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Related Concept Videos

Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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 5, 2026

Assessment of Static Graviceptive Perception in the Roll-Plane using the Subjective Visual Vertical Paradigm
06:30

Assessment of Static Graviceptive Perception in the Roll-Plane using the Subjective Visual Vertical Paradigm

Published on: April 28, 2020

The subjective visual vertical in a nonhuman primate.

Nabil Daddaoua1, Peter W Dicke, Peter Thier

  • 1Center for Neurology, Hertie Institute for Clinical Brain Research, Department of Cognitive Neurology, University of Tuebingen, Tuebingen, Germany. nabil.daddaoua@klinikum.uni-tuebingen.de

Journal of Vision
|May 20, 2008
PubMed
Summary
This summary is machine-generated.

Monkeys, like humans, experience visual distortions when their bodies are tilted. This study found similar E-effect-like overestimations of body tilt in monkeys, aiding the search for neural mechanisms of upright visual perception.

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Last Updated: Jul 5, 2026

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Area of Science:

  • Neuroscience
  • Perception Science
  • Visuo-Vestibular Interaction

Background:

  • The human visual system uses body orientation to maintain an upright perception of the visual world.
  • This process is imperfect, leading to subjective visual vertical distortions like the E-effect (overestimation of tilt) and A-effect (underestimation of tilt).
  • Understanding these distortions may help identify neural bases for tilt-independent visual object representation.

Purpose of the Study:

  • To investigate whether monkeys exhibit similar perceptual distortions in visual verticality as humans.
  • To explore the potential of using monkey models to uncover the neural mechanisms underlying upright visual perception.

Main Methods:

  • Two monkeys were trained to align a visual arrow with a reference line under varying roll-tilt conditions (-90 to 90 degrees).
  • Reference line visibility was manipulated across trials.
  • Monkey responses were analyzed for deviations from accurate alignment, particularly in trials without a visible reference line.

Main Results:

  • Monkeys accurately aligned the arrow when the reference line was visible.
  • In trials lacking a reference line, monkeys demonstrated an overestimation of body tilt, analogous to the human E-effect.
  • These findings indicate a conserved visuo-vestibular illusion across species.

Conclusions:

  • Monkeys exhibit comparable visuo-vestibular illusions to humans, specifically an E-effect-like distortion.
  • This cross-species similarity is crucial for investigating the neural underpinnings of upright visual perception.
  • The study provides a foundation for identifying single neurons involved in maintaining a stable internal representation of visual space.