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Beta rhythm

Beta rhythm (synonym: beta waves) – the low-amplitude fluctuations of total potential of a brain with a frequency of 14-30 Hz noted generally at emotional pressure and mental work and also at influence of various irritants.

 
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Was considered earlier that yawning enriches an organism with oxygen. However this opinion was disproved. Scientists proved that yawning, the person cools a brain and improves its working capacity.