Term
| electroencephalogram (EEG) |
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Definition
| a measurement of electrical activity generated by the brain and recorded from the scalp |
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Term
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Definition
| pathologically large and synchronous neural activity that spreads to encompass the entire cerebral hemispheres |
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Term
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Definition
| pathologically large and synchronous neural activity that remains localized to a relatively small region of the brain |
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Term
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Definition
| a chronic brain disorder characterized by recurrent seizures |
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Term
| rapid eye movement sleep (REM sleep) |
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Definition
| a stage of sleep characterized by low-amplitude, high-frequency EEG waves, vivid dreams, rapid eye movements, and atonia |
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Term
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Definition
| a stage of sleep characterized by large, slow EEG waves, a paucity of deams, and some muscle tone |
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Term
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Definition
| the absence of muscle tone |
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Term
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Definition
| any rhythm with a period significantly less than 1 day |
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Term
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Definition
| any rhythm with a period of about 1 day |
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Term
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Definition
| any environmental cue, such as the light-dark cycle, that signals the passage of time |
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Term
| suprachiasmatic nucleus (SCN) |
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Definition
| a small nucleus of the hypothalamus just above the optic chiasm that receives retinal innervation and synchronizes circadian rhythms with the daily light-dark cycle |
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Term
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Definition
| a gene that is critically involved in the molecular mechanism of the circadian rhythm; clock genes are translated into proteins that regulate their own transcription, and their expression rises and falls over a cycle of about 24 hours |
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