theta wavetheta wave
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
- 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.
- 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. Also called In both senses also called theta rhythm .
(plural theta waves)
- A type of electrical activity in the brain; brain waves with a frequency of 4-8 hertz.