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The Cochlea01:13

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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Hearing01:31

Hearing

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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Perception of Sound Waves01:01

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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...
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Hair Cells01:22

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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Anatomy of the Ear01:16

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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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Updated: Apr 28, 2026

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Specific differences in sound production and pattern recognition in tettigoniids.

M Jatho1, J Schul, O Stiedl

  • 1AG Neurobiologie, FB Biologie-Zoologie, Philipps-Universität, 35032 Marburg, FRG.

Behavioural Processes
|June 14, 2014
PubMed
Summary
This summary is machine-generated.

This study characterizes tettigoniid (katydid) songs using four parameters. The impulse pattern of closing syllables guides Ephippiger ephippiger, while syllable patterns are key for Tettigonia viridissima species recognition.

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Area of Science:

  • Bioacoustics
  • Animal Behavior
  • Insect Communication

Background:

  • Tettigoniid (katydid) stridulatory songs exhibit species-specific temporal patterns.
  • Understanding these acoustic signals is crucial for insect communication and reproductive success.

Purpose of the Study:

  • To introduce a set of four parameters for characterizing tettigoniid song temporal patterns.
  • To investigate the role of specific song parameters in female phonotaxis for two tettigoniid species.

Main Methods:

  • Comparative analysis of stridulatory songs from nine tettigoniid species.
  • Two-choice phonotaxis experiments with Ephippiger ephippiger and Tettigonia viridissima females.

Main Results:

  • Four parameters (phase, repetition mode, similarity, impulse pattern) were defined for song characterization.
  • Ephippiger ephippiger females used the impulse pattern of closing syllables for phonotaxis.
  • Tettigonia viridissima females relied on syllable patterns for species discrimination.

Conclusions:

  • The impulse pattern of closing syllables is critical for Ephippiger ephippiger's phonotactic behavior.
  • Syllable patterns serve as a decisive factor for species recognition in Tettigonia viridissima.
  • Temporal song parameters play distinct roles in mate choice and species recognition within tettigoniids.