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K complex

a brief, high-amplitude spike-and-rebound waveform recorded in the scalp electroencephalograph during sleep onset. K complexes and sleep spindles occur normally during Stage 2 NREM sleep (see sleep stages). It is postulated that they may suppress sleep disruptions and coordinate memory consolidation. K complexes can also be involved in nocturnal seizures.

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Psychology term of the day

June 18th 2024



n. a type of involuntary movement caused by a rapid succession of alternate muscular contractions and relaxations. Although some forms of clonus, such as hiccups, are considered normal, most such movements are abnormal; for example, clonus occurs as part of a tonic–clonic seizure. More severe forms are associated with spinal cord damage, poisoning (e.g., from strychnine), or an infection (e.g., syphilis).