Neuroscience 2002 Abstract
| Presentation Number: | 841.4 |
|---|---|
| Abstract Title: | A FUNCTIONAL MRI STUDY OF SELECTIVE ATTENTION TO DISCRIMINATING TACTILE FORM OR LOCATION. |
| Authors: |
Van Boven, R. W.*1
; Beauchamp, M. S-.1
; Ingeholm, J. E.1
; Lee, K. E.1
; Bikle, C.1
; Marrett, S.1
; Ungeleider, L. G.1
1Laboratory of Brain and Cognition, NIMH, Bethesda, MD |
| Primary Theme and Topics |
Sensory Systems - Tactile/Somatosensory -- Cortex imaging |
| Session: |
841. Tactile/somatosensory: cortex imaging II Poster |
| Presentation Time: | Thursday, November 7, 2002 11:00 AM-12:00 PM |
| Location: | Hall A2-B3 E-4 |
| Keywords: | tactile, lateralization, somatosensory, fMRI |
Previous functional neuroimaging studies have not determined cortical areas of selective somatosensory processing of stimulus attributes or location. To address this, we studied 20 subjects trained in two tactile tasks. For both tasks, a set of domes with gratings was used. Gratings were delivered to the immobilized finger. For each trial, a grating was first applied distally with the bars/grooves parallel to the long axis of the finger. Subjects were either required to judge if the grating orientation (GOT) or stimulation site (location task (LOT) changed during a 2nd presentation. Subjects attended to either orientation or location while activations were measured using block design fMRI at 3T. Group performance was very similar for the GOT (74% correct responses) and LOT (74%). Similar activations for both tasks were seen in the primary and secondary somatosensory cortices. The intraparietal sulcus (IPS) was preferentially activated bilaterally in most subjects during the GOT. However, there were significantly more GOT preferring voxels in the left hemisphere regardless of which hand was stimulated (Rt hand trials, p<0.002, paired t-test; Lft hand trials, p<0.01.) LOT preferring voxels (p<0.01) were located in the right supramarginal gyrus in 10 of 12 subjects during right hand stimulation and 9 of 12 subjects during left hand stimulation. These data suggest a hemispheric lateralization of somatosensory processing for discriminating form in the left IPS (BA 7) and location in the right supramarginal gyrus (BA 40).
Supported by NIMH/IRP
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2002 Neuroscience Meeting Planner. Orlando, FL: Society for Neuroscience, 2002. Online.
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