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Mechanisms controlling neuronal plasticity in somatosensory cortex
1Département de physiologie, Université de Montréal, QC, Canada.
Canadian Journal of Physiology and Pharmacology
|May 1, 1997
Summary
gamma-Aminobutyric acid (GABA) neurons in the somatosensory cortex control receptive fields. Basal forebrain projections modulate this, enabling neuronal plasticity and altering somatotopic maps.
Area of Science:
- Neuroscience
- Neurophysiology
- Cortical plasticity
Background:
- gamma-Aminobutyric acid (GABA) neurons are key regulators of receptive field properties in the somatosensory cortex.
- Neuronal excitability in the cortex is influenced by activity originating from the basal forebrain.
Purpose of the Study:
- To investigate the role of basal forebrain projections in modulating cortical plasticity.
- To test the hypothesis that cholinergic and GABAergic projections from the basal forebrain facilitate neuronal plasticity in the somatosensory cortex.
Main Methods:
- The study proposes a mechanism involving basal forebrain modulation of cortical inhibition and excitation.
- Focuses on the interplay between acetylcholine release and GABAergic signaling.
Main Results:
- A simultaneous reduction in cortical inhibition and increased acetylcholine release is proposed.
- This mechanism allows sensory signals to induce long-term changes in receptive field characteristics.
Conclusions:
- Basal forebrain projections are crucial for creating a cortical state conducive to neuronal plasticity.
- This process underlies adaptive changes in the somatotopic organization of the primary somatosensory cortex.