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Related Concept Videos

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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Sensory Perception: Organization of the Somatosensory System01:11

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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:
The receptor level:
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Depth Perception and Spatial Vision01:15

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Perceptual Constancy01:12

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Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
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Somatosensation01:33

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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 impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Related Experiment Video

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Supervised calibration relies on the multisensory percept.

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Supervised multisensory calibration adapts to cue accuracy and reliability. When reliable cues were inaccurate, both recalibrated together, even making less reliable cues less accurate.

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Area of Science:

  • Neuroscience
  • Sensory processing
  • Computational modeling

Background:

  • Multisensory plasticity allows dynamic adaptation of sensory information.
  • Unsupervised multisensory calibration reduces cue conflict, often independent of cue reliability.
  • Environmental feedback (supervised calibration) also influences multisensory adaptation.

Purpose of the Study:

  • To investigate the combined effects of cue accuracy and reliability on supervised multisensory calibration.
  • To understand how the brain calibrates discrepant visual and vestibular motion stimuli.
  • To model the interplay between supervised and unsupervised calibration mechanisms.

Main Methods:

  • Presenting discrepant visual and vestibular motion stimuli to human participants.
  • Manipulating cue accuracy and reliability.
  • Developing a computational model to explain observed calibration behaviors.

Main Results:

  • When the less reliable cue was inaccurate, only it was calibrated.
  • When the more reliable cue was inaccurate, both cues were yoked and calibrated together.
  • The less reliable cue shifted away from external feedback, decreasing its accuracy.

Conclusions:

  • Supervised and unsupervised calibration mechanisms operate in parallel.
  • The brain prioritizes internal consistency and external accuracy in multisensory calibration.
  • This parallel processing allows for optimal adaptation to environmental sensory information.