Modulation of somatosensory event-related potential components in a tactile–visual cross-modal task

Human tactile discrimination studies have shown that visual stimuli enhance tactile performance. Other studies on event-related potentials showed that somatosensory N140 was enhanced when attention of human subjects was directed to tactile stimuli. Therefore, we hypothesized that N140 would be modul...

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Bibliographic Details
Published in:Neuroscience 2006, Vol.138 (4), p.1387-1395
Main Authors: Ohara, S., Lenz, F.A., Zhou, Y.-D.
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
EEG
Electroencephalography
Evoked Potentials, Somatosensory - physiology
Female
frontal
Functional Laterality - physiology
Fundamental and applied biological sciences. Psychology
human
Humans
Male
Middle Aged
N140
Neuropsychological Tests
Photic Stimulation
Physical Stimulation
Psychomotor Performance - physiology
Reaction Time - physiology
SII
Somatosensory Cortex - physiology
Touch - physiology
Vertebrates: nervous system and sense organs
Visual Perception - physiology
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Summary:Human tactile discrimination studies have shown that visual stimuli enhance tactile performance. Other studies on event-related potentials showed that somatosensory N140 was enhanced when attention of human subjects was directed to tactile stimuli. Therefore, we hypothesized that N140 would be modulated when human subjects performed tactile cross-modal delay tasks. Scalp-event-related potentials were recorded from normal subjects performing either a tactile–tactile unimodal, or a tactile–visual cross-modal delayed matching-to-sample task. Identical tactile stimuli were used in both tasks. N140 component evoked by the tactile stimuli was enhanced in the cross-modal task. Enhancement of this component was also observed in control cross-modal tasks. The results suggest that tactile–visual cross-modal association affects tactile sensory-perceptual processes in humans.
ISSN:0306-4522
1873-7544
DOI:10.1016/j.neuroscience.2005.12.005