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Plasticity in the Structure of Visual Space.

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Altering neural connections in the visual cortex changes how we perceive space. Strengthening lateral connections shrinks perceived distances, reshaping visual space topography.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • The topographical structure of human visual space is not fully understood.
  • Intrinsic lateral connections in the visual cortex are hypothesized to shape visual space.

Purpose of the Study:

  • To test a framework proposing that lateral connection strength dictates visual space structure.
  • To investigate if modifying lateral connections alters perceived spatial relationships and distances.

Main Methods:

  • Employed human psychophysics experiments with a Hebbian training protocol.
  • Synchronous flashing of two-point stimuli strengthened lateral connections between visual cortex neurons.
  • Measured perceived distance changes after the training intervention.

Main Results:

  • Participants reported a significant contraction in perceived distance after training.
  • Perceptual contraction extended to untrained locations indirectly linked by strengthened connections.
  • Training effects diminished when stimulus locations were too close or too far apart.

Conclusions:

  • Local changes in lateral connection strength can modify the topographical organization of visual space.
  • This provides evidence for intrinsic neural connectivity shaping spatial perception.
  • The findings support a model where neural network dynamics underlie visual spatial experience.