Hand Preferences in Unimanual and Bimanual Feeding by Wild Vervet Monkeys (Cercopithecus aethiops )

Lateral preference was examined in spontaneous feeding actions in 2 troops of wild vervet monkeys ( Cercopithecus aethiops ). Processing of 4 foods (termites, leaf shoots, sugarcane, and fruit) was studied. Actions included unimanual reaching to moving objects, operating from an unstable posture, an...

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Bibliographic Details
Published in:Journal of comparative psychology (1983) 2000-03, Vol.114 (1), p.13-21
Main Authors: Harrison, Kathryn E, Byrne, Richard W
Format: Article
Language:English
Subjects:
Age Differences
Animal
Animal Feeding Behavior
Animal Sex Differences
Animals
Animals, Wild
Cercopithecus aethiops - psychology
Choice Behavior
Feeding Behavior
Female
Food Preferences - psychology
Functional Laterality
Handedness
Injuries
Lateral Dominance
Male
Monkeys
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Summary:Lateral preference was examined in spontaneous feeding actions in 2 troops of wild vervet monkeys ( Cercopithecus aethiops ). Processing of 4 foods (termites, leaf shoots, sugarcane, and fruit) was studied. Actions included unimanual reaching to moving objects, operating from an unstable posture, and coordinated bimanual processing. Between 19 and 31 subjects were available, according to the task. In 2 tasks, laterality of 2 independent stages was measured separately, giving 6 measures in all. On 4 of these measures, most monkeys were ambipreferent, and only a few showed significant hand preferences. Only for termite feeding and detaching material from fruits did the majority show significant lateralization; no tasks elicited exclusive use of 1 hand. Preference appeared labile, because in 2 tasks, population trends reversed with increasing age. No population trends to left or right were found; instead, these monkeys showed ambilaterality, with lateralization associated with task complexity.
ISSN:0735-7036
1939-2087
DOI:10.1037/0735-7036.114.1.13