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Alpha waves again gained interest in regards to an engineering approach to the science fiction challenge of psychokinesis, i.e. control of movement of a physical object using energy emanating from a human brain. In 1988, EEG alpha rhythm was used in a brain–computer interface experiment of control of a movement of a physical object, a robot.
Symptoms of rhythmic movement disorder vary, but most share common large muscle movement patterns. Many show consistent symptoms including: [citation needed] body rocking, where the whole body is moved while on the hands and knees. head banging, where the head is forcibly moved in a back and forth direction.
Unlike the alpha wave, which occurs at a similar frequency over the resting visual cortex at the back of the scalp, the mu rhythm is found over the motor cortex, in a band approximately from ear to ear. People suppress mu rhythms when they perform motor actions or, with practice, when they visualize performing motor actions.
Hypsarrhythmia; Other names: From Greek Hyps= Height: A comparison of an awake, resting (with activity), normal EEG with a hypsarrhythmia EEG. The hypsarrhythmia EEG is from a 4-month old girl with cryptogenic West syndrome.
[114] [115] Alpha rhythm based BCI was the first BCI for control of a robot. [116] [117] In particular, some forms of BCI allow users to control a device by measuring the amplitude of oscillatory activity in specific frequency bands, including mu and beta rhythms.
Disruptions in circadian rhythms can lead to somatic and cognitive symptoms, as seen in jet lag or during daylight saving time. Individuals diagnosed with, or at risk for, mood disorders may be especially sensitive to these disruptions and thus, vulnerable to episodes of depression or mania when circadian rhythm disruptions occur. [10] [11] [12 ...
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Thalamocortical alpha frequency oscillations have been noted in the human occipital-parietal cortex. This activity could be originated by the pyramidal neurons in layer IV. [ 3 ] It has been shown that alpha rhythms seem to be related to the focus of one's attention: external focus on visual tasks diminishes alpha activity while internal focus ...