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Peer reviewedSullivan, Margaret W.; Lewis, Michael – Developmental Psychology, 2003
Two experiments examined how different frustration contexts affect the instrumental and emotional responses of 4- to 5-month-olds. Both experiments showed that arm responses increased when the contingent stimulus was lost or reduced but decreased when control of the stimulus was lost under noncontingency. Facial expressions of anger, but not…
Descriptors: Anger, Context Effect, Contingency Management, Emotional Response
Download full textLewis, Michael; Gallas, Howard – 1976
This study examines the effects of sex, socioeconomic status, birth order and birth spacing on the cognitive performance of 12-week-old infants. A brief review of research on neonatal cognitive ability is followed by a description of the study itself. The subjects, 189 three-month-old Caucasian infants (61 first borns, 58 second borns, and 49…
Descriptors: Birth Order, Cognitive Development, Cognitive Measurement, Infant Behavior
