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Motor behaviors of neonatal rhesus monkeys: Measurement techniques and early development
Author(s) -
Castell Rolf,
Sackett Gene
Publication year - 1973
Publication title -
developmental psychobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 93
eISSN - 1098-2302
pISSN - 0012-1630
DOI - 10.1002/dev.420060303
Subject(s) - climbing , jumping , juvenile , jump , physical medicine and rehabilitation , psychology , developmental psychology , medicine , physiology , physics , biology , ecology , genetics , quantum mechanics
Abstract Development of newborn monkeys was assessed by 2 techniques. The 1st was a film analysis measuring aspects of walking, climbing, and jumping in mother‐reared infants. The 2nd used a “Baby‐Spin” apparatus consisting of a cloth covered bag which rotated in the vertical plane through 360°, 2 sec spins. Mother‐reared monkeys walked and climbed on Week 1 but did not jump until Week 3. The duration of arm and leg movements was constant, but because distance of movements changed the speed of limb movement increased over Weeks 1–5. Clasping and grasping responses were in synchrony from the first week of life. Clasping pressure to initial acceleration increased over the first 3 weeks, with greatest pressures at head‐down angles on Weeks 1 and 2, and a double‐peaked function, appearing on Weeks 3 and 4 with pressure maxima at both head‐down and head‐up angles. Developmental changes in clasping could be seen in longitudinal or cross‐sectional comparisons, or in comparisons confounded by effects of prior test experience.