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Related Concept Videos

Auditory Perception01:17

Auditory Perception

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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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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The Auditory Ossicles01:11

The Auditory Ossicles

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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
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Auditory Pathway01:15

Auditory Pathway

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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...
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Anatomy of the Ear01:16

Anatomy of the Ear

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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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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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Related Experiment Video

Updated: Mar 29, 2026

Simple Surgical Induction of Conductive Hearing Loss with Verification Using Otoscope Visualization and Behavioral Clap Startle Response in Rat
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Early hominin auditory capacities.

Rolf Quam1, Ignacio Martínez2, Manuel Rosa3

  • 1Department of Anthropology, Binghamton University [State University of New York (SUNY)], Binghamton, NY 13902-6000, USA. ; Centro de Investigación (UCM-ISCIII) sobre Evolución y Comportamiento Humanos, Avda. Monforte de Lemos, 5, 28029 Madrid, Spain. ; Division of Anthropology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA.

Science Advances
|November 25, 2015
PubMed
Summary
This summary is machine-generated.

Early hominin auditory capacities, including Australopithecus africanus and Paranthropus robustus, show adaptations for higher frequencies, suggesting enhanced short-range vocal communication in open environments.

Keywords:
AustralopithecusParanthropusauditioncommunicationearevolutionsensory ecology

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Area of Science:

  • Paleoanthropology
  • Evolutionary Biology
  • Bioacoustics

Background:

  • Studying fossil sensory capacities offers insights into ancient adaptations.
  • Audition is particularly suitable for fossil study due to its link with skeletal anatomy.

Purpose of the Study:

  • To investigate the auditory capacities of early hominins, Australopithecus africanus and Paranthropus robustus.
  • To compare their auditory anatomy and hearing sensitivity with modern humans and chimpanzees.

Main Methods:

  • Anatomical analysis of the outer and middle ear structures in fossil specimens.
  • Estimation of auditory capacities based on skeletal morphology.

Main Results:

  • Early hominins exhibit derived traits (shorter/wider ear canal, smaller tympanic membrane, lower malleus/incus ratio) but retain primitive features (small stapes footplate).
  • Compared to chimpanzees, both taxa show heightened sensitivity to frequencies between 1.5–3.5 kHz, shifted towards higher frequencies.

Conclusions:

  • The auditory pattern of early hominins suggests adaptations for enhanced short-range vocal communication.
  • These adaptations may have been crucial for communication in open habitats, influencing social behavior and ecology.