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Related Concept Videos

Vision01:24

Vision

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.
Visual System01:26

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
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...
Parallel Processing01:20

Parallel Processing

The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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.

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Related Experiment Video

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Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
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Confuse your illusion: feedback to early visual cortex contributes to perceptual completion.

Martijn E Wokke1, Annelinde R E Vandenbroucke, H Steven Scholte

  • 1University of Amsterdam, Department of Psychology,Weesperplein 4, Amsterdam, The Netherlands.martijnwokke@gmail.com

Psychological Science
|December 12, 2012
PubMed
Summary

The human brain completes visual contours of hidden objects using both early (V1/V2) and higher-level (LO) visual areas. Interestingly, higher-level areas influence earlier ones, suggesting feedback is key for this visual completion.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • The human visual system exhibits constructive properties, notably completing contours of occluded objects.
  • It remains debated whether this perceptual completion originates in early visual processing stages or requires higher-level mechanisms.

Purpose of the Study:

  • To investigate the temporal dynamics and hierarchical involvement of early (V1/V2) and higher-level (Lateral Occipital - LO) visual areas in perceptual completion.
  • To determine if feedback mechanisms contribute to the completion of illusory figures.

Main Methods:

  • Utilized transcranial magnetic stimulation (TMS) to transiently disrupt neural activity in V1/V2 and LO areas at specific time points.
  • Employed a discrimination task involving Kanizsa-type illusory figures to assess perceptual completion performance.

Main Results:

  • Both V1/V2 and the LO area are crucial for perceptual completion.
  • These areas appear to function in an inverse hierarchical manner, with V1/V2's critical time window following that of LO.
  • The findings suggest a significant role for feedback from higher-level areas to V1/V2.

Conclusions:

  • Perceptual completion of occluded objects involves a complex interplay between early and higher-level visual areas.
  • The temporal dynamics indicate a feedback mechanism from the LO area to V1/V2 is essential for contour completion.
  • These results support the growing evidence for feedback's contribution to visual perception and completion phenomena.