Lateral bias in feeding and brachiation inHylobates |
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Authors: | Donna K Stafford Garrett W Milliken Jeannette P Ward |
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Institution: | (1) Department of Psychology, Memphis State University, 38152 Memphis, Tennessee, U.S.A. |
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Abstract: | Lateralized hand use in gibbons was assessed for both food reaching and leading limb in brachiation. Sex and age effects were
found in hand preference for food reaching. Adult females were all very strongly right hand preferent, whereas adult males
had no across group consistent preference. Within the female group there was a strong correlation between age and strength
of right handedness. When compared in terms of absolute strength of hand preference, females were found to be more strongly
lateralized than males. Leading limb preference in brachiation was scored into vocal and non-vocal categories. Three subjects
had a shift in preferred leading limb from the non-vocal brachiation condition to the vocal brachiation condition. This shift
may be influenced by the arousal effects of species typical vocalization. The results of this study underline the importance
of consideration of such factors as sex and age when interpreting behavioral lateralization data. The exploration of laterality
in many different response measures is important to the achievement of a complete understanding of behavioral lateralization
in primates. |
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Keywords: | Hylobatid Laterality Sex difference Brachiation Handedness |
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