Document Detail

Effects of stimulus frequency and duration on somatosensory discrimination responses.
MedLine Citation:
PMID:  16917766     Owner:  NLM     Status:  MEDLINE    
Somatosensory processing of duration and frequency changes was investigated using event-related potentials to vibrotactile stimuli. Intermittent vibration to the fingertips of either hand was presented using a two-stimulus odd-ball paradigm (deviant P = 0.10). One group (N = 12, 18-38 years) was presented with stimulus pairs of 20/70, 50/150 and 170/250 ms. A second group (N = 10, 19-34 years) was tested using frequency pairs of 200/70 Hz. A psychophysical study examined the subjects' ability to discriminate between different stimulus pairs. A clear negative shift in the response to the deviant stimulus was recorded with all the stimulus conditions used in both experiments. Both frequency changes and duration increments/decrements revealed an initial negativity in the subtraction waveform with a mean onset of 90-170 ms and a following positivity, both of which were dependent on the duration of the stimulus used. A significant decrease in the amplitude of both components was observed with the 170/250 ms pairing, coinciding with a positive correlation between individual discrimination performance and amplitude. These results support the existence of a somatosensory mismatch response with features similar to those of the aMMN and highlight the relevance of the somatosensory-specific positivity. Results from the duration experiment also resolve some of the discrepancies between previous studies.
L A Spackman; S G Boyd; A Towell
Related Documents :
19897796 - Stimulus and response conflict processing during perceptual decision making.
22761876 - Transcriptome sequencing and comparative analysis of saccharina japonica (laminariales,...
22324426 - The rs domain of arabidopsis splicing factor rrc1 is required for phytochrome b signal ...
12181586 - Desynchronization of brain rhythms with soft phase-resetting techniques.
19619586 - A new morphometric implemented video-image analysis protocol for the study of social mo...
22546806 - Photocatalytic degradation of p-nitrophenol by zinc oxide particles.
Publication Detail:
Type:  Journal Article     Date:  2006-08-18
Journal Detail:
Title:  Experimental brain research     Volume:  177     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-01-31     Completed Date:  2007-07-25     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  21-30     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Cognition / physiology
Discrimination (Psychology) / physiology*
Evoked Potentials, Somatosensory / physiology
Psychomotor Performance / physiology
Somatosensory Cortex / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Precision in orthopaedic computer navigation
Next Document:  Interaction between location- and frequency-based inhibition of return in human auditory system.