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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...
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.
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...
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...
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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...

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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

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Published on: April 16, 2014

Visual imagery facilitates visual perception: psychophysical evidence.

A Ishai1, D Sagi

  • 1National Institutes of Health.

Journal of Cognitive Neuroscience
|August 24, 2013
PubMed
Summary
This summary is machine-generated.

Visual imagery can directly facilitate visual perception, contrary to previous findings. This study shows that imagined stimuli, like perceived ones, can lower detection thresholds, especially at close distances.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Psychophysics

Background:

  • The neural overlap between visual imagery and perception remains debated.
  • Prior research suggested visual imagery interferes with perception (Perky effect).

Purpose of the Study:

  • To investigate the facilitatory effect of visual imagery on visual perception.
  • To determine if imagined stimuli can influence perceptual thresholds.

Main Methods:

  • Utilized a lateral masking detection paradigm with Gabor targets and masks.
  • Employed psychophysical methods to measure contrast detection thresholds.
  • Compared effects of perceived versus imagined flanking masks at varying distances.

Main Results:

  • Both perceived and imagined masks reduced contrast detection thresholds.
  • Imagery induced a 50% threshold reduction at short distances, comparable to perception at long distances.
  • Facilitation was specific to stimulus orientation and the eye used.

Conclusions:

  • Data suggest a stimulus-specific short-term memory system supporting imagery.
  • Top-down processes reactivate quasi-pictorial representations.
  • Stimulus parameters influence facilitation at short distances; top-down factors contribute at longer distances.