Abstract
Beta waves first described by Hans Berger were associated by him with focused attention. The beta rhythms come in ranges: beta 1 (13-20 Hz), beta 2 (21-30 Hz), and gamma (30-60 Hz). Many hypothetical functions have been suggested for the beta rhythms such as coordination among multiple representations in the cortex; inhibition of movement and motor planning; preservation of the status quo; signaling of decision making, focusing action-selection network functions. The most known beta rhythms are the basal ganglia oscillations synchronous with oscillations in the motor cortical areas and reflected in the scalp recorded Rolandic beta rhythms. The Rolandic beta rhythm is inversely correlated with the fMRI-BOLD signal in the precentral cortex. In contrast the frontal beta rhythm synchronizes in response to activation of the frontal lobes. The vertex beta rhythm is induced in response in unexpected situations. Existence of several beta rhythms with different frequencies, topographies and with different functional properties presumes no single neuronal mechanism for their generation.
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