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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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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

Updated: Apr 24, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

Published on: August 22, 2025

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Motion direction biases and decoding in human visual cortex.

Helena X Wang1, Elisha P Merriam1, Jeremy Freeman2

  • 1Center for Neural Science and Department of Psychology, New York University, New York, New York 10003, and.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 12, 2014
PubMed
Summary
This summary is machine-generated.

Functional magnetic resonance imaging (fMRI) studies reveal that visual motion decoding accuracy is linked to stimulus aperture shape, not motion direction. This finding challenges previous interpretations of visual cortex functional architecture.

Keywords:
coarse-scale biasdirection preferencefMRImotion decodingmultivariate classificationvisual cortex

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Functional magnetic resonance imaging (fMRI) is used to decode visual motion direction from cortical activity.
  • Above-chance decoding infers neural population properties, and response biases are interpreted as functional architecture maps.

Purpose of the Study:

  • To investigate the relationship between fMRI-based motion decoding and the functional organization of visual cortex.
  • To identify the factors influencing motion-decoding accuracy in human visual cortex.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) in human participants.
  • Applied multivariate analysis methods to decode visual motion direction.
  • Analyzed direction-selective response biases across voxels in visual cortex.

Main Results:

  • A direction-selective response bias was identified, predicting motion-decoding accuracy.
  • This bias depended on stimulus aperture shape, not absolute motion direction.
  • The bias was present in V1, V2, V3, but not MT+, explaining higher early visual cortex decoding accuracies.

Conclusions:

  • fMRI-based motion decoding shows little to no dependence on the functional organization of motion selectivity.
  • Stimulus aperture shape is a critical factor in motion decoding, influencing response amplitudes.
  • Previous interpretations of functional architecture maps based on decoding may need re-evaluation.