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Related Concept Videos

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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Vision01:24

Vision

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Visual System01:26

Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
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What is a Sensory System?01:31

What is a Sensory System?

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Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.
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Overview of Somatic Sensory Pathways01:29

Overview of Somatic Sensory Pathways

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Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
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Higher Mental Functions of the Brain: Language01:10

Higher Mental Functions of the Brain: Language

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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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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
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Neural pathways for visual speech perception.

Lynne E Bernstein1, Einat Liebenthal2

  • 1Department of Speech and Hearing Sciences, George Washington University Washington, DC, USA.

Frontiers in Neuroscience
|December 19, 2014
PubMed
Summary
This summary is machine-generated.

Visual speech perception is possible across all linguistic levels, from sounds to sentences. The brain processes visual speech in specialized visual areas, not auditory pathways, with the temporal visual speech area (TVSA) playing a key role.

Keywords:
audiovisual processingfunctional organizationlipreadingspeech perceptionvisual processing

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Area of Science:

  • Neuroscience
  • Psycholinguistics
  • Vision Science

Background:

  • The ability to perceive speech visually is a key aspect of human communication.
  • Understanding how the brain processes visual speech information is crucial for explaining speech perception.
  • Existing research has explored various facets of visual speech, but a comprehensive model of its neural representation is still developing.

Purpose of the Study:

  • To investigate which levels of speech can be perceived visually.
  • To determine how the brain represents visual speech.
  • To propose a model for the neural pathways involved in visual speech processing.

Main Methods:

  • Literature review of psycholinguistic and neuroimaging studies.
  • Analysis of visual processing pathways (ventral and dorsal).
  • Examination of visual processing related to faces, bodies, orthography, and sign language.

Main Results:

  • All levels of speech structure (phonetic features, phonemes, syllables, words, prosody) are visually perceptible.
  • Visual speech is represented in modality-specific visual brain areas, not primarily auditory pathways.
  • Evidence suggests a 'temporal visual speech area' (TVSA) in the posterior temporal cortex.

Conclusions:

  • Visual speech perception relies on dedicated visual pathway representations.
  • The TVSA is a proposed neural substrate for integrating dynamic and configural visual speech features.
  • Future research should further elucidate the role of TVSA in visual speech processing.