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Related Experiment Video

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Cross-Modal Multivariate Pattern Analysis

Cross-Modal Multivariate Pattern Analysis

Published on: November 9, 2011

Top-down and bottom-up modulation in processing bimodal face/voice stimuli.

Marianne Latinus¹, Rufin VanRullen, Margot J Taylor

¹Université de Toulouse, UPS, CNRS, Centre de recherche Cerveau et Cognition, Toulouse, France. marianne@psy.gla.ac.uk

BMC Neuroscience

|March 13, 2010

Summary

In a gender categorization task, face processing dominates voice processing. Top-down influences affect early brain activity, while bottom-up interactions occur later, revealing audiovisual integration dynamics.

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Area of Science:

Neuroscience
Cognitive Psychology
Auditory and Visual Perception

Background:

The human brain integrates multimodal information, with bimodal stimulation potentially facilitating or interfering with perception.
Comparing congruent and incongruent bimodal stimuli helps elucidate sensory dominance in cognitive tasks.

Purpose of the Study:

To investigate audiovisual interactions influenced by stimulus properties (bottom-up) and task demands (top-down).
To examine how congruent and incongruent face-voice stimuli affect gender categorization and brain activity.

Main Methods:

Simultaneous presentation of faces and voices with congruent or incongruent gender information.
Recording of electroencephalography (ERGs) during a gender categorization task.
Behavioral analysis of reaction times and accuracy, alongside ERP analysis.

Main Results:

Behaviorally, unattended modalities impacted attended modality processing, with greater disruption for attended voices.
Early brain processing (30-100 ms) showed top-down modulations over unisensory cortices.
Later activity (180-230 ms) revealed greater right frontal activation for incongruent stimuli compared to congruent ones.

Conclusions:

Face processing dominates voice processing during a gender categorization task.
Top-down influences modulate early neural activity, whereas bottom-up interactions manifest later in processing.
Audiovisual integration is dynamically modulated by both task-related (top-down) and stimulus-driven (bottom-up) factors.