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Vision01:24

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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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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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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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Related Experiment Video

Updated: Jun 16, 2025

VisualEyes: A Modular Software System for Oculomotor Experimentation
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VisualEyes: A Modular Software System for Oculomotor Experimentation

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Internal coupling: Eye behavior coupled to visual imagery.

Živa Korda1, Sonja Walcher1, Christof Körner1

  • 1Department of Psychology, University of Graz, Graz, Austria.

Neuroscience and Biobehavioral Reviews
|August 17, 2024
PubMed
Summary
This summary is machine-generated.

Eye movements reflect internal cognitive processes like visual imagery, a phenomenon known as internal coupling. This coupling not only mirrors mental imagery but also supports cognitive functions.

Keywords:
Eye movementsInternal attentionInternal couplingInternally directed cognitionOculomotor behavior

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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Ophthalmology

Background:

  • The human visual system engages with both external stimuli and internal cognitive processes.
  • Internal cognition includes visual imagery, where the mind generates visual representations without direct sensory input.
  • Internal coupling describes the link between eye movements and these internal cognitive states.

Purpose of the Study:

  • To synthesize current evidence on internal coupling across various cognitive domains.
  • To examine the relationship between eye movements and mental imagery.
  • To explore the functional and neurobiological underpinnings of internal coupling.

Main Methods:

  • Systematic review of empirical studies investigating eye movements during mental imagery tasks.
  • Analysis of data across diverse cognitive domains: memory, numerical cognition, movement simulation, and imagery.
  • Integration of theoretical accounts and neurobiological findings related to internal coupling.

Main Results:

  • Eye movements consistently mirror distinct aspects of mental imagery, similar to visual perception.
  • Evidence suggests internal coupling supports cognitive performance, indicating a functional role.
  • Shared neural pathways exist for both externally and internally directed cognition.

Conclusions:

  • Internal coupling is a significant phenomenon linking eye movements to internal cognition and visual imagery.
  • Potential roles include memory reconstruction and attentional shifts.
  • Future research should investigate contextual and individual difference moderators.