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Auditory motion processing after early blindness.

Fang Jiang1, G Christopher Stecker2, Ione Fine1

  • 1Department of Psychology, University of Washington, Seattle, WA, USA.

Journal of Vision
|November 8, 2014
PubMed
Summary
This summary is machine-generated.

Early blind individuals "see" auditory motion, with brain activity in the human middle temporal complex (hMT+) linked to auditory motion perception. This suggests hMT+ may take over functions typically handled by other brain areas in sighted individuals.

Keywords:
blindnesscross-modalmotionvisual deprivation

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Area of Science:

  • Neuroscience
  • Sensory processing
  • Visual cortex plasticity

Background:

  • Occipital cortex activation in response to non-visual stimuli in early blindness is debated.
  • The role of these occipital responses in direct perception versus modulation is unclear.

Purpose of the Study:

  • To investigate whether early blind individuals experience "seeing" auditory motion.
  • To determine the neural correlates of auditory motion perception in early blindness.

Main Methods:

  • fMRI pattern classification was used to decode perceived motion direction from auditory stimuli.
  • Neural responses in sighted and early blind individuals were analyzed.

Main Results:

  • In sighted individuals, auditory motion perception was decoded from the planum temporale (PT) and right lateral occipital cortex (LOC).
  • In early blind individuals, auditory motion perception was decoded from the human middle temporal complex (hMT+), but not PT or LOC.
  • hMT+ responses in the early blind were associated with auditory motion perception.

Conclusions:

  • Early blind individuals demonstrate "seeing" of auditory motion.
  • The human middle temporal complex (hMT+) plays a crucial role in auditory motion perception in early blindness.
  • hMT+ may functionally replace the role of deprived visual areas like PT in auditory motion processing.