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A Method to Study Adaptation to Left-Right Reversed Audition
Published on: October 29, 2018
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Auditory-visual integration modulates location-specific repetition suppression of auditory responses
Talia Shrem1, Micah M Murray2,3,4,5, Leon Y Deouell1,6
1Human Cognitive Neuroscience Lab, Department of Psychology, The Hebrew University of Jerusalem, Jerusalem, Israel.
Psychophysiology
|July 29, 2017
Summary
Multisensory interactions influence auditory spatial processing. Visual information crossmodally affects auditory brain responses at the P2 latency, impacting spatial selectivity.
Area of Science:
- Neuroscience
- Auditory Perception
- Multisensory Integration
Background:
- Spatial encoding is crucial for integrating sensory information.
- Auditory evoked responses show repetition suppression, but its modulation by multisensory processes is not fully understood.
Purpose of the Study:
- To investigate how audiovisual interactions modulate spatial encoding in auditory processing.
- To determine the stage at which spatial information is affected by multisensory integration.
Main Methods:
- Two experiments using a repetition-suppression paradigm with auditory stimuli in free field.
- Experiment 1: Assessed auditory spatial sensitivity by varying spatial distance between adapter and test sounds.
- Experiment 2: Introduced visual stimuli (flashes) alongside auditory stimuli to examine audiovisual interactions and their effect on repetition suppression.
Main Results:
- Auditory spatial sensitivity, indexed by P2 latency attenuation, was inversely related to spatial separation between sounds.
- Audiovisual incongruence, demonstrated by the ventriloquism effect, reduced location-specific repetition suppression at P2 latency.
- Multisensory effects showed topographic modulations, indicating altered contributions of neural sources.
Conclusions:
- Auditory responses at P2 latency are modulated by spatially selective neural activity.
- Visual information crossmodally influences this auditory spatial processing.
- Multisensory integration plays a significant role in shaping auditory spatial perception.
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