Independent attentional scanning in the separated hemispheres of split-brain patients

Steven J. Luck, Steven A. Hillyard, George R Mangun, Michael S. Gazzaniga

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


Previous studies of visuospatial attention indicated that the isolated cerebral hemispheres of split-brain patients maintain an integrated, unitary focus of attention, presumably due to subcortical attentional mechanisms. The present study examined whether a unitary attentional focus would also be observed during a visual search task in which subjects scanned stimulus arrays for a target item. In a group of four commissurotomy patients, the search rate for bilateral stimulus arrays was found to be approximately twice as fast as the search rate for unilateral arrays, indicating that the separated hemispheres were able to scan their respective hemifields independently. In contrast, the search sates for unilateral and bilateral arrays were approximately equal in a group of six normal control subjects, suggesting that the intact corpus callosum in these subjects is responsible for maintaining a unitary attentional focus during visual search.

Original languageEnglish (US)
Pages (from-to)84-91
Number of pages8
JournalJournal of Cognitive Neuroscience
Issue number1
StatePublished - Dec 1994

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience


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