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Publication Detail
Plasticity revealed by transcranial magnetic stimulation of early visual cortex
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Corthout E, Uttl B, Walsh V, Hallet M, Cowey A
  • Publication date:
  • Pagination:
    1565, 1569
  • Journal:
  • Volume:
  • Issue:
  • Status:
  • Print ISSN:
We applied single-pulse transcranial magnetic stimulation (TMS) to the occipital pole of healthy subjects while they performed a forced-choice visual letter-identification task. We found three separate periods when TMS suppressed performance; the first period is best explained by TMS-induced blinking whereas the last two periods are best explained by TMS-induced disruption of letter-processing in the early visual cortex. Unexpectedly, we also found that TMS-induced suppression progressively disappeared during three weeks of repeated TMS experiments. However, it was only suppression during the last two periods that disappeared; suppression during the first period remained undiminished. When subjects were then presented with dimmer letters, suppression reappeared. The most likely explanation is a practice- induced increase in neuronal activity in the early visual cortex. (C) 2000 Lippincott Williams and Wilkins.
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