NDLI: Changes in the somatosensory N250 and P300 by the variation of reaction time

Content Provider	Springer Nature Link
Author	Kida, Tetsuo Nishihira, Yoshiaki Hatta, Arihiro Wasaka, Toshiaki Nakata, Hiroki Sakamoto, Masari Nakajima, Tsuyoshi
Copyright Year	2003
Abstract	We investigated the relationship between somatosensory event-related potentials (ERP) and the variation of reaction time (RT). For this purpose, we recorded the ERPs (N250 and P300) in fast- and slow-reaction trials during a somatosensory discrimination task. Strong, standard, and weak target electrical stimuli were randomly delivered to the left median nerve at the wrist with a random interstimulus interval (900–1,100 ms). All the subjects were instructed to respond by pressing a button with their right thumb as fast as possible whenever a target stimulus was presented. We divided all the trials into fast- and slow-RT trials and averaged the data. N250 latency tended to be delayed when the RT was slow, but not significantly. P300 latency was delayed significantly when the RT was slow, but to a much lesser extent than the RT delay, so we concluded that the change of RT was not fully determined by the processes reflected by the somatosensory N250 or P300. Furthermore, the larger and earlier P300 in the fast-RT trials implied that when larger amounts of attentional resources were allocated to a given task, the speed of stimulus evaluation somewhat increased and RT was shortened to a great extent. N250 amplitude did not significantly vary in the two RT clusters. In conclusion, the somatosensory N250 reflects active target detection, which is relatively independent of the modulation of the response speed, whereas the somatosensory P300 could change without manipulation of either the stimulus or the response processing demand.
Starting Page	326
Ending Page	330
Page Count	5
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	89
Issue Number	3
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-03-18
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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