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Summary
This summary is machine-generated.

Lateral stimulus-response (SR) mapping impacts auditory intensity discrimination, affecting both accuracy and response speed. However, these effects were not observed in visual intensity discrimination, challenging common spatial processing theories.

Keywords:
brightnessgeneralized magnitude systemlateral response setloudnessresponse codestimulus intensity

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Area of Science:

  • Cognitive Psychology
  • Auditory Perception
  • Visual Perception

Background:

  • Spatial response codes are theorized to influence perceptual discrimination based on stimulus intensity.
  • Lateral stimulus-response (SR) mapping effects have been observed in prior auditory studies.

Purpose of the Study:

  • To investigate lateral SR-mapping effects on auditory and visual intensity discrimination.
  • To clarify inconsistencies in visual domain findings and test cross-modality correlations.

Main Methods:

  • A preregistered study with 98 participants.
  • Participants performed auditory and visual intensity discrimination tasks with lateralized response buttons.
  • Stimulus-response mapping varied, with loud/bright stimuli assigned to one side and soft/dim to the other.

Main Results:

  • Auditory intensity discrimination showed significant SR-mapping effects on error rates and response times, with loudness predicting response-side differences.
  • Visual brightness discrimination yielded null or inconclusive results for SR-mapping effects.
  • Cross-modality correlations for SR-mapping effects were inconclusive.

Conclusions:

  • Lateral SR-mapping effects are confirmed in auditory intensity discrimination but not in visual brightness discrimination.
  • Findings challenge the existence of a common spatial processing mechanism for auditory and visual intensity comparison.
  • If a common mechanism exists, its influence on visual judgments is minimal and not detectable even in large samples.