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Long-term plasticity in mouse sensorimotor circuits after rhythmic whisker stimulation
Pierre Mégevand1, Edgardo Troncoso, Charles Quairiaux
1Department of Fundamental Neuroscience, Faculty of Medicine, University of Geneva, 1211 Geneva 4, Switzerland.
Summary
Rhythmic whisker movements in mice enhance sensory processing in the brain. This natural brain plasticity, observed in the somatosensory (barrel) cortex, suggests a mechanism for learning during sensory perception.
Area of Science:
- Neuroscience
- Sensory processing
Background:
- Mice use rhythmic whisker movements for environmental exploration.
- Neuronal activity in somatosensory pathways is modulated by whisker movement frequency.
- The role of rhythmic neuronal activity in sensory integration remains unclear.
Purpose of the Study:
- To investigate the effects of rhythmic whisker stimulation on neuronal activity.
- To explore the potential for sensory plasticity in natural settings.
- To understand the mechanisms underlying sensory-driven learning.
Main Methods:
- Rhythmic whisker stimulation in anesthetized mice.
- Mapping of somatosensory-evoked potentials.
- Intracortical recordings in the barrel cortex and motor cortex.
- Environmental enrichment paradigm.
Main Results:
- Rhythmic whisker stimulation induced long-lasting, frequency-specific potentiation of somatosensory-evoked potentials in the barrel cortex.
- Decreased somatosensory-evoked responses were observed in the supragranular layers of the motor cortex.
- Environmental enrichment led to increased somatosensory-evoked responses, occluding further potentiation by rhythmic stimulation.
Conclusions:
- Natural, rhythmic whisker activity can modify cerebral processing of sensory information.
- Sensory plasticity induced by environmental enrichment and rhythmic stimulation may share common mechanisms.
- Rhythmic sensory input offers a potential mechanism for learning during perception.
