Time-varying cortical activations related to visual-tactile cross-modal links in spatial selective attention

Tetsuo Kida*, Koji Inui, Toshiaki Wasaka, Kosuke Akatsuka, Emi Tanaka, Ryusuke Kakigi

*この研究の対応する著者

研究成果: Article査読

52 被引用数 (Scopus)

抄録

The neural mechanisms underlying unimodal spatial attention have long been studied, but the cortical processes underlying cross-modal links remain a matter of debate. To reveal the cortical processes underlying the cross-modal links between vision and touch in spatial attention, we recorded magnetoencephalographic (MEG) responses to electrocutaneous stimuli when subjects directed attention to an electrocutaneous or visual stimulus presented randomly in the left or right space. Neural responses recorded around the bilateral sylvian fissures at 85 and 100 ms after the electrocutaneous stimulus were significantly enhanced by spatial attention in both the touch-irrelevant and -relevant modalities. Source analysis revealed that the sylvian responses were generated in the secondary somatosensory cortex (SII). An early response, M50c, generated in the contralateral primary somatosensory cortex (SI), was not modulated by attention. There were no significant attentional changes in the source location or magnetic field distribution, suggesting attentional facilitation of the neural activity in SII itself, rather than a tonic bias effect or overlapping of separate neuronal populations. The results show that spatial attention enhances responses to tactile inputs in SII, independent of sensory modality attended. The underlying mechanism remains to be determined, but may be an increase in gain.

本文言語English
ページ(範囲)3585-3596
ページ数12
ジャーナルJournal of Neurophysiology
97
5
DOI
出版ステータスPublished - 2007 5

ASJC Scopus subject areas

  • 生理学
  • 神経科学(全般)

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