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Related Concept Videos

Auditory Perception01:17

Auditory Perception

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 cochlea, a...
Language Development01:22

Language Development

Children master language quickly and with relative ease, supported by both biological predisposition and reinforcement. B. F. Skinner (1957) proposed that language is learned through reinforcement, while Noam Chomsky (1965) argued that language acquisition mechanisms are biologically determined.
The critical period for language acquisition suggests that the ability to acquire language is at its peak early in life. As people age, this proficiency decreases. Language development begins very...
Non-Verbal Cues01:29

Non-Verbal Cues

Non-verbal communication extends beyond gestures and facial expressions to include vocal elements known as paralanguage. Paralanguage consists of non-verbal vocal cues such as pitch, loudness, speech rate, pauses, and non-verbal vocalizations like laughter, sighs, and moans. These elements not only accompany speech but also provide critical emotional and contextual information.The Role of Paralanguage in CommunicationParalanguage adds depth to spoken language by conveying emotions and...
Perception of Sound Waves01:01

Perception of Sound Waves

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 frequency...
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
Higher Mental Functions of the Brain: Language01:10

Higher Mental Functions of the Brain: Language

Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
Language formation and comprehension take place in the dominant hemisphere. The dominant hemisphere is responsible for understanding the meaning of spoken, written, or sign language, as well as the ability to communicate. For most people, the left hemisphere is the dominant one. The right hemisphere, then, gives tone and emotional context to the...

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Pupillometry to Assess Auditory Sensation in Guinea Pigs
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Speech perception: a language-trained chimpanzee weighs in.

W Tecumseh Fitch1

  • 1Department of Cognitive Biology, University of Vienna, 14 Althanstrasse, A-1090 Vienna, Austria. tecumseh.fitch@univie.ac.at

Current Biology : CB
|July 26, 2011
PubMed
Summary

A language-trained chimpanzee understood artificial speech sounds, suggesting that basic human speech perception relies on ancient auditory processing abilities that existed before spoken language evolved.

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Area of Science:

  • Primate cognition
  • Auditory perception
  • Evolution of language

Background:

  • Human speech perception is complex, involving specialized neural mechanisms.
  • The evolutionary origins of these mechanisms are not fully understood.
  • Investigating non-human primate auditory capabilities can offer insights into shared ancestral traits.

Purpose of the Study:

  • To determine if a language-trained chimpanzee can interpret synthetic speech stimuli.
  • To explore the role of general auditory mechanisms in speech perception.
  • To investigate the evolutionary precursors to human speech perception.

Main Methods:

  • A language-trained chimpanzee was exposed to synthetic 'auditory caricatures' designed to mimic speech patterns.
  • The chimpanzee's responses were analyzed to assess comprehension of these artificial sounds.
  • Behavioral and cognitive assessments were employed to evaluate auditory processing abilities.

Main Results:

  • The chimpanzee successfully interpreted the synthetic auditory caricatures as meaningful speech.
  • This indicates that the chimpanzee could generalize auditory information to a speech-like format.
  • The findings suggest a capacity for processing speech-relevant acoustic features.

Conclusions:

  • General auditory mechanisms, not exclusive to human language, are fundamental to speech perception.
  • These foundational auditory abilities likely predated the evolution of spoken language.
  • Chimpanzee auditory processing may share significant commonalities with human speech perception mechanisms.