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Related Concept Videos

Perception01:28

Perception

Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
Bottom-up processing begins at the sensory level, where receptors detect external environmental stimuli. These could include the tactile sensation of...
Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
Gestalt Principles of Perception01:21

Gestalt Principles of Perception

Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
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.
Subliminal Perception01:15

Subliminal Perception

Subliminal perception refers to the processing of sensory information that occurs below the level of conscious awareness. Researchers study subliminal perception by presenting a stimulus, such as a word or image, very quickly, typically around 50 milliseconds. This rapid presentation is often followed by another stimulus, such as a pattern of dots or lines, which blocks further mental processing of the initial stimulus. As a result, if participants cannot identify the initial stimulus better...

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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
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Perisaccadic mislocalization as optimal percept.

Tobias Teichert1, Steffen Klingenhoefer, Thomas Wachtler

  • 1Columbia University, Department of Neuroscience, New York, NY, USA. tt2288@columbia.edu

Journal of Vision
|October 2, 2010
PubMed
Summary
This summary is machine-generated.

Perisaccadic shift, or mislocalization during eye movements, is explained by a new model. This model reconciles the reafference principle with visual perception during saccades.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Visual Perception

Background:

  • Perisaccadic shift is the mislocalization of stimuli during eye movements.
  • Previous models struggle to explain why continuously presented stimuli are correctly localized during saccades.

Purpose of the Study:

  • To propose a novel model that explains both perisaccadic shift and correct localization of continuously presented stimuli.
  • To re-interpret the role of extraretinal signals in visual perception during eye movements.

Main Methods:

  • Developed a computational model based on the reafference principle.
  • Assumed extraretinal signals accurately predict retinal stimulus position.
  • Incorporated temporal low-pass filtering in the afferent visual pathway.

Main Results:

  • The model successfully reconciles previously conflicting observations about perisaccadic perception.
  • Demonstrated how stable perisaccadic position estimates can lead to perisaccadic shift.
  • Showed that extraretinal signals are optimal predictors, not erroneous eye-position estimates.

Conclusions:

  • The proposed model offers a unified explanation for perisaccadic phenomena.
  • Highlights the importance of reafference and predictive coding in visual stability.
  • Suggests a revised understanding of extraretinal signal function in eye movement perception.