Mechanisms of spatial attention revealed by hemispatial neglect

Argye Elizabeth Hillis, J. Toby Mordkoff, Alfonso Caramazza

Research output: Contribution to journalArticlepeer-review

Abstract

We report performance by a patient, NG, with hemispatial neglect after nondominant stroke, in detecting briefly (200 msec) presented visual targets. NG's detection of targets (gaps in circles) was determined by the location of the target in the space in which stimuli appeared. Gaps on the neglected side of a circle at fixation were rarely detected when circles of uniform size were always presented at fixation. The same targets in the same location were detected far more often in blocks that also included targets presented on each side of the central circle, or in blocks that included larger target stimuli. In these blocks, the window of space in which stimuli appeared was larger, such that the target fell closer to the center of this 'window'. These results indicate that the spatial extent of attention, and of hemispatial neglect, can be modified on the the basis of expectations and task requirements.

Original languageEnglish (US)
Pages (from-to)433-442
Number of pages10
JournalCortex
Volume35
Issue number3
DOIs
StatePublished - Jun 1999

Keywords

  • Hemispatial neglect
  • Spatial attention

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience

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