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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: Sep 29, 2025

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
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Visual Motion Coherence Responses in Human Visual Cortex.

Andriani Rina1,2, Amalia Papanikolaou3, Xiaopeng Zong4

  • 1Department of Neurology Brigham and Women's Hospital and Jamaica Plain Veterans Administration Hospital, Harvard Medical School, Boston, MA, United States.

Frontiers in Neuroscience
|March 21, 2022
PubMed
Summary
This summary is machine-generated.

Investigating motion perception, this study found that the human visual area hV5/MT+ responds differently to random dot kinematograms (RDKs) during fixation versus active motion discrimination tasks, even in subjects with cortical scotomas.

Keywords:
RDKfMRIhV5/MT+motion coherencevisual cortex

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Functional Magnetic Resonance Imaging (fMRI)

Background:

  • Random dot kinematograms (RDKs) are used to train individuals with cortical scotomas to improve motion perception.
  • Understanding visual cortex responses to RDKs in both healthy subjects and those with scotomas is crucial for studying visual recovery.
  • Previous studies on blood oxygen level-dependent (BOLD) responses in area hV5/MT+ used fixation or less specific baselines, potentially limiting insights into motion coherence processing.

Purpose of the Study:

  • To investigate how the human visual area hV5/MT+ responds to RDK stimuli under different task conditions (fixation vs. motion discrimination).
  • To isolate the BOLD response specifically related to the spatial integration of local motion signals (motion coherence).
  • To compare RDK responses in healthy subjects and subjects with cortical scotomas during a motion discrimination task.

Main Methods:

  • Utilized random dot kinematograms (RDKs) with varying degrees of motion coherence.
  • Measured blood oxygen level-dependent (BOLD) responses in the human area hV5/MT+ using functional magnetic resonance imaging (fMRI).
  • Compared responses during passive fixation, active motion discrimination tasks, and RDK presentation within scotomas.

Main Results:

  • In healthy subjects, area hV5/MT+ showed monotonically increasing BOLD responses with motion coherence during fixation.
  • During an active motion discrimination task, area hV5/MT+ responses remained flat across varying motion coherence levels in healthy subjects.
  • Subjects with cortical scotomas exhibited similar flat hV5/MT+ responses during motion discrimination within the scotoma, with no significant response during passive RDK presentation.

Conclusions:

  • The task demands significantly alter BOLD responses in area hV5/MT+ to RDKs, with active discrimination suppressing coherence-dependent activity.
  • Area hV5/MT+ responses in subjects with cortical scotomas during active discrimination mirror those in healthy subjects, suggesting preserved, albeit potentially altered, processing mechanisms.
  • These findings provide a refined understanding of motion coherence processing in the visual cortex and inform future research on visual recovery after injury.