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Related Concept Videos

Perception of Sound Waves01:01

Perception of Sound Waves

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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Infant Auditory Processing and Event-related Brain Oscillations
06:34

Infant Auditory Processing and Event-related Brain Oscillations

Published on: July 1, 2015

Good vibrations: oscillatory phase shapes perception.

T Neuling1, S Rach, S Wagner

  • 1Experimental Psychology Lab, University of Oldenburg, Ammerländer Heerstr. 114-118, 26111, Oldenburg, Germany.

Neuroimage
|July 28, 2012
PubMed
Summary
This summary is machine-generated.

This study demonstrates that perception is periodic, not continuous. Oscillating transcranial direct current stimulation (α-tDCS) causally linked brainwave phase to auditory detection thresholds, proving brain oscillations modulate perception.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychophysics

Background:

  • Perception is debated as continuous or periodic.
  • Spontaneous brain oscillations are hypothesized as the mechanism for periodic perception.
  • Previous studies show correlation, not causation, between brain oscillation phase and perception.

Purpose of the Study:

  • To establish a causal link between brain oscillation phase and perceptual outcomes.
  • To investigate if external oscillations can entrain brain activity and influence perception.
  • To determine if auditory perception is periodically modulated by brain oscillations.

Main Methods:

  • Human auditory detection experiment.
  • Concurrent electroencephalogram (EEG) recording.
  • Application of 10Hz oscillating transcranial direct current stimulation (α-tDCS) to entrain brain oscillations.

Main Results:

  • Auditory detection thresholds were significantly dependent on the phase of α-tDCS-entrained oscillations.
  • α-power in the EEG increased post-α-tDCS compared to pre-stimulation baseline.
  • Demonstrated a causal relationship between manipulated brain oscillation phase and perceptual performance.

Conclusions:

  • Perception is causally modulated by the phase of brain oscillations.
  • Oscillating transcranial direct current stimulation can be used to investigate the functional role of brain oscillations.
  • Findings support the hypothesis that brain oscillations periodically shape sensory perception.