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Perception01:28

Perception

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Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
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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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Subliminal perception refers to the processing of sensory information that occurs below the level of conscious awareness. Researchers study subliminal perception by presenting a stimulus, such as a word or image, very quickly, typically around 50 milliseconds. This rapid presentation is often followed by another stimulus, such as a pattern of dots or lines, which blocks further mental processing of the initial stimulus. As a result, if participants cannot identify the initial stimulus better...
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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.
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Automatic processing refers to the cognitive operations that occur without conscious intent or awareness, playing a fundamental role in shaping social cognition and behavior. These processes enable individuals to navigate complex social environments efficiently by relying on mental shortcuts and pre-existing knowledge structures known as schemas. One of the most influential mechanisms underlying automatic processing is priming, which subtly activates mental representations through exposure to...
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Speech perception as an active cognitive process.

Shannon L M Heald1, Howard C Nusbaum1

  • 1Department of Psychology, The University of Chicago Chicago, IL, USA.

Frontiers in Systems Neuroscience
|March 28, 2014
PubMed
Summary
This summary is machine-generated.

Speech perception involves either passive pattern matching or active, attentionally guided processing. Active processing, considering plasticity and context, is crucial for understanding speech in noisy conditions and hearing loss.

Keywords:
active processingattentionlearningpassive processingperceptionspeechtheories of speech perception

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Area of Science:

  • Auditory Neuroscience
  • Cognitive Science
  • Speech Processing

Background:

  • Current speech perception models often overlook the active and plastic nature of early auditory encoding.
  • Theories are increasingly incorporating feedback interactions but need to address the dynamic interplay of context and cognitive resources.

Purpose of the Study:

  • To challenge the passive view of speech perception by highlighting the active, attentionally guided nature of speech analysis.
  • To emphasize the role of plasticity, attention, and listening goals in overcoming hearing challenges.
  • To advocate for a more dynamic, less corticocentric approach to speech perception theories.

Main Methods:

  • Review of existing theories and recent research on speech perception.
  • Analysis of the interplay between feedforward and feedback neural interactions.
  • Examination of cognitive resources like attention, learning, and working memory in speech processing.

Main Results:

  • Speech perception is an active process influenced by attention, context, and experience, not just passive pattern matching.
  • Early auditory encoding is plastic and attentionally guided, crucial for coping with adverse listening conditions.
  • Interactions between brain regions, including descending projections, shape speech perception.

Conclusions:

  • Speech perception theories must integrate active processing and plasticity to fully account for auditory encoding dynamics.
  • Understanding these dynamics offers potential new therapeutic avenues for hearing disorders and loss.
  • A dynamic, context-dependent model is essential for explaining how listeners process ambiguous speech signals.