Theta waves
10-31-2021: Neural Oscillations
Theta waves #
- (4 - 8 Hz)
- Creativity, hypnagogia, deep relaxation/meditation, visualization. The predominant cortical frequency during REM in both humans and rats.
Should be no mystery to me it’s implicated in hippocamal processes. I think it has a role in slowing things down to keep many things in working memory at once. Temporal (and sometimes frontal) theta is a bit of a biomarker of hippocampal activity.
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The more time somebody spends on-task, theta rises to match any increased fatigue.
- However, theta also increases during deep, relaxing Meditation - but it’s apparently mostly in left frontal/central sites.
R Thus, whole-brain theta would be a better marker.
- Lost in thoughts: Neural markers of low alertness during mind wandering: a way of discriniminating meditative releaxation and fatigue would be seeing if there’s a concomitant Delta waves increase or not, which would indicate fatigue (which, still is not perfect)
- Fz, F3, F4, Cz, and C3 theta dominance during some this Kevin Schoeninger guy’s non-dual consciousness experience. R
- However, theta also increases during deep, relaxing Meditation - but it’s apparently mostly in left frontal/central sites.
R Thus, whole-brain theta would be a better marker.
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Theta synchronization can either be characterized by a narrow-frequency power increase - or irregular slow activity AKA large irregular activity, which is a tonic increase at large during Sleep, etc., which is quite distinct from phasic narrow band synchronization that characterizes memory encoding/recall (or during REM, recoding). ISA/LIA probably inhibits memory, which clearly explains why you don’t remember much during sleep.