Sensorimotor rhythm
The sensorimotor rhythm (SMR) is a
ECoG over the sensorimotor cortex. For most individuals, the frequency of the SMR is in the range of 7 to 11 Hz.[1]
Meaning
The meaning of SMR is not fully understood. Phenomenologically, a person is producing a stronger SMR amplitude when the corresponding sensorimotor areas are idle, e.g. during states of immobility. SMR typically decreases in amplitude when the corresponding sensory or motor areas are activated, e.g. during motor tasks and even during motor imagery.[2]
Conceptually, SMR is sometimes mixed up with
mu rhythm.[3]
Relevance in research
Neurofeedback
Neurofeedback training can be used to gain control over the SMR activity.[4] Neurofeedback practitioners believe that this feedback enables the subject to learn the regulation of their own SMR. People with
autism[8] may benefit from an increase in SMR activity via neurofeedback
.
Furthermore, in the sport domain, SMR neurofeedback training has been found to be useful to enhance the golf putting performance.[4] In the field of Brain–Computer Interfaces (BCI), the deliberate modification of the SMR amplitude during motor imagery can be used to control external applications.[9]
See also
- Electroencephalography – Electrophysiological monitoring method to record electrical activity of the brain
Brain waves
- Delta wave – (0.1 – 3 Hz)
- Theta wave – (4 – 7 Hz)
- Alpha wave – (8 – 12 Hz)
- Mu wave – (7.5 – 12.5 Hz)
- SMR wave – (12.5 – 15.5 Hz)
- Beta wave – (12 – 31 Hz)
- Gamma wave – (32 – 100 Hz)
References
- PMID 7691544.
- ^ Ernst Niedermeyer, Fernando Lopes da Silva Electroencephalography. Basic principles, Clinical Applications and Related Fields. 3rd edition, Williams & Wilkins Baltimore 1993
- S2CID 4774796.
- ^ PMID 26866770.
- PMID 6542077.
- PMID 12543448.
- S2CID 38841067.
- .
- ^ Andrea Kübler and Klaus-Robert Müller. An introduction to brain computer interfacing. In Guido Dornhege, Jose del R. Millán, Thilo Hinterberger, Dennis McFarland, and Klaus-Robert Müller, editors, Toward Brain–Computer Interfacing, pages 1-25. MIT press, Cambridge, MA, 2007
Further reading
- Robbins, Jim (2000). A Symphony in the Brain. Atlantic Monthly Press. ISBN 978-0-87113-807-1.
- Sterman, M. B.; Wyrwicka, W. (1967). "EEG correlates of sleep: Evidence for separate forebrain substrates". Brain Research. 6 (1): 143–163. PMID 6052533.
- Wyrwicka, W.; Sterman, M. B. (1968). "Instrumental conditioning of sensorimotor cortex eeg spindles in the waking cat". Physiology and Behavior. 3 (5): 703–707. .
- Warren, Jeff (2007). "The SMR". The Head Trip: Adventures on the Wheel of Consciousness. Toronto: Random House Canada. ISBN 978-0-679-31408-0.
- Arns, Martijn; Sterman, Maurice B. (2019). Neurofeedback: How it all started. Nijmegen, The Netherlands: Brainclinics Insights. ISBN 9789083001302.
- Cheng, M. Y. (2017, January 9). Golf gadget cuts scores at a stroke by calming brain. The Times. Retrieved from https://www.thetimes.co.uk/article/golf-gadget-cuts-scores-at-a-stroke-by-calming-brain-f5kc06057