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rhythm on the electroencephalogram consisting of theta waves (q.v.). Called also theta activity.Medical dictionary. 2011.
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 — 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 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
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
