theta rhythm
noun Date: 1944 a relatively high amplitude brain wave pattern between approximately four and nine hertz that is characteristic especially of the hippocampus — called also theta wave

New Collegiate Dictionary. 2001.

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  • Theta rhythm — Theta rhythms are one of several characteristic electroencephalogram (EEG) waveforms associated with various sleep and wakefulness states of the brain. When measured in this fashion, they are between 4 and 8 Hz, and involve many neurons firing… …   Wikipedia

  • theta rhythm — the·ta rhythm thāt ə , Brit usu thēt ə n a relatively high amplitude brain wave pattern between approximately 4 and 9 hertz that is characteristic esp. of the hippocampus but occurs in many regions of the brain including the cortex called also… …   Medical dictionary

  • theta rhythm — noun the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude • Syn: ↑theta wave • Hypernyms: ↑brainwave, ↑brain wave, ↑cortical potential * * * noun or …   Useful english dictionary

  • theta rhythm — noun Physiology electrical activity observed in the brain under certain conditions, consisting of oscillations (theta waves) with a frequency of 4 to 7 hertz …   English new terms dictionary

  • theta rhythm — the′ta rhythm n. phl a pattern of brain waves(the′ta waves )with a frequency of 4 to 7 hertz, occurring during light sleep • Etymology: 1945–50 …   From formal English to slang

  • theta rhythm — Physiol. a pattern of brain waves having a regular frequency of 4 to 7 cycles per second as recorded by an electroencephalograph, observed during various states of light sleep or arousal. [1945 50] * * * …   Universalium

  • theta rhythm — noun A type of electrical activity in the brain, brain waves with a frequency 4 8 hertz …   Wiktionary

  • theta wave — n. any of the electrical brain waves having a frequency between four and eight hertz and associated with a drowsy, semiconscious state of mind: also theta rhythm …   English World dictionary

  • theta wave — noun the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude • Syn: ↑theta rhythm • Hypernyms: ↑brainwave, ↑brain wave, ↑cortical potential * * * noun see thet …   Useful english dictionary

  • theta — noun Etymology: Middle English, from Latin, from Greek thēta, of Semitic origin; akin to Hebrew ṭēth teth Date: 15th century 1. the 8th letter of the Greek alphabet see alphabet table 2. theta rhythm …   New Collegiate Dictionary

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