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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
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Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
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Touch: Fluctuating Waves of Perception.

Jinho Kim1, Samuel Andrew Hires1

  • 1Department of Biological Sciences, Section of Neurobiology, University of Southern California, Los Angeles, CA 90089, USA.

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|August 19, 2020
PubMed
Summary
This summary is machine-generated.

New research reveals that tactile sensory information travels in waves, not a stream. This brain activity synchronizes with the rhythmic motion of whiskers during exploration.

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Area of Science:

  • Neuroscience
  • Sensory processing
  • Somatosensation

Background:

  • The precise temporal dynamics of sensory information processing in the brain remain incompletely understood.
  • Existing models debate whether sensory input is continuous (stream) or episodic (waves).

Purpose of the Study:

  • To investigate the temporal patterns of tactile information processing in the cerebral cortex.
  • To determine if sensory input is conveyed as a continuous stream or in discrete waves.

Main Methods:

  • Electrophysiological recordings from the somatosensory cortex during active whisker-mediated surface exploration in rodents.
  • Analysis of neural activity patterns in relation to whisker movement kinematics.

Main Results:

  • Tactile information in the cortex exhibits cyclical fluctuations.
  • These neural oscillations are precisely phase-locked to the forward and backward movements of the whiskers.
  • This suggests a wave-like, rather than stream-like, transmission of tactile data.

Conclusions:

  • Sensory input, specifically tactile information, is processed in the brain in a wave-like manner.
  • This rhythmic processing is coupled with the motor actions of exploration, suggesting a tight integration of sensation and movement.