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Related Concept Videos

Hearing

Hearing

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.

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.

Auditory Pathway

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...

Hair Cells

Hair Cells

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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Related Experiment Video

Updated: May 21, 2026

Multi-unit Recording Methods to Characterize Neural Activity in the Locust (Schistocerca Americana) Olfactory Circuits

Multi-unit Recording Methods to Characterize Neural Activity in the Locust (Schistocerca Americana) Olfactory Circuits

Published on: January 25, 2013

Auditory change detection by a single neuron in an insect.

Johannes Schul¹, Anne M Mayo, Jeffrey D Triblehorn

¹Biological Sciences, University of Missouri, 207 Tucker Hall, Columbia, MO 65211, USA. schulj@missouri.edu

Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology

|June 27, 2012

Summary

This summary is machine-generated.

This study reveals how katydids detect rare sounds using auditory interneuron TN-1. Change-detection mechanisms, similar to mammals, are located in the neuron

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Electrophysiological Measurements from a Moth Olfactory System

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Published on: March 29, 2011

Area of Science:

Neuroscience
Auditory Neuroscience
Insect Auditory System

Background:

Auditory systems must detect novel signals amidst background noise.
Neoconocephalus katydids possess a primary auditory interneuron (TN-1) with broad spectral sensitivity.
TN-1 shows preferential responses to rare deviant auditory pulses within a stream of common standard pulses.

Purpose of the Study:

To investigate the neural mechanisms underlying the detection of deviant auditory signals in Neoconocephalus katydids.
To determine the role of inhibitory inputs and receptor cell activity in TN-1's deviant pulse detection.
To compare the change-detection mechanisms in katydids with stimulus-specific adaptation (SSA) in mammalian auditory systems.

Main Methods:

Electrophysiological recordings from the primary auditory interneuron (TN-1) and receptor neurons in Neoconocephalus katydids.
Manipulation of inhibitory inputs to TN-1.
Varying the amplitude and carrier frequencies of standard and deviant auditory pulses.
Analyzing the relationship between receptor cell activity distribution and TN-1 responses.

Main Results:

TN-1 preferentially responded to rare deviant pulses, irrespective of inhibitory input.
Detection thresholds for deviant pulses increased with standard pulse amplitude.
Deviant pulse detection occurred when carrier frequencies differed significantly between standard and deviant pulses.
TN-1 responses depended on the distribution of receptor cell activity, specifically when standard and deviant pulses activated different receptor cell groups.

Conclusions:

The auditory interneuron TN-1 plays a crucial role in detecting deviant auditory signals in katydids.
Change-detection mechanisms, analogous to stimulus-specific adaptation (SSA) in mammals, appear to be located within the TN-1 dendrite.
These findings suggest that the neural basis for detecting novelty in auditory scenes is conserved across different species, including insects and mammals.