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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...
Perception01:28

Perception

Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
Bottom-up processing begins at the sensory level, where receptors detect external environmental stimuli. These could include the tactile sensation of...
Dementia l: Introduction01:22

Dementia l: Introduction

Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
Encoding01:19

Encoding

Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
Automatic processing involves the encoding of details like time, space, frequency, and the meaning of words, usually done without conscious...
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.

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[Category-specific deficits in semantic dementia: links between perception and semantic knowledge].

Guillaume Vallet1, Martine Simard, Claudette Fortin

  • 1École de psychologie, Université Laval, Québec, Canada. guillaume.vallet.1@ulaval.ca

Geriatrie Et Psychologie Neuropsychiatrie Du Vieillissement
|September 8, 2011
PubMed
Summary

Knowledge and perception are closely linked, especially in semantic dementia (SD). Research suggests sensory-dependent memory theories align with findings of impaired visual integration in SD patients, supporting the sensory-functional theory (SFT).

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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Linguistics

Context:

  • Investigates the fundamental relationship between abstract knowledge representation and sensory-dependent perception.
  • Examines category-specific impairments and the sensory-functional theory (SFT) as models for understanding semantic memory.
  • Focuses on semantic dementia (SD), a condition characterized by progressive semantic knowledge loss.

Purpose:

  • To explore the intricate connections between knowledge and perception within the context of semantic dementia.
  • To evaluate the explanatory power of the sensory-functional theory (SFT) in accounting for category-specific deficits.
  • To analyze perceptual processing in SD patients, from basic sensory input to multimodal integration.

Summary:

  • Semantic dementia patients exhibit normal basic perception but impaired visual integration of existing knowledge, particularly for living items.
  • Findings suggest that while sensory knowledge processing may be intact, higher-level perceptual integration is compromised in SD.
  • The study links these deficits to the anterior temporal lobes, vulnerable in SD and implicated in multimodal integration.

Impact:

  • Provides evidence supporting sensory-dependent memory approaches over abstract knowledge models.
  • Suggests that the sensory-functional theory (SFT) offers a viable framework for understanding semantic memory impairments.
  • Highlights the role of multimodal integration and anterior temporal lobe function in semantic cognition.