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The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the...
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Related Experiment Video

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Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice
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When Sound Stops: Offset Responses in the Auditory System.

Conny Kopp-Scheinpflug1, James L Sinclair2, Jennifer F Linden3

  • 1Division of Neurobiology, Department Biology II, Ludwig-Maximilians-University, Munich, Germany.

Trends in Neurosciences
|October 3, 2018
PubMed
Summary
This summary is machine-generated.

The auditory system encodes sound disappearances (offsets) using distinct pathways from sound appearances (onsets). These sound-offset responses are crucial for processing discontinuous sounds like speech.

Keywords:
ON/OFF asymmetriesgap detectionhearingpost-inhibitory reboundsoundtemporal processing

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Computational Neuroscience

Background:

  • The auditory system processes sound intensity and frequency changes over time.
  • Both sound onsets and sound offsets require neural encoding for accurate auditory perception.
  • Understanding sound-offset processing is key to comprehending temporal aspects of hearing.

Purpose of the Study:

  • To review the computational significance of sound-offset responses.
  • To explore the perceptual roles, anatomical locations, and neural origins of sound-offset responses in the mammalian auditory brain.
  • To differentiate the mechanisms underlying sound-offset and sound-onset responses.

Main Methods:

  • Literature review and synthesis of existing research on auditory processing.
  • Analysis of computational models of auditory system function.
  • Examination of anatomical and physiological studies on neural pathways involved in auditory processing.

Main Results:

  • Sound-offset responses originate from mechanisms and pathways distinct from those for sound-onset responses.
  • These distinct pathways highlight specialized neural processing for sound disappearances.
  • Sound-offset responses are computationally significant and play essential perceptual roles.

Conclusions:

  • Sound-offset responses are critical for the auditory system's ability to process temporally discontinuous sounds.
  • The distinct neural processing of sound offsets and onsets supports sophisticated auditory perception.
  • Further research into sound-offset mechanisms can illuminate speech processing and other complex auditory functions.