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The Cochlea

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

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

Hearing

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Related Experiment Video

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Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback

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Binaural interaction and the octave illusion.

Satu Lamminmäki¹, Anne Mandel, Lauri Parkkonen

¹Brain Research Unit, O.V. Lounasmaa Laboratory, School of Science, Aalto University, P.O. Box 15100, FI-00076 AALTO, Espoo, Finland. satu.lamminmaki@aalto.fi

The Journal of the Acoustical Society of America

|September 18, 2012

Summary

This summary is machine-generated.

The auditory octave illusion involves tones alternating between ears, leading to misperceived pitch and location. Brain recordings reveal altered binaural interactions contribute to this auditory illusion.

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Area of Science:

Auditory Neuroscience
Psychoacoustics
Cognitive Science

Background:

The auditory octave illusion is a perceptual phenomenon where alternating dichotic tones (one octave apart) are mislocalized.
Behavioral studies indicate perceived pitch follows the right ear input, while location follows the higher frequency.

Purpose of the Study:

To investigate the neural basis of the auditory octave illusion.
To explore the relationship between brain activity and the perception of pitch and location in this illusion.

Main Methods:

Magnetoencephalography (MEG) was used to record brain responses to dichotic and monaural tones (400 and 800 Hz).
Ear-specific stimuli were frequency-tagged to differentiate left ear (LE) and right ear (RE) responses.
Analysis focused on brain responses during binaural presentation of tones with varying frequencies and ear assignments.

Main Results:

Dichotic presentation modified binaural interactions, with weaker ipsilateral responses to LE tones and stronger to RE tones compared to monaural stimulation.
During the illusion's most paradoxical condition (high tone LE, low tone RE), contralateral responses to LE tones were diminished.
These findings suggest altered neural processing of binaural auditory information underlies the octave illusion.

Conclusions:

Modified binaural interaction is a key neural mechanism contributing to the auditory octave illusion.
The study links specific patterns of brain activity to the misperception of pitch and location in this auditory phenomenon.