Functional significance of individual variations in callosal area.
We considered the hypothesis that the richness of callosal interhemispheric connections has a role in determining the degree of behavioural laterality and time-sharing ability in dual-task performance. Behavioural laterality as measured by dichotic word listening, line bisection and turning bias tests correlated inversely with the midsagittal cross-sectional area of the corpus callosum, as seen on MRI. The amount of dual task interference was strongly inversely correlated with the callosal area in both within-hemisphere and between-hemispheres conditions. These relationships between normal variations in callosal area, and outcomes on tests both of laterally and time-sharing capacity in normal adults suggest that the corpus callosum assumes a cross-excitatory role when subjects perform these tasks.
Yazgan
M Y
MY
Child Study Center, Yale University School of Medicine, New Haven, Connecticut, USA.
Wexler
B E
BE
Kinsbourne
M
M
Peterson
B
B
Leckman
J F
JF
D000328:Adult; D001307:Auditory Perception / Q000502:physiology; D003337:Corpus Callosum / Q000502:physiology*; D004007:Dichotic Listening Tests; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007206:Individuality; D008279:Magnetic Resonance Imaging; D008297:Male; D009949:Orientation / Q000502:physiology; D013647:Task Performance and Analysis; D014796:Visual Perception / Q000502:physiology