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Related Concept Videos

Pain01:20

Pain

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Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...
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Factors Affecting Perception01:25

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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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Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.
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Color Vision01:24

Color Vision

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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Blind Procedures02:07

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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
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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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Related Experiment Video

Updated: Jun 10, 2025

Optimizing Photoneuromodulation Techniques to Evaluate the Role of Green Light-Emitting Diodes in Pain Management
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Expectation generation and its effect on subsequent pain and visual perception.

Rotem Botvinik-Nezer1,2,3, Stephan Geuter1,2,3, Martin A Lindquist1,2,3

  • 1Hebrew University of Jerusalem.

Biorxiv : the Preprint Server for Biology
|October 17, 2024
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Summary
This summary is machine-generated.

Perception integrates expectations and sensory input, influencing how we experience pain and vision. Precise expectations impact perception, but effects are largely modality-specific, engaging higher cognitive processes.

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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Computational Neuroscience

Background:

  • Bayesian perception models, like predictive processing, propose that perceptions merge expectations with sensory data.
  • These models suggest perceptions align with expected values, with higher precision expectations exerting greater influence.

Purpose of the Study:

  • To investigate how cue mean and precision influence perception in both visual and pain modalities.
  • To test whether precise expectations have a stronger impact on perception and if this effect is modality-specific.

Main Methods:

  • Forty-five participants rated expectations for thermal pain and visual contrast based on cues with manipulated means, variances, and skewness.
  • Perceptual judgments were recorded after cue presentation, followed by thermal or visual stimuli.
  • fMRI was used to examine neural correlates of cue influence on perception.

Main Results:

  • Perceptions assimilated to expected values across both visual and pain modalities.
  • Cue precision primarily influenced visual ratings, not pain perception.
  • Expectations showed a bias towards extreme values, particularly low-pain cues.
  • fMRI revealed cue effects in higher-level cognitive and affective systems, not early sensory areas.

Conclusions:

  • Predictive processing theories may require integration with mechanisms like selective attention to fully explain empirical findings.
  • Expectation generation and its perceptual consequences appear largely modality-specific and engage higher-level cognitive functions over early sensory processing.