Hemispheric asymmetries of visual evoked potentials in relation to spatial frequency, handedness and familial left-handedness.
The effects of handedness and of familial left-handedness on the asymmetry of the cerebral hemispheres were investigated by means of visual evoked potentials. Square gratings of different spatial frequencies were presented, at 1 Hz in ON-OFF mode to 60 subjects: 30 right-handers and 30 left-handers, 15 with familial handedness and 15 without in each group. The results show that the patterns of hemispheric asymmetry differ in right- and left-handers. They also show that in left-handers these patterns depend on the presence or absence of familial left-handedness, whereas in right-handers the role of this genetic factor is less evident.
Rebaï
M
M
Laboratoire de Psy. Co., equipe de Neurophysiologie Sensorielle, Université de Rouen, Mt-St-Aignan, France.
Lannou
J
J
Bernard
C
C
Bonnet
C
C
Rochetti
G
G
D000293:Adolescent; D000328:Adult; D002540:Cerebral Cortex / Q000502:physiology*; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000235:genetics* / Q000502:physiology*; D006801:Humans; D008297:Male