Is the somatosensory N250 related to deviance discrimination or conscious target detection?

Effects of attention to, and probability of sudden changes in, repetitive stimuli on somatosensory evoked potentials (SEP) were studied. Low- (30 Hz) and high-frequency (140 Hz) vibratory stimuli were delivered in random order to the middle finger of the left hand with different presentation probabi...

Full description

Saved in:
Bibliographic Details
Published in:Electroencephalography and clinical neurophysiology 1996-03, Vol.100 (2), p.115-125
Main Authors: Kekoni, J., Hämäläinen, H., McCloud, V., Reinikainen, K., Näätänen, R.
Format: Article
Language:English
Subjects:
Adult
Attention
Attention - physiology
Behavioral psychophysiology
Biological and medical sciences
Deviance probability
Discrimination (Psychology) - physiology
Electric Stimulation
Electrophysiology
Evoked Potentials, Somatosensory
Fundamental and applied biological sciences. Psychology
Humans
Probability
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Somatosensory evoked potentials
Somatosensory N250
Stimulus deviance
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Effects of attention to, and probability of sudden changes in, repetitive stimuli on somatosensory evoked potentials (SEP) were studied. Low- (30 Hz) and high-frequency (140 Hz) vibratory stimuli were delivered in random order to the middle finger of the left hand with different presentation probabilities in different blocks. Also ignore conditions were administered. In the ignore conditions, the probability had no effect on SEPs. However, when the standard stimuli were omitted, the “deviants” elicited small N140 and P300 deflections not observed in response to deviants when standards were also present. In the attention conditions, deviant stimuli (targets) elicited large N250 and P300 deflections which increased in amplitude with a decreased target probability. However, when subjects counted infrequently presented “deviants” alone (standards omitted) the enhanced N140 and the P300 with shortened latency were elicited, but no N250 wave could be found. At the ipsilateral side, a distinct N200 deflection was seen which could be the N250 with a shorter latency because of an easier task (detection instead of discrimination). The results might be interpreted as suggesting that the somatosensory N250 is related to conscious detection of target stimuli.
ISSN:0168-5597
0013-4694
DOI:10.1016/0013-4694(95)00231-6