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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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Prosopagnosia01:24

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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...
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Auditory Perception01:17

Auditory Perception

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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Higher Mental Functions of the Brain: Language01:10

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Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
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Olfactory Receptors: Location and Structure01:03

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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Hearing01:31

Hearing

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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Related Experiment Video

Updated: Jan 6, 2026

A Semantic Priming Event-related Potential ERP Task to Study Lexico-semantic and Visuo-semantic Processing in Autism Spectrum Disorder
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Avian agnosia: A window into auditory semantics.

J A Mole1, I W Baker2, J M Ottley Munoz2

  • 1Russell Cairns Unit, John Radcliffe Hospital, Oxford, UK; Department of Neuropsychology, National Hospital for Neurology and Neurosurgery, London, UK.

Neuropsychologia
|October 9, 2019
PubMed
Summary
This summary is machine-generated.

Expertise impacts auditory and visual knowledge organization similarly, though auditory knowledge may be more susceptible to decline in semantic dementia patients. This study explored bird knowledge in a semantic dementia patient.

Keywords:
Auditory agnosiaBirdExpertiseSemantic dementia

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Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology

Background:

  • The organization of auditory knowledge and the influence of expertise remain poorly understood.
  • Semantic dementia reveals expertise impacts knowledge differentiation, but its effect on auditory knowledge is unclear.

Observation:

  • A patient with semantic dementia (SA) and extensive prior bird knowledge was studied.
  • SA exhibited impaired auditory bird knowledge but intact visual bird knowledge, despite normal basic auditory perception.

Findings:

  • Both modality (auditory vs. visual) and expertise level independently affected SA's knowledge recall.
  • SA showed greater impairment in auditory knowledge and non-expert categories across both modalities.

Implications:

  • Auditory knowledge may be more vulnerable to degradation than visual knowledge.
  • Expertise influences auditory and visual knowledge organization to a comparable degree.
  • Findings advance understanding of knowledge representation in semantic dementia.