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Somatosensation

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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Sensory receptors are specialized neurons that respond to specific types of external stimuli, initiating the process known as sensation. This occurs when sensory input, such as light entering the eye, is detected by these receptors, causing chemical changes in the cells of the retina. These cells then convert the sensory stimulus into action potentials that are transmitted to the central nervous system, a process termed transduction.
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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 somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
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Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder
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Unmet expectations delay sensory processes.

Buse M Urgen1, Huseyin Boyaci2

  • 1Interdisciplinary Neuroscience Program, Bilkent University, Ankara, 06800, Turkey; Aysel Sabuncu Brain Research Center & National Magnetic Resonance Research Center (UMRAM), Bilkent University, Ankara, 06800, Turkey.

Vision Research
|January 5, 2021
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Summary
This summary is machine-generated.

Expectations influence perception. When sensory information violates expectations, perceptual decision-making is delayed, requiring longer processing times. This effect is explained by a computational model.

Keywords:
Bayesian theoremExpectationPerceptual inferencePredictionPredictive processingVisual perception

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Area of Science:

  • Cognitive Neuroscience
  • Computational Neuroscience
  • Psychology

Background:

  • Expectations significantly impact perceptual decision-making, influencing speed and interpretation of noisy stimuli.
  • The effect of expectations on low-level sensory processing remains largely unexplored.

Purpose of the Study:

  • To investigate how expectations affect temporal thresholds in sensory individuation tasks.
  • To determine if violated expectations delay sensory processing.

Main Methods:

  • An individuation task involving the detection of image position (house or face) was used.
  • Temporal thresholds were measured under expected and unexpected stimulus conditions.
  • A recursive Bayesian model with dynamic priors was employed to analyze the data.

Main Results:

  • Temporal thresholds increased when images belonged to an unexpected category compared to a neutral baseline.
  • Thresholds remained unchanged when images matched the expected category.
  • A computational model indicated that violated expectations lead to delayed sensory processing due to additional computation, not altered internal parameters.

Conclusions:

  • Sensory processing is delayed when expectations are violated.
  • This delay is a consequence of extended processing time required to resolve unexpected stimuli.
  • A parsimonious computational model effectively explains the observed effects of expectation on sensory processing.