What does "k-complex" mean?

A waveform that occurs approximately every 60–100 seconds during stage 2 of NREM sleep, and which consists of a brief negative high-voltage peak (usually >100µV), followed by a slower positive complex ~350–550ms, and at 900ms a final negative peak.

How do you pronounce "k-complex"?

Pronounced //ˈkeɪˌkɒmplɛks//.

K-complex

//ˈkeɪˌkɒmplɛks// noun

noun ·Rare ·Advanced level

Definitions

Noun

1
A waveform that occurs approximately every 60–100 seconds during stage 2 of NREM sleep, and which consists of a brief negative high-voltage peak (usually >100µV), followed by a slower positive complex ~350–550ms, and at 900ms a final negative peak.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.