TY - JOUR
T1 - Sex and handedness effects on corpus callosum morphology in chimpanzees (Pan troglodytes)
AU - Dunham, Leslie A.
AU - Hopkins, William D.
PY - 2006/10
Y1 - 2006/10
N2 - Findings suggest that in humans, sex and hand preference may be associated with the size of the corpus callosum (CC). The authors measured CC morphology from MRIs in 67 chimpanzees (Pan troglodytes) to see whether similar effects were present in this species. Hand preference was assessed by performance on 4 tasks, and chimpanzees were classified as left-handed, right-handed, or ambidextrous. In a subsequent analysis, the chimpanzees were reclassified into 2 groups: right-handed and left-handed. The results revealed no sex difference in CC area, but significant effects of hand preference were found for several CC regions (rostrum body, anterior midbody, posterior midbody, isthmus, and splenium) and for overall CC size, with left-handed chimpanzees exhibiting significantly smaller CC measurements than right-handed chimpanzees. The results indicate that lateralized hand use in chimpanzees, as in humans, is associated with variation in CC size.
AB - Findings suggest that in humans, sex and hand preference may be associated with the size of the corpus callosum (CC). The authors measured CC morphology from MRIs in 67 chimpanzees (Pan troglodytes) to see whether similar effects were present in this species. Hand preference was assessed by performance on 4 tasks, and chimpanzees were classified as left-handed, right-handed, or ambidextrous. In a subsequent analysis, the chimpanzees were reclassified into 2 groups: right-handed and left-handed. The results revealed no sex difference in CC area, but significant effects of hand preference were found for several CC regions (rostrum body, anterior midbody, posterior midbody, isthmus, and splenium) and for overall CC size, with left-handed chimpanzees exhibiting significantly smaller CC measurements than right-handed chimpanzees. The results indicate that lateralized hand use in chimpanzees, as in humans, is associated with variation in CC size.
KW - Animal gender
KW - Corpus callosum
KW - Handedness
KW - Pan troglodytes
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U2 - 10.1037/0735-7044.120.5.1025
DO - 10.1037/0735-7044.120.5.1025
M3 - Article
C2 - 17014254
AN - SCOPUS:33750137470
SN - 0735-7044
VL - 120
SP - 1025
EP - 1032
JO - Behavioral Neuroscience
JF - Behavioral Neuroscience
IS - 5
ER -