Also found in: Thesaurus, Medical, Legal, Financial, Encyclopedia, Wikipedia.
Related to theta wave: beta waves
1. An electrical oscillation occurring in the human brain at a frequency of about 4 to 8 hertz or less as recorded on an electroencephalogram, possibly associated with memory and navigation.
2. A similar brain wave occurring in rodents chiefly in the hippocampus, having a frequency range of about 4 to 10 hertz and associated with a state of alert arousal. In both senses also called theta rhythm.
Switch to new thesaurus
|Noun||1.||theta wave - the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude|