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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.

Anatomy of the Ear

Anatomy of the Ear

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...

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.

Echo

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...

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: Jun 12, 2025

A Lightweight, Headphones-based System for Manipulating Auditory Feedback in Songbirds

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Published on: November 26, 2012

Intelligent Song Recognition via a Hollow-Microstructure-Based, Ultrasensitive Artificial Eardrum.

Shaopeng Li¹, Jiangtao Tian², Ke Li¹

¹State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|September 20, 2024

Summary

This summary is machine-generated.

Researchers developed ultrasensitive artificial eardrums using novel geometric engineering. These intelligent devices can recognize complex songs with high accuracy, paving the way for advanced human-machine interaction.

Keywords:

acoustic sensor artificial eardrum hollow microstructure piezoresistive sensor song recognition

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Area of Science:

Materials Science
Acoustics
Artificial Intelligence

Background:

Current flexible sound sensors have limited capabilities, often restricted to recognizing simple phonemes due to insufficient sensitivity.
Developing artificial ears with intelligence requires advanced sound detection and sophisticated processing for complex auditory information.

Purpose of the Study:

To construct ultrasensitive artificial eardrums capable of intelligent song recognition.
To enhance sound detection sensitivity and processing capabilities for complex acoustic signals.

Main Methods:

Novel geometric engineering of sensing units in a soft microstructure array to reduce effective modulus.
Utilizing machine learning algorithms for complex song recognition.
Fabrication of a sensor with a hollow pyramid architecture and porous slants.

Main Results:

Achieved unprecedented pressure sensitivity of 6.9 × 10^3 kPa^-1.
Demonstrated sound detection sensitivity exceeding reported benchmarks by 1-2 orders of magnitude.
Accurately identified 100% of training songs and 97.7% of test songs from a diverse database.

Conclusions:

The hollow-microstructure-based artificial eardrum exhibits outstanding performance in sound detection and intelligent recognition.
This technology holds significant potential for applications in human-machine interaction and wearable acoustical devices.
The study showcases a breakthrough in sensitive artificial hearing and complex auditory processing.