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
Neuroreportjournal_title
Neuroreportauthors
Reed CL,Hagler DJ Jr,Marinkovic K,Dale A,Halgren Edoi
10.1097/WNR.0b013e32832c5f65subject
Has Abstractpub_date
2009-07-01 00:00:00pages
941-5issue
10eissn
0959-4965issn
1473-558Xjournal_volume
20pub_type
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