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Related Concept Videos

Schemas01:42

Schemas

A schema is a mental construct consisting of a cluster or collection of related concepts (Bartlett, 1932). There are many different types of schemata, and they all have one thing in common: schemata are a method of organizing information that allows the brain to work more efficiently. When a schema is activated, the brain makes immediate assumptions about the person or object being observed.
Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

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:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...
Sensation01:21

Sensation

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.
Absolute thresholds can quantify the sensitivity of sensory...
Perception01:28

Perception

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Gestalt Principles of Perception01:21

Gestalt Principles of Perception

Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
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Factors Affecting Perception

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
09:13

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Published on: April 22, 2015

How behavioral constraints may determine optimal sensory representations.

Emilio Salinas1

  • 1Department of Neurobiology and Anatomy, Wake Forest University School of Medicine, Winston-Salem, North Carolina, United States of America. esalinas@wfubmc.edu

Plos Biology
|November 30, 2006
PubMed
Summary

Neural tuning curve shapes are determined by downstream motor responses, not just stimulus encoding. This explains diverse profiles observed in sensory neurons and their impact on behavior.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Sensory Coding

Background:

  • Neuronal activity is often described by tuning curves, mapping responses to stimulus parameters.
  • Existing theories suggest sensory neuron tuning optimizes information encoding.
  • However, unimodal and monotonic tuning profiles remain unexplained by this.

Purpose of the Study:

  • To investigate factors determining sensory neuron tuning curve shapes.
  • To quantify tuning curve efficacy based on downstream motor responses.
  • To explain the prevalence of different tuning profiles in sensory systems.

Main Methods:

  • Developed a quantitative framework to assess tuning curve efficacy.
  • Analyzed how downstream motor functions influence optimal tuning curve properties.
  • Modeled the impact of tuning curve characteristics on neural circuit output.

Main Results:

  • Optimal tuning curves can be monotonic or nonmonotonic.
  • The proportion of monotonic curves and optimal width depend on downstream function properties.
  • This framework explains features of visual and auditory sensory neurons.

Conclusions:

  • Sensory tuning curves are shaped by downstream neural circuits and behavior, not solely stimulus statistics.
  • Optimal tuning is a balance between stimulus encoding and behavioral utility.
  • This provides a unified explanation for diverse sensory tuning profiles.