- published: 18 Sep 2015
- views: 139258
The theta rhythm is an oscillatory pattern in EEG signals recorded either from inside the brain or from electrodes glued to the scalp. Two types of theta rhythm have been described. The "hippocampal theta rhythm" is a strong oscillation that can be observed in the hippocampus and other brain structures in numerous species of mammals including rodents, rabbits, dogs, cats, bats, and marsupials. "Cortical theta rhythms" are low-frequency components of scalp EEG, usually recorded from humans.
In rats, the most frequently studied species, theta rhythmicity is easily observed in the hippocampus, but can also be detected in numerous other cortical and subcortical brain structures. Hippocampal theta, with a frequency range of 6–10 Hz, appears when a rat is engaged in active motor behavior such as walking or exploratory sniffing, and also during REM sleep. Theta waves with a lower frequency range, usually around 6–7 Hz, are sometimes observed when a rat is motionless but alert. When a rat is eating, grooming, or sleeping, the hippocampal EEG usually shows a non-rhythmic pattern known as Large Irregular Activity or LIA. The hippocampal theta rhythm depends critically on projections from the medial septal area, which in turn receives input from the hypothalamus and several brainstem areas. Hippocampal theta rhythms in other species differ in some respects from those in rats. In cats and rabbits, the frequency range is lower (around 4–6 Hz), and theta is less strongly associated with movement than in rats. In bats, theta appears in short bursts associated with echolocation. In humans and other primates, hippocampal theta is difficult to observe at all.
8 Hours Powerful Healing Theta Waves for: Deep Meditation, Improve Memory, DNA Repair, Sleep
PURE THETA WAVES: Meditation (Track: Cosmic Theta Waves)
PURE THETA WAVES: Meditation (Track: Cosmic Theta Waves)
8 Hour Sleep Music Theta Waves: Relaxing Meditation Music for Deep Sleep with Binaural Waves ☯011
8 Hours Sleep Music | Space Ambient with Theta Waves | Background Deep Meditation, Stress Relief
8 Hour Deep Sleep Music Theta Waves: Sleep Music, Calming Music, Soothing Music ☯131
Binaural Beat - Theta Wave | 100% Pure Theta Frequency |
3 HOURS Astral Projection: Theta Waves ☯ Isochronic Tones Meditation Binaural Beats
8 Hour Sleep Music Theta Waves: Deep Sleep Meditation, Sleep Music to Beat Insomnia ☯219
1hr Theta Binaural Beat Session (7hz) ~ Pure
DNA Repair Frequency | Healing Theta Meditation | Cell Regeneration w/ Binaural Beats
Boost Your Creativity - Binaural Beat Music with Theta Waves to Enhance Concentration
WARNING! Extremely Powerful Brain Wave Theta Brain Waves & Delta Waves White Noise
4 HOURS of ULTRA DEEP RELAXATION. Binaural Beat (432Hz Music) Theta Wave