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Related Concept Videos

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...
Auditory Pathway01:15

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
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...

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Related Experiment Video

Updated: Jun 14, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Gaze-Direction-Based MEG Averaging During Audiovisual Speech Perception.

Lotta Hirvenkari1, Veikko Jousmäki, Satu Lamminmäki

  • 1Brain Research Unit, Low Temperature Laboratory, Aalto University School of Science and Technology Espoo, Finland.

Frontiers in Human Neuroscience
|March 20, 2010
PubMed
Summary

This study recorded brain activity using magnetoencephalography (MEG) and gaze direction during speech perception. Results show brain responses differ for congruent versus incongruent audiovisual speech, validating gaze-based MEG signal analysis.

Keywords:
McGurk illusionauditory cortexeye trackinghumanmagnetoencephalography

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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

Published on: October 24, 2012

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Last Updated: Jun 14, 2026

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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
08:45

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

Published on: October 24, 2012

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Audiovisual Speech Perception

Background:

  • Understanding how the brain processes audiovisual speech is crucial for cognitive neuroscience.
  • Previous research often uses artificial viewing conditions, limiting real-world applicability.
  • Simultaneous recording of brain activity and eye movements offers a more ecologically valid approach.

Purpose of the Study:

  • To investigate audiovisual speech perception using simultaneous magnetoencephalography (MEG) and gaze tracking.
  • To assess the feasibility of gaze-based averaging of MEG signals in realistic viewing scenarios.
  • To examine neural responses to congruent and incongruent audiovisual speech stimuli.

Main Methods:

  • Simultaneous recording of magnetoencephalography (MEG) signals and subject gaze direction.
  • Presentation of congruent (/apa/ on /apa/) and incongruent (/apa/ on /aka/) audiovisual speech stimuli.
  • Gaze-based averaging of MEG responses categorized by viewed face.

Main Results:

  • A significant reduction (approximately 20%) in the right-hemisphere 100-ms response (N100m') to incongruent stimuli compared to congruent stimuli.
  • Demonstration of differential neural processing based on auditory-visual congruence.
  • Successful implementation of gaze-based averaging for MEG data analysis.

Conclusions:

  • Realistic viewing conditions, including free gaze choice, are feasible for MEG studies.
  • Gaze-based averaging of MEG signals is a viable method for analyzing brain responses during naturalistic audiovisual perception.
  • The brain exhibits distinct neural responses to congruent and incongruent audiovisual speech, highlighting the integration of sensory information.