased when control of the stimulus was lost under noncontingency, (b) MAX-coded anger, but not MAX-coded sad or blends of anger and sad, was associated with frustration, and (c) the pattern of anger and arm responses varied with the frustration context. When contingent stimulation was lost or reduced, both anger and arm responses increased, but when expected control was lost under noncontingency, arm responses decreased while anger increased.
authors.affiliation: Institute for the Study of Child Development, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, New Brunswick 08903-0019, USA. sullivan@umdnj.edu
authors.forename: Margaret W
authors.initials: MW
authors.lastname: Sullivan
authors.forename: Michael
authors.initials: M
authors.lastname: Lewis
mesh_terms: D000786:Anger; D005149:Facial Expression; D005260:Female; D005639:Frustration; D006801:Humans; D007389:Internal-External Control; D008297:Male; D009043:Motor Activity; D010553:Personality Development; D002666:Psychology, Child; D012055:Reinforcement Schedule; D012931:Social Environment