Effects of stimulus frequency and duration on the somatosensory mismatch negativity

Spackman, Lynne, Boyd, Stewart and Towell, Anthony (2007) Effects of stimulus frequency and duration on the somatosensory mismatch negativity. Clinical Neurophysiology, 118 (5). e175. ISSN 1388-2457

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Official URL: http://dx.doi.org/10.1016/j.clinph.2006.07.291


Somatosensory processing of duration and frequency changes was investigated using the somatosensory mismatch negativity (sMMN), a preattentively evoked somatosensory event-related potential analogous to the auditory mismatch negativity. Intermittent vibration to the fingertips of either hand was presented using a 2-stimulus oddball paradigm (deviant p = 0.10). One group (N = 12, 18–38 yr) was presented with stimulus pairs of 20/70, 50/150 and 170/250 ms. A second group (N = 10, 19–34 yr) was tested using frequency pairs of 200/70 Hz. A psychophysical study confirmed the subjects’ ability to discriminate between different stimulus pairs, with good discrimination between all stimuli except for the longest durations where the average probability was 50%. Both frequency changes and duration increments/decrements revealed sMMNs. Peak latency occurred between 120 and 200 ms and increased with longer durations. A significant decrease in amplitude was observed with the 170/250 ms pairing, coinciding with a positive correlation between individual discrimination performance and amplitude. This study reveals similarities between the auditory and sMMN and helps characterize the shared features of these responses.

Item Type: Article
Subjects: University of Westminster > Social Sciences and Humanities
Depositing User: Miss Nina Watts
Date Deposited: 18 Feb 2009 15:24
Last Modified: 30 Oct 2009 12:00
URI: http://westminsterresearch.wmin.ac.uk/id/eprint/6028

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