The timing of neural activity during shifts of spatial attention

Debora Brignani, Jöran Lepsien, Matthew F S Rushworth, Anna Christina Nobre

Research output: Contribution to journalArticlepeer-review

Abstract

We developed a new experimental task to investigate the relative timing of neural activity during shifts of spatial attention with event-related potentials. The task enabled the investigation of nonlateralized as well as lateralized neural activity associated with spatial shifts. Participants detected target stimuli within one of two peripheral streams of visual letters. Colored letters embedded within the streams indicated which stream was to be used for target detection, signaling that participants should "hold" or "shift" their current focus of spatial attention. A behavioral experiment comparing performance in these focused-attention conditions with performance in a divided-attention condition confirmed the efficacy of the spatial cues. Another behavioral experiment showed that overt shifts of spatial attention were mainly complete by around 400 msec, placing an upper boundary for isolating neural activity that was instrumental in controlling spatial shifts. Event-related potentials recorded during a covert version of the focused-attention task showed a large amount of nonlateralized neural activity associated with spatial shifts, with significant effects starting around 330 msec. The effects started over posterior scalp regions, where they remained pronounced. Transient effects were also observed over frontal scalp regions. The results are compatible with a pivotal role of posterior parietal areas in initiating shifts of spatial attention.

Original languageEnglish
Pages (from-to)2369-2383
Number of pages15
JournalJournal of Cognitive Neuroscience
Volume21
Issue number12
DOIs
Publication statusPublished - Dec 2009

ASJC Scopus subject areas

  • Cognitive Neuroscience

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