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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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Related Experiment Video

Updated: Jul 3, 2025

VisualEyes: A Modular Software System for Oculomotor Experimentation
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Object-based attention requires monocular visual pathways.

N Strommer1,2, S Al-Janabi3, A S Greenberg3,4

  • 1Department of Psychology, University of Haifa, Mount Carmel, 31905, Haifa, Israel. Nofarstro@gmail.com.

Psychonomic Bulletin & Review
|February 13, 2024
PubMed
Summary
This summary is machine-generated.

Subcortical pathways, not just the cortex, play a key role in object-based attention (OBA). Monocular visual pathways are crucial for directing attention to objects and deploying attention within them.

Keywords:
NeurocognitionObject-based attentionSubcortical regionsVisual attention;

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Object-based attention (OBA) mechanisms are typically linked to the cerebral cortex.
  • The role of subcortical visual pathways in OBA remains largely unexplored.
  • Understanding OBA's neural basis offers insights into the evolution of attentional selection.

Purpose of the Study:

  • To investigate the involvement of lower (monocular) and higher (binocular) visual pathways in OBA.
  • To differentiate the roles of subcortical versus cortical visual processing in attentional selection.

Main Methods:

  • Utilized the classic double-rectangle cueing task.
  • Employed a stereoscope to present stimuli to specific visual pathways (monocular vs. binocular).
  • Conducted two experiments (N=33 and N=23) to assess different aspects of OBA.

Main Results:

  • Monocular visual pathways demonstrated involvement in exogenous orienting towards cued objects (Experiment 1).
  • Monocular pathways were also implicated in attentional deployment within a cued object (Experiment 2).
  • Object-based attention effects were observed only when cues and targets were presented to the same eye, highlighting monocular pathway function.

Conclusions:

  • Subcortical (monocular) visual regions possess a functional computational role in object-based attention.
  • These lower visual regions are not merely relay stations but actively contribute to attentional processes.
  • Findings underscore the significance of subcortical structures in the mechanisms underlying object-based attention.