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Variability not ability: another basis for performance decrements in neglect.

B Anderson1, M Mennemeier, A Chatterjee

  • 1Department of Neurology, University of Alabama at Birmingham, Birmingham, USA. brittuab@aol.com

Neuropsychologia
|February 26, 2000
PubMed
Summary
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Spatial neglect is linked to inconsistent reaction times (RT) that vary with spatial position. This variability, not absolute loss, may explain performance deficits in neglect patients.

Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Spatial neglect is characterized by impaired performance, often reported as decreased mean task ability.
  • Few studies explore the relationship between performance consistency, optimal response times, and spatial neglect.

Observation:

  • Reaction time (RT) and its variability were assessed in relation to horizontal spatial position in individuals with and without neglect.
  • A reaction time task involved responding to visual stimuli presented at varying horizontal locations.

Findings:

  • Four out of five individuals with neglect showed increased RT variability correlated with spatial position.
  • This spatial modulation of RT variability was not observed in brain-damaged individuals without neglect.
  • The observed variability was not attributable to general left-sided processing deficits, hemianopsia, or brain damage alone.

Related Experiment Videos

Implications:

  • Performance decrements in spatial neglect may stem from an inability to consistently detect and respond, rather than an absolute loss of capacity.
  • Assessing both optimal performance and performance variability offers insight into whether a cognitive capacity is lost or merely degraded in neglect.