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Semantic factors influence multisensory pairing: a transcranial magnetic stimulation study
Gilles Pourtois1, Beatrice de Gelder
1Laboratory for Cognitive and Affective Neuroscience, Tilburg University, Warandelaan 2, PO Box 90153, 5000 LE Tilburg, The Netherlands.
Neuroreport
|September 10, 2002
Summary
Semantic content, not just timing and location, influences how the brain combines sensory information. Transcranial magnetic stimulation (TMS) revealed that content impacts audio-visual integration.
Area of Science:
- Neuroscience
- Cognitive Science
- Psychology
Background:
- Traditionally, audio-visual integration is thought to depend on temporal and spatial factors.
- Neuropsychological and neurophysiological evidence suggests semantic content may also play a role.
Purpose of the Study:
- To investigate the role of semantic factors in audio-visual integration.
- To compare the impact of transcranial magnetic stimulation (TMS) on different semantic audio-visual pairings.
Main Methods:
- Used transcranial magnetic stimulation (TMS) over the left posterior parietal cortex.
- Presented face-voice and tone-shape audio-visual pairs under identical spatio-temporal conditions.
Main Results:
- TMS disrupted audio-visual integration for tone-shape pairings at 200 ms.
- Face-voice pairings were not affected by TMS under the same conditions.
Conclusions:
- Semantic content is a crucial determinant of audio-visual integration, alongside spatial and temporal factors.
- TMS is a valuable tool for studying the influence of semantic factors in multi-sensory perception.