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Bilateral integration in somatosensory cortex is controlled by behavioral relevance
Hyein Park1, Hayagreev V S Keri1,2, Chaeyoung Yoo1
1Department of Biological Sciences, Purdue University, West Lafayette, IN, USA.
Nature Neuroscience
|May 14, 2025
Summary
Researchers discovered how the brain integrates sensory information from both sides of the body. Goal-directed brain activity enhances tactile information flow between hemispheres for unified perception.
Area of Science:
- Neuroscience
- Sensory processing
Background:
- Sensory perception relies on integrating bilateral stimuli.
- Mechanisms for interhemispheric neural binding of sensory information are not well understood.
Purpose of the Study:
- To investigate how neurons in the primary somatosensory cortex (S1) coordinate stimulus information across hemispheres.
- To understand the neural basis of unified sensory perception.
Main Methods:
- Large-scale neural recordings from the left and right primary somatosensory cortex (S1) in mice.
- Behavioral task involving active whisker touch and reward association.
- In vivo manipulation of callosal S1 signaling.
Main Results:
- Mice exhibited greater whisker bilateral symmetry when touching reward-associated stimuli.
- Synchronous spiking and enhanced spike-field coupling were observed between S1 hemispheres for rewarded stimuli.
- Ipsilateral touch facilitated contralateral whisker response, particularly for rewarded stimuli.
- Silencing callosal S1 signaling diminished interhemispheric synchrony and bilateral facilitation.
Conclusions:
- Interhemispheric coupling in S1 is a goal-directed process, not merely stimulus-driven.
- A state-dependent logic augments tactile information flow through the corpus callosum for unified perception.
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