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Serrien, Deborah J.; Sovijärvi-Spapé, Michiel M.; Rana, Gita – Developmental Psychology, 2014
Manual dexterity is known to gradually progress with developmental age. In this study, we evaluate the performance of unimanual and bimanual actions under perturbed and unperturbed conditions in children between 4 and 10 years of age. Behavior was assessed by means of trajectory measurements and degree of bimanual coupling. The results showed that…
Descriptors: Psychomotor Skills, Motor Development, Young Children, Age Differences
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Deets, Allyn C. – Developmental Psychology, 1974
A study of the effect of the twin sibling relationship upon interactions between monkey mothers and infants. Findings provided strong support for the prediction that the twin sibling presence decreases the amount of behavior directed from infant to mother. Differences in maternal behavior were concluded to be reactions to differences in infant…
Descriptors: Animal Behavior, Behavior Patterns, Behavior Rating Scales, Behavioral Science Research