Functional MRI of working memory and selective attention in vibrotactile frequency discrimination |
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| Authors: | Peter Sörös Jonathan Marmurek Fred Tam Nicole Baker W Richard Staines Simon J Graham |
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| Institution: | (1) Imaging Research, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada;(2) Department of Kinesiology, University of Waterloo, Ontario, Canada;(3) The Rotman Research Institute, Baycrest, Toronto, Ontario, Canada;(4) Department of Medical Biophysics, University of Toronto, Ontario, Canada |
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| Abstract: | Background Focal lesions of the frontal, parietal and temporal lobe may interfere with tactile working memory and attention. To characterise
the neural correlates of intact vibrotactile working memory and attention, functional MRI was conducted in 12 healthy young
adults. Participants performed a forced-choice vibrotactile frequency discrimination task, comparing a cue stimulus of fixed
frequency to their right thumb with a probe stimulus of identical or higher frequency. To investigate working memory, the
time interval between the 2 stimuli was pseudo-randomized (either 2 or 8 s). To investigate selective attention, a distractor
stimulus was occasionally presented contralaterally, simultaneous to the probe. |
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