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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Metacognition01:26

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Metacognition is a conscious process where individuals are aware of their cognitive and executive processes, such as planning before solving a problem or self-monitoring during reading. For instance, a writer may need help with composing a piece. The situation involves a writer who is working on a piece of writing, but while doing so, they realize that something is missing. They notice that their characters lack depth or details. This realization occurs because the writer is reflecting on their...
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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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Perceptual Constancy01:12

Perceptual Constancy

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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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Hindsight Biases

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Hindsight bias leads you to believe that the event you just experienced was predictable, even though it really wasn’t. In other words, you knew all along that things would turn out the way they did. Can you relate this to the phrase "Hindsight is 20/20" now? 
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Vision01:24

Vision

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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.
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Related Experiment Video

Updated: Oct 16, 2025

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

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Metacognitive asymmetries in visual perception.

Matan Mazor1, Rani Moran1, Stephen M Fleming1

  • 1Institute of Neurology, Wellcome Centre for Human Neuroimaging, University College London, London WC1N 3BG, UK.

Neuroscience of Consciousness
|October 22, 2021
PubMed
Summary
This summary is machine-generated.

Detecting the absence of visual stimuli, even features, is psychologically demanding, leading to slower responses and lower confidence. Metacognitive sensitivity, however, appears unaffected by feature absence, suggesting low-level visual processing origins.

Keywords:
absencemetacognitionpresence

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Metacognition

Background:

  • Representing the absence of objects is psychologically demanding, often resulting in slower responses, reduced confidence, and lower metacognitive sensitivity compared to detecting presence.
  • The precise definition of stimulus absence and its cognitive underpinnings remain areas of active research.

Purpose of the Study:

  • To investigate whether processing asymmetries observed for object absence extend to absences defined by stimulus features or expectation violations.
  • To test the hypothesis that presence-absence processing differences stem from a default reasoning mode, assuming absence unless evidence suggests otherwise.

Main Methods:

  • A Registered Report methodology was employed with pre-registered hypotheses.
  • Six experiments utilized six pairs of stimuli, varying in the presence or absence of distinguishing features or expected defaults.
  • Response times, confidence ratings, and metacognitive sensitivity were measured.

Main Results:

  • The absence of local and global stimulus features led to slower and less confident responses, mirroring findings for entire stimulus absences.
  • Contrary to predictions, the presence or absence of a local feature did not significantly impact metacognitive sensitivity.
  • Metacognitive sensitivity remained stable regardless of feature presence or absence.

Conclusions:

  • The findings challenge the proposed link between metacognitive asymmetry in detection and default reasoning.
  • Results support a low-level visual origin for metacognitive asymmetries related to the presence and absence of stimuli and features.
  • Absence detection, even at the feature level, imposes a cognitive load impacting speed and confidence but not necessarily self-monitoring accuracy.