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Related Concept Videos

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"...
Prosopagnosia01:24

Prosopagnosia

Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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.
Language and Cognition01:27

Language and Cognition

Language serves as a bridge between ideas and communication, influencing how individuals perceive and interact with the world. Psychologists have long debated whether language shapes thought or vice versa. This discussion gained grip with Edward Sapir and Benjamin Lee Whorf in the 1940s, who proposed that language determines thought, a concept known as linguistic determinism. They suggested that the vocabulary and structure of a language influence how its speakers think and perceive reality.
Association Areas of the Cortex01:21

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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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.
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Related Experiment Video

Updated: May 8, 2026

Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology
05:38

Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology

Published on: June 29, 2021

Cognitive and neural mechanisms underlying visual and semantic processing: implications from "optic aphasia".

A E Hillis1, A Caramazza

  • 1Johns Hopkins University.

Journal of Cognitive Neuroscience
|August 22, 2013
PubMed
Summary

Patient DHY

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Linguistics

Background:

  • Optic aphasia, characterized by impaired visual naming despite intact visual recognition, has been theorized to result from disconnected semantic systems.
  • Previous hypotheses proposed separate visual and verbal, or right and left hemisphere, semantic stores.

Purpose of the Study:

  • To investigate the semantic processing of a patient with optic aphasia (DHY) to test the multiple semantic systems hypothesis.
  • To propose an alternative model for optic aphasia based on a single, modality-independent semantic system.

Main Methods:

  • Detailed analysis of patient DHY's performance on various verbal and visual naming and semantic tasks.
  • Modification of nonverbal semantic tasks to assess the depth of semantic information accessed.

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  • Comparison of DHY's performance with existing theories of semantic organization.

    • Main Results:

    • DHY exhibited typical optic aphasia patterns, performing well on tasks interpreted as accessing verbal/left hemisphere or visual/right hemisphere semantic systems.
    • DHY's accuracy decreased on modified nonverbal tasks requiring detailed semantic information, indicating incomplete visual semantic access.
    • These findings challenge the necessity of multiple semantic systems to explain optic aphasia.

    Conclusions:

    • Optic aphasia can be explained by a deficit in accessing a complete, modality-independent lexical-semantic representation from intact structural descriptions.
    • The study supports a single, modality-independent semantic system model for visual object naming.
    • The findings have implications for understanding the neuroanatomical basis of semantic and visual object processing.