Timing of right parietal and frontal cortex activity in visuo-spatial perception: A TMS study in normal individuals

Brigida Fierro, Filippo Brighina, Aurelio Piazza, Massimiliano Oliveri, Edoardo Bisiach

Research output: Contribution to journalArticlepeer-review

Abstract

In a recent study we showed that repetitive transcranial magnetic stimulation (rTMS) with train duration of 400 ms over right frontal and right posterior parietal cortices gives rise to transitory contralateral visuo-spatial neglect in normal subjects. In the present experiment we investigated whether using single-pulse TMS it is possible to obtain information about the timing of cortical activity related to spatial cognition. Nine healthy subjects performed in baseline condition and during TMS a tachistoscopic task, requiring a forced-choice estimation of the length of the two segments of prebisected horizontal lines. Single-pulse TMS was triggered at various time intervals (150 ms, 225 ms, 300 ms) after visual stimulus onset with a focal coil over P6 and F4 (according to 10/20 EEG system). Relative transitory rightward bias was observed only when parietal TMS was delivered 150 ms after visual stimulus presentation. Frontal stimulation induced no effect on visuo-spatial perception with the time intervals explored.

Original languageEnglish
Pages (from-to)2605-2607
Number of pages3
JournalNeuroReport
Volume12
Issue number11
Publication statusPublished - Aug 8 2001

Keywords

  • Neglect
  • Right frontal cortex
  • Right parietal cortex
  • TMS
  • Visuo-spatial perception timing

ASJC Scopus subject areas

  • Neuroscience(all)

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