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Related Concept Videos

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.
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 Agnosia01:12

Visual Agnosia

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 end"...
Neural Circuits01:25

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
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...

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Related Experiment Video

Updated: Jun 9, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
07:08

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Published on: August 1, 2018

Dynamic norm-based encoding for unfamiliar shapes in human visual cortex.

Sven Panis1, Johan Wagemans, Hans P Op de Beeck

  • 1University of Leuven (K.U. Leuven), Belgium.

Journal of Cognitive Neuroscience
|September 3, 2010
PubMed
Summary

Visual experience shapes how the brain represents novel objects, establishing a perceived norm. Objects closer to this norm elicit weaker neural responses in visual cortex, demonstrating dynamic norm-based encoding.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Previous research suggests object representation relies on deviation from a class prototype, with prototypes evoking smaller neural responses.
  • Uncertainty remains regarding the emergence of norm-based representations for novel object classes and the influence of stimulus properties versus adaptation.

Purpose of the Study:

  • To investigate if visual experience can establish a norm for novel object classes within experimental timescales.
  • To determine if prototypicality, physical properties, or adaptation drives neural responses in object representation.

Main Methods:

  • Combined behavioral experiments and event-related functional magnetic resonance imaging (fMRI) in humans.
  • Utilized novel object classes to assess the development of norm-based representations.
  • Controlled for stimulus physical characteristics and trial-to-trial adaptation.

Main Results:

  • Behavioral asymmetries in stimulus comparison tasks indicated the emergence of prototypicality effects.
  • fMRI data showed reduced neural responses in the anterior visual object-selective cortex for exemplars closest to the perceived class prototype.
  • Distinguished between physical stimulus properties and prototypicality, and accounted for adaptation effects.

Conclusions:

  • A brief period of visual experience with novel object classes dynamically establishes a perceived norm.
  • The anterior visual object-selective cortex employs a dynamic, norm-based encoding principle to represent object identity.
  • Prototypicality, not just physical properties or adaptation, significantly influences neural representations in high-level visual areas.