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Published on: July 31, 2019
Tactile stimulation and hemispheric asymmetries modulate auditory perception and neural responses in primary auditory
1Department of Biological Psychology, Otto-von-Guericke-University Magdeburg, Postfach 4120, 39106 Magdeburg, Germany. maria.hoefer@med.ovgu.de
Neuroimage
|May 14, 2013
Summary
Tactile stimuli enhance auditory detection, especially when presented on the left. This audiotactile interplay involves right-hemisphere networks and is linked to perceptual sensitivity.
Area of Science:
- Neuroscience
- Psychophysics
- Sensory Integration
Background:
- Multisensory integration research often focuses on audiovisual stimuli.
- Audition and touch (audiotactile) integration also significantly guides behavior.
- Hemispheric asymmetries may modulate sensory integration benefits.
Purpose of the Study:
- To investigate audiotactile integration using psychophysics and fMRI.
- To determine if task-irrelevant tactile stimuli enhance auditory detection.
- To examine the role of hemispheric asymmetries in audiotactile benefits.
Main Methods:
- Psychophysical experiments measuring auditory detection.
- Functional magnetic resonance imaging (fMRI) to observe brain activity.
- Analysis of audiotactile interactions with lateralized sounds and tactile stimuli.
Main Results:
- Auditory detection improved with synchronous and asynchronous tactile stimuli on the left.
- fMRI showed elevated signals in the primary auditory cortex (A1) for left-sided synchronous stimulation.
- Enhanced connectivity in the right hemisphere (A1, PT) correlated with performance.
Conclusions:
- Functional asymmetries influence audiotactile interplay, particularly for left-sided stimulation.
- Audiotactile integration recruits a right-hemispheric network of unisensory cortices.
- The strength of functional network connections predicts perceptual sensitivity.
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