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Cross-Modal Multivariate Pattern Analysis
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Cross-modal congruency modulates evidence accumulation, not decision thresholds.

Natálie Brožová1, Lukas Vollmer1, Björn Kampa2

  • 1Institute for Hearing Technology and Acoustics, RWTH Aachen University, Aachen, Germany.

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Summary

This study shows how the brain connects sound and sight, finding that cross-modal correspondences (CMCs) influence sensory processing and evidence accumulation during decision-making.

Keywords:
EEGaudio-visual integrationcognitive modelingcross-modal correspondencesmultisensory perceptionperceptual decision-making

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Sensory Perception

Background:

  • Audiovisual cross-modal correspondences (CMCs) link auditory and visual information subconsciously.
  • CMCs impact multisensory perception, improving reaction times and accuracy.
  • The distinct effects of statistical vs. semantic CMCs on information processing are not well understood.

Purpose of the Study:

  • To investigate how different types of CMCs influence information processing and decision-making.
  • To explore the neural mechanisms underlying audiovisual integration.
  • To differentiate the roles of congruency in sensory encoding and evidence accumulation.

Main Methods:

  • Utilized the Implicit Association Test with sequentially presented unisensory stimuli.
  • Linked stimuli via CMCs within experimental blocks using congruent or incongruent response instructions.
  • Integrated behavioral data with electroencephalography (EEG) using neurally informed drift-diffusion modeling.

Main Results:

  • Identified distinct neural components differentiating congruent and incongruent stimuli across modalities.
  • Found an early neural component enhancing sensory encoding in congruent trials.
  • Observed a late neural component affecting evidence accumulation, especially in incongruent trials.

Conclusions:

  • Cross-modal congruency significantly modulates neural activity during multisensory perceptual decision-making.
  • The findings suggest CMCs primarily influence sensory information processing and accumulation.
  • Decision thresholds appear unaffected by cross-modal congruency, with effects seen in earlier and later neural stages.