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Stimulus-response compatibility in representational space

D Bächtold1, M Baumüller, P Brugger

  • 1Department of Neurology, University Hospital Zurich, Switzerland.

Neuropsychologia
|September 29, 1998
PubMed
Summary
This summary is machine-generated.

Spatial stimulus response compatibility influences number processing. Participants showed different reaction times based on whether numbers were viewed as distances or clock times, revealing insights into mental representations.

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Area of Science:

  • Cognitive Psychology
  • Neuropsychology
  • Human-Computer Interaction

Background:

  • Spatial stimulus response (S-R) compatibility describes faster reactions to stimuli presented in the same sensory field as the responding hand.
  • The Spatial Numerical Association of Response Codes (SNARC) effect demonstrates a link between number magnitude and spatial location in reaction time tasks.
  • Understanding how mental representations interact with motor outputs is crucial for cognitive neuroscience.

Purpose of the Study:

  • To investigate the influence of different mental representations of numbers on spatial stimulus response compatibility.
  • To determine if the spatial arrangement of numbers (left-to-right) is the sole factor in the SNARC effect.
  • To explore potential clinical applications for patients with representational neglect.

Main Methods:

  • Two experiments were conducted presenting numbers 1 to 11 centrally.
  • Participants performed speeded reaction time tasks using either their left or right hand.
  • Numbers were mentally framed as distances on a ruler or hours on a clock face.

Main Results:

  • A left-hand advantage for smaller numbers (<6) and a right-hand advantage for larger numbers (>6) was observed when numbers were conceptualized as distances on a ruler (RULER task).
  • A reversal of this reaction time advantage occurred when numbers were conceptualized as hours on a clock face (CLOCK task).
  • These findings indicate that the mental representation of numbers, not just their linear spatial extension, significantly modulates S-R compatibility.

Conclusions:

  • The interaction between lateralized mental representations and lateralized motor outputs provides a comprehensive explanation for the observed effects.
  • The clock face task demonstrates that the left-to-right extension of a number scale is not the sole determinant of S-R compatibility.
  • The tasks developed may have clinical utility in assessing and treating patients with neglect of representational space.