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What is a Sensory System?01:31

What is a Sensory System?

Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.
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Related Experiment Video

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A Method to Quantify Visual Information Processing in Children Using Eye Tracking
09:47

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Published on: July 9, 2016

Processing spatial information in the sensorimotor branch of the visual system.

B Bridgeman1, A Gemmer, T Forsman

  • 1Department of Psychology, University of California, Santa Cruz, CA 95064, USA. bruceb@cats.ucsc.edu

Vision Research
|December 15, 2000
PubMed
Summary

Visual space perception involves distinct cognitive and sensorimotor representations. The Roelofs effect reveals these differences, impacting perception but not immediate visually guided actions.

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Area of Science:

  • Psychology
  • Cognitive Science
  • Neuroscience

Background:

  • Human visual perception and action rely on distinct spatial representations.
  • The Roelofs effect, where a frame shifts perceived target location, has been used to probe these representations.

Purpose of the Study:

  • To differentiate between cognitive and sensorimotor representations of visual space.
  • To investigate the temporal dynamics and limitations of sensorimotor memory.

Main Methods:

  • Utilizing the Roelofs effect with both verbal (cognitive) and motor (sensorimotor) measures.
  • Introducing a 2-second response delay to assess motor memory limitations.
  • Employing a choice-reaction task with identical targets to isolate sensorimotor control.

Main Results:

  • The Roelofs effect influenced cognitive measures but not immediate sensorimotor actions.
  • A response delay induced the Roelofs effect in motor responses, indicating limited motor memory.
  • Motor error was independent of reaction time.
  • Choice-based motor tasks did not show the Roelofs effect, suggesting sensorimotor autonomy.

Conclusions:

  • Cognitive and sensorimotor spatial representations are dissociable.
  • Sensorimotor control exhibits rapid, independent spatial processing, even when initiated by cognitive choice.
  • Motor memory has temporal limitations that can be probed using spatial illusions like the Roelofs effect.