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Polarity correspondence effect between loudness and lateralized response set.

Seah Chang1, Yang Seok Cho1

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Summary

Loudness variations create polarity codes influencing response selection, similar to pitch-based associations. Stimulus location further modulates this effect, demonstrating spatial influences on auditory perception and response.

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Area of Science:

  • Cognitive Psychology
  • Auditory Perception
  • Human-Computer Interaction

Background:

  • The spatial-musical association of response codes effect demonstrates improved performance when high pitch tones map to up/right responses and low pitch tones to down/left responses.
  • Previous research primarily focused on pitch-based associations, leaving the role of other auditory features, like loudness, less explored.

Purpose of the Study:

  • To investigate whether loudness variations form polarity codes influencing response selection.
  • To examine the interplay between loudness-based polarity codes and spatial information from stimulus presentation.

Main Methods:

  • Four experiments were conducted involving loudness-judgment and timbre-judgment tasks.
  • Auditory stimuli varied in loudness and were presented either binaurally or to a specific ear (left or right).
  • Response selection and performance accuracy were measured.

Main Results:

  • A correspondence effect between loudness and response side was observed irrespective of task relevance (Experiments 1 & 2).
  • The presentation ear modulated this correspondence effect, indicating an influence of spatial codes (Experiments 3 & 4).
  • The effect of ear presentation was marginally significant in the timbre-judgment task (Experiment 4).

Conclusions:

  • Loudness variations generate polarity codes that impact response selection, extending the concept beyond pitch.
  • Stimulus location (ear of presentation) acts as a spatial code that modulates these loudness-based effects, leading to a stimulus eccentricity effect.
  • Findings support the polarity correspondence principle, integrating auditory features and spatial information in response selection.