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Area of Science:

  • Cognitive Psychology
  • Spatial Cognition
  • Human-Computer Interaction

Background:

  • The Spatial-Numerical Association of Response Codes (SNARC) effect demonstrates a spatial association between number magnitude and response location.
  • Previous research suggests automatic spatial coding for numerical information, but less is known about other object properties like typical size.

Purpose of the Study:

  • To investigate if the typical size of objects influences response selection in bimanual tasks.
  • To determine if a SNARC-like effect occurs for object size, linking typical size to response position.

Main Methods:

  • Participants performed two tasks: magnitude comparison and semantic decision.
  • Stimuli included pictures and words of typically small and large entities (animals, objects).
  • Responses were made using left or right buttons.

Main Results:

  • Faster left-hand responses for typically small objects and faster right-hand responses for typically large objects.
  • This effect persisted across different tasks (magnitude comparison, semantic decision) and stimulus formats (pictures, words).

Conclusions:

  • Object typical size information is automatically activated and spatially coded, even when not task-relevant.
  • This spatial coding aligns small objects with the left and large objects with the right, similar to numerical SNARC effects.