Sequences of cortical activation for tactile pattern discrimination using magnetoencephalography.

Abstract:

:To observe sequential stages in tactile pattern discrimination and their modification with and without attention, we used whole-head anatomically constrained magnetoencephalography to spatiotemporally map brain responses. Eight, normal, right-handed participants discriminated between two patterns presented on the palm. Latencies of neural activity were determined from stimulus contact with the palm. Early cortical activation moved from sensorimotor cortex (SM1) to secondary somatosensory cortex (SII), Broca's area (BA), and superior parietal cortex by 65 ms. It continued bilaterally to temporal and frontal poles by 290 ms. Subtraction of nonattended from attended conditions removed primarily the early contralateral sensory components. There was some indication of a preferred order of sensory processing that may express and optimize hemispheric computational specializations. Results indicate similar functional organizations for tactile and visual pattern recognition.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Reed CL,Hagler DJ Jr,Marinkovic K,Dale A,Halgren E

doi

10.1097/WNR.0b013e32832c5f65

subject

Has Abstract

pub_date

2009-07-01 00:00:00

pages

941-5

issue

10

eissn

0959-4965

issn

1473-558X

journal_volume

20

pub_type

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