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  2. Relaxation (psychology) - Wikipedia

    en.wikipedia.org/wiki/Relaxation_(psychology)

    In psychology, relaxation is the emotional state of low tension, in which there is an absence of arousal, particularly from negative sources such as anger, anxiety, or fear. [2] Relaxation is a form of mild ecstasy coming from the frontal lobe of the brain in which the backward cortex sends signals to the frontal cortex via a mild sedative.

  3. Audio-visual entrainment - Wikipedia

    en.wikipedia.org/wiki/Audio-Visual_Entrainment

    Another clinical study showed declines in depression, anxiety and suicidal ideation following a treatment program using AVE. [12] A study by Berg and Siever used audio-visual entrainment devices on women with seasonal affective disorder. Both depression and anxiety symptoms were reduced in participants, as compared to a placebo phase.

  4. Infrasound - Wikipedia

    en.wikipedia.org/wiki/Infrasound

    The study of such sound waves is sometimes referred to as infrasonics, covering sounds beneath 20 Hz down to 0.1 Hz (and rarely to 0.001 Hz). People use this frequency range for monitoring earthquakes and volcanoes, charting rock and petroleum formations below the earth, and also in ballistocardiography and seismocardiography to study the ...

  5. Brain activity and meditation - Wikipedia

    en.wikipedia.org/wiki/Brain_activity_and_meditation

    Highlighted region shows the anterior cingulate cortex, a region of the brain shown to be activated during meditation. Meditation and its effect on brain activity and the central nervous system became a focus of collaborative research in neuroscience, psychology and neurobiology during the latter half of the 20th century. Research on meditation ...

  6. Mind machine - Wikipedia

    en.wikipedia.org/wiki/Mind_machine

    A mind machine (aka brain machine or light and sound machine) uses pulsing rhythmic sound, flashing light, or a combination of these. Mind machines can induce deep states of relaxation [1] or concentration. [2] The process applied by some of these machines is said to induce brainwave synchronisation or entrainment. [3]

  7. Neural encoding of sound - Wikipedia

    en.wikipedia.org/wiki/Neural_encoding_of_sound

    Graph of a simple sine wave. Amplitude is the size (magnitude) of the pressure variations in a sound wave, and primarily determines the loudness with which the sound is perceived. In a sinusoidal function such as ⁡ (), C represents the amplitude of the sound wave.

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