Multitask analysis of cerebral hemisphere specialization in monozygotic twins discordant for handedness.
This study constitutes a multitask appraisal of cerebral hemisphere specialization with 13 monozygotic (MZ) twin pairs discordant for handedness. Tasks included dichotic listening, finger tapping with concurrent loads, two tachistoscopic visual half-field tests, and a free-vision face test. Overall, MZ twins showed similar performance asymmetries on most tasks. Different asymmetries, however, were observed on the finger tapping with anagram load and visual half-field with chair stimuli. In these instances, asymmetries for left- and right-handed MZ twins were more similar to patterns reported in the literature for left- and right-handed singletons, respectively, than for opposite-handed co-twins.
Department of Psychology, California State University, Fullerton 92634, USA. DKEE@Fullerton.edu
D W
DW
Kee
B J
BJ
Cherry
P L
PL
Neale
D M
DM
McBride
N L
NL
Segal
D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D002540:Cerebral Cortex / Q000502:physiology*; D004292:Dominance, Cerebral / Q000235:genetics / Q000502:physiology; D005149:Facial Expression; D005260:Female; D007839:Functional Laterality / Q000235:genetics / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009048:Motor Skills / Q000502:physiology; D009483:Neuropsychological Tests; D010364:Pattern Recognition, Visual / Q000502:physiology; D011340:Problem Solving / Q000502:physiology; D011932:Reading; D012938:Social Perception; D013067:Speech Perception / Q000502:physiology; D014430:Twins, Monozygotic; D014705:Verbal Behavior / Q000502:physiology; D014794:Visual Fields / Q000502:physiology