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The Cochlea

The Cochlea

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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Related Experiment Video

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Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach

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Masking by harmonic complexes in birds: behavioral thresholds and cochlear responses.

R J Dooling¹, M L Dent, M R Leek

¹Department of Psychology, University of Maryland, College Park, MD 20742, USA. dooling@psyc.umd.edu

Hearing Research

|February 27, 2001

Summary

Bird hearing differs from human hearing when distinguishing pure tones in complex sounds. Masking patterns in birds align with their auditory system

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Area of Science:

Auditory Neuroscience
Animal Bioacoustics
Comparative Physiology

Background:

Harmonic complex sounds are common in natural environments.
The Schroeder-phase algorithm creates harmonic complexes with distinct phase characteristics.
Previous research indicated species-specific differences in auditory masking using these stimuli, particularly between humans and budgerigars.

Purpose of the Study:

To investigate pure-tone masking in harmonic complexes across multiple avian species and gerbils.
To compare behavioral and physiological masking thresholds.
To explore the relationship between masking patterns, frequency selectivity, and temporal processing.

Main Methods:

Behavioral audiometry and auditory evoked potential (AEP) measurements were used.
Pure tones were embedded in Schroeder-phase harmonic complex maskers (increasing and decreasing phase).
Measurements were conducted on three bird species and gerbils.

Main Results:

Two additional bird species exhibited masking patterns similar to budgerigars, showing minimal differences between the two Schroeder-phase maskers.
Avian masking patterns contrasted with human responses, with differences in the opposite direction.
Masking levels correlated with species-specific critical ratios.
AEP measurements in birds and gerbils were consistent with behavioral thresholds.

Conclusions:

Avian auditory systems process complex harmonic sounds differently than human auditory systems.
Differences in frequency selectivity and cochlear temporal processing likely underlie the observed species-specific masking patterns.
Comparative studies are crucial for understanding the evolution and diversity of auditory perception.