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Related Experiment Videos

Cortical neurons that localize sounds.

John C Middlebrooks1, Li Xu, Shigeto Furukawa

  • 1Kresge Hearing Research Institute, University of Michigan, Ann Arbor 48109-0506, USA. jmidd@umich.edu

The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry
|February 15, 2002
PubMed
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Auditory cortex neurons do not have a precise spatial map. Instead, temporal firing patterns within large receptive fields encode sound source locations across 360 degrees of auditory space.

Area of Science:

  • Neuroscience
  • Auditory Perception
  • Computational Neuroscience

Background:

  • Cortical maps of auditory space are difficult to identify.
  • Cortical neurons typically exhibit large or unbounded spatial receptive fields at moderate sound levels.

Purpose of the Study:

  • To investigate how auditory cortical neurons represent sound source locations.
  • To explore the relationship between neural firing patterns and sound localization behavior.

Main Methods:

  • Recording neural activity in the cat's auditory cortex.
  • Presenting broad-band and filtered sounds to elicit localization and illusions.
  • Comparing neural responses to behavioral data and predictive models.

Main Results:

Related Experiment Videos

  • Single-neuron firing patterns systematically change with sound location across 360 degrees.
  • Cat auditory cortex neurons accurately localize broad-band sounds, mirroring human perception.
  • Neurons signal predictable, incorrect locations for sounds causing human spatial illusions.

Conclusions:

  • Auditory space is not represented by a simple cortical map.
  • Sound source location is encoded by distributed patterns of neural activity within and across auditory cortical areas.
  • Temporal firing dynamics within large receptive fields are crucial for auditory spatial representation.