Asymmetry of the visual evoked potentials of stimuli presented in different halves of the field and in the centre of the field.
Visual evoked potentials of nonverbal stimuli presented in the left or right visual fields, or verbal stimuli presented in the centre of the field, were studied in ten healthy right-handed subjects. The study comprised the following three series: isolated presentation of nonverbal stimuli - control study; combination of nonverbal and verbal stimuli; again isolated presentation of nonverbal stimuli. Brain evoked potentials (EP) are recorded in the occipital, associative areas of the two hemispheres and the vertex. Hemispheric differences were established in the EP of the nonverbal stimuli in the three series for the occipital regions. These differences were pronounced with respect to the latency and insignificant with respect to the amplitude. The late positive component had a shorter latency in the right hemisphere. No interhemispheric difference in the EP parameters were established for verbal stimuli, presented in the centre of the visual field. The functional interhemispheric asymmetry, assessed through the brain EP, is manifested in cases of isolated presentation of stimuli in the two halves of the visual field.
D000161:Acoustic Stimulation; D000293:Adolescent; D000328:Adult; D005074:Evoked Potentials, Visual; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D008297:Male; D009778:Occipital Lobe / Q000502:physiology; D010812:Physical Stimulation / Q000379:methods*; D011930:Reaction Time; D014794:Visual Fields