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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.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same frequency...
Auditory Perception01:17

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...

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Related Experiment Video

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Video-oculography in Mice
09:43

Video-oculography in Mice

Published on: July 19, 2012

Mu rhythm modulation during changes of visual percepts.

S Vanni1, K Portin, V Virsu

  • 1Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland.

Neuroscience
|May 21, 1999
PubMed
Summary

Visual perception changes, even without movement, alter brain activity. This study links visual percept shifts during binocular rivalry to changes in sensorimotor mu rhythm, suggesting visuomotor network involvement.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • The visual and sensorimotor systems exhibit functional coupling, evident in behaviors like manual object exploration.
  • Binocular rivalry presents a unique paradigm to study interactions between visual perception and sensorimotor processing.

Purpose of the Study:

  • To investigate the relationship between changes in visual perception during binocular rivalry and sensorimotor mu rhythm activity.
  • To determine if altered visual percepts, independent of motor responses, modulate neural activity in the sensorimotor system.

Main Methods:

  • Human volunteers underwent whole-scalp neuromagnetometry to monitor sensorimotor mu rhythm.
  • Participants viewed competing gratings under binocular rivalry conditions, with controlled visual motion stimuli.
  • Mu rhythm levels were analyzed in relation to perceptual dominance shifts.

Main Results:

  • A transient increase (10-15%) in the postcentral 8- to 15-Hz mu rhythm was observed approximately 450 ms after movement onset, coinciding with a shift in visual dominance.
  • Mu rhythm enhancement also occurred when the dominant stimulus disappeared, irrespective of the rivalry stimulus.
  • Visual motion without a perceptual change elicited only minor effects on the mu rhythm.

Conclusions:

  • Changes in visual perception, even without overt motor actions, are associated with modified activity in the postcentral gyrus.
  • These findings suggest potential visuohaptic interactions or the involvement of cortical networks underlying visually guided movements.