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  2. Theta wave - Wikipedia

    en.wikipedia.org/wiki/Theta_wave

    Hippocampal theta waves, with a frequency range of 6–10 Hz, appear when a rat is engaged in active motor behavior such as walking or exploratory sniffing, and also during REM sleep. [3] Theta waves with a lower frequency range, usually around 6–7 Hz, are sometimes observed when a rat is motionless but alert.

  3. Neural oscillation - Wikipedia

    en.wikipedia.org/wiki/Neural_oscillation

    The first discovered and best-known frequency band is alpha activity (8–12 ... The theta-gamma code is a coupling between theta wave and gamma wave in the ...

  4. Electroencephalography - Wikipedia

    en.wikipedia.org/wiki/Electroencephalography

    Theta waves. Theta is the frequency range from 4 Hz to 7 Hz. Theta is seen normally in young children. It may be seen in drowsiness or arousal in older children and adults; it can also be seen in meditation. [86] Excess theta for age represents abnormal activity.

  5. Brainwave entrainment - Wikipedia

    en.wikipedia.org/wiki/Brainwave_entrainment

    Brainwave entrainment is a colloquialism for 'neural entrainment', [25] which is a term used to denote the way in which the aggregate frequency of oscillations produced by the synchronous electrical activity in ensembles of cortical neurons can adjust to synchronize with the periodic vibration of external stimuli, such as a sustained acoustic ...

  6. Large irregular activity - Wikipedia

    en.wikipedia.org/wiki/Large_irregular_activity

    The other field state is that of the theta rhythm. The theta state is characterised by a steady slow oscillation of around 6–7 Hz. LIA has a predominantly lower oscillation frequency but contains some sharp spikes, called sharp waves [1] of a higher frequency than that of theta. [2]

  7. Beat (acoustics) - Wikipedia

    en.wikipedia.org/wiki/Beat_(acoustics)

    It can be proven (with the help of a sum-to-product trigonometric identity) that the sum of two unit-amplitude sine waves can be expressed as a carrier wave of frequency ⁠ f 1 + f 2 / 2 ⁠ whose amplitude is modulated by an envelope wave of frequency ⁠ f 1 - f 2 / 2 ⁠: [3]

  8. The 6 Best High Frequency Wands for Zapping Acne and Wrinkles

    www.aol.com/6-best-high-frequency-wands...

    NuDerma High Frequency Skin Wand. This Amazon bestseller has racked up around 14,000 five-star ratings, a testament to its efficacy. Choose between four different tubes depending on the area you ...

  9. Phase precession - Wikipedia

    en.wikipedia.org/wiki/Phase_precession

    In 1993, O'Keefe and Recce discovered a relationship between the theta wave and the firing patterns of individual place cells. [1] Although the occasional action potentials of cells when rats were outside of the place fields occurred in phase with (at the peaks of) the theta waves, the bursts of more rapid spikes elicited when the rats reached ...

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