Beta wave

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Not to be confused with beta rays.
Beta waves

Beta wave, or beta rhythm, is the term used to designate the frequency range of human brain activity between 12.5 and 30 Hz (12.5 to 30 transitions or cycles per second). Beta waves can be split into three sections: Low Beta Waves (12.5–16 Hz, "Beta 1 power"); Beta Waves (16.5–20 Hz, "Beta 2 power"); and High Beta Waves (20.5–28 Hz, "Beta 3 power").[1] Beta states are the states associated with normal waking consciousness.


Low amplitude beta waves with multiple and varying frequencies are often associated with active, busy or anxious thinking and active concentration.[2]

Over the motor cortex beta waves are associated with the muscle contractions that happen in isotonic movements and are suppressed prior to and during movement changes.[3] Bursts of beta activity are associated with a strengthening of sensory feedback in static motor control and reduced when there is movement change.[4] Beta activity is increased when movement has to be resisted or voluntarily suppressed.[5] The artificial induction of increased beta waves over the motor cortex by a form of electrical stimulation called Transcranial alternating-current stimulation consistent with its link to isotonic contraction produces a slowing of motor movements.[6]

See also[edit]

Brain waves[edit]


  1. ^ Rangaswamy M, Porjesz B, Chorlian DB, Wang K, Jones KA, Bauer LO, Rohrbaugh J, O'Connor SJ, Kuperman S, Reich T, Begleiter (2002). "Beta power in the EEG of alcoholics". BIOLOGICAL PSYCHOLOGY. 52 (8): 831–842. doi:10.1016/s0006-3223(02)01362-8. PMID 12372655. 
  2. ^ Baumeister J, Barthel T, Geiss KR, Weiss M (2008). "Influence of phosphatidylserine on cognitive performance and cortical activity after induced stress". NUTRITIONAL NEUROSCIENCE. 11 (3): 103–110. doi:10.1179/147683008X301478. PMID 18616866. 
  3. ^ Baker, SN (2007). "Oscillatory interactions between sensorimotor cortex and the periphery". Current Opinion in Neurobiology. 17 (6): 649–55. doi:10.1016/j.conb.2008.01.007. PMC 2428102Freely accessible. PMID 18339546. 
  4. ^ Lalo, E; Gilbertson, T; Doyle, L; Di Lazzaro, V; Cioni, B; Brown, P (2007). "Phasic increases in cortical beta activity are associated with alterations in sensory processing in the human". Experimental brain research. Experimentelle Hirnforschung. Experimentation cerebrale. 177 (1): 137–45. doi:10.1007/s00221-006-0655-8. PMID 16972074. 
  5. ^ Zhang, Y; Chen, Y; Bressler, SL; Ding, M (2008). "Response preparation and inhibition: the role of the cortical sensorimotor beta rhythm". Neuroscience. 156 (1): 238–46. doi:10.1016/j.neuroscience.2008.06.061. PMC 2684699Freely accessible. PMID 18674598. 
  6. ^ Pogosyan, A; Gaynor, LD; Eusebio, A; Brown, P (2009). "Boosting cortical activity at Beta-band frequencies slows movement in humans". Current Biology. 19 (19): 1637–41. doi:10.1016/j.cub.2009.07.074. PMC 2791174Freely accessible. PMID 19800236.