Beta rhythm reflects a balance between networks of nerve cells projecting from the cortex to other parts of the brain and spinal cord (i.e., pyramidal cells) (which are excitatory) and neurons that carry signals between other neurons (i.e., interneurons) (which are inhibitory). GABAA, the receptor, or binding molecule, for the neurotransmitter gamma-aminobutyric acid (GABA), is thought to regulate this rhythm (Whittington et al. 2000).
