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  2. Psychoacoustics - Wikipedia

    en.wikipedia.org/wiki/Psychoacoustics

    For example, the interference of two pitches can often be heard as a repetitive variation in the volume of the tone. This amplitude modulation occurs with a frequency equal to the difference in frequencies of the two tones and is known as beating. The semitone scale used in Western musical notation is not a linear frequency scale but logarithmic.

  3. Hypersonic effect - Wikipedia

    en.wikipedia.org/wiki/Hypersonic_effect

    Studies cited as contrary evidence did not address the physiological brain response to high-frequency audio, only the subject's conscious response to it. Further investigation of the observed physiological response appears to show that the ear alone does not produce the extra brain waves, [ 12 ] but when the body is exposed to high-frequency ...

  4. Critical band - Wikipedia

    en.wikipedia.org/wiki/Critical_band

    [6] [7] The ERB can be converted into a scale that relates to frequency and shows the position of the auditory filter along the basilar membrane. For example, ERB = 3.36 Hz corresponds to a frequency at the apical end of the basilar membrane, whereas ERB = 38.9 Hz corresponds to the base, and a value of 19.5 Hz falls half-way between the two. [6]

  5. Neuronal noise - Wikipedia

    en.wikipedia.org/wiki/Neuronal_noise

    Neuronal activity at the microscopic level has a stochastic character, with atomic collisions and agitation, that may be termed "noise." [4] While it isn't clear on what theoretical basis neuronal responses involved in perceptual processes can be segregated into a "neuronal noise" versus a "signal" component, and how such a proposed dichotomy could be corroborated empirically, a number of ...

  6. Sound - Wikipedia

    en.wikipedia.org/wiki/Sound

    In human physiology and psychology, sound is the reception of such waves and their perception by the brain. [1] Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans.

  7. Auditory illusion - Wikipedia

    en.wikipedia.org/wiki/Auditory_illusion

    Hearing a missing fundamental frequency, given other parts of the harmonic series; Various psychoacoustic tricks of lossy audio compression; McGurk effect; Octave illusion/Deutsch's high–low illusion; Auditory pareidolia: hearing indistinct voices in random noise. The Shepard–Risset tone or scale, and the Deutsch tritone paradox; Speech-to ...

  8. 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 ...

  9. High-frequency oscillations - Wikipedia

    en.wikipedia.org/wiki/High-frequency_oscillations

    Traditional classification of the frequency bands, that are associated to different functions/states of the brain and consist of delta, theta, alpha, beta and gamma bands. . Due to the limited capabilities of the early experimental/medical setup to record fast frequencies, for historical reason, all oscillations above 30 Hz were considered as high frequency and were difficult to investigate.