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" instead of "the serving spoon."
Visual agnosia can be classified into two subtypes: apperceptive visual agnosia and associative visual agnosia. Individuals with apperceptive visual agnosia often have difficulty recognizing objects, drawing, or copying figures accurately. They are unable to perceive the correct forms of objects, even though their knowledge of the objects remains intact. For example, they might see a series of lines and shapes but fail to recognize it as a drawing of a house.
On the other hand, those with associative visual agnosia can draw or copy objects but cannot identify what they have drawn. They perceive the form of the object correctly and can recognize it when given verbal or tactile information. However, they cannot link the fully perceived visual image to previous experiences to help them recognize the object. For instance, they might draw a picture of a bicycle accurately but be unable to identify it as a bicycle afterward.
Z rozdziału 3:
Now Playing
Sensation and Perception
174 Wyświetleń
Sensation and Perception
497 Wyświetleń
Sensation and Perception
431 Wyświetleń
Sensation and Perception
523 Wyświetleń
Sensation and Perception
483 Wyświetleń
Sensation and Perception
457 Wyświetleń
Sensation and Perception
312 Wyświetleń
Sensation and Perception
188 Wyświetleń
Sensation and Perception
277 Wyświetleń
Sensation and Perception
273 Wyświetleń
Sensation and Perception
233 Wyświetleń
Sensation and Perception
188 Wyświetleń
Sensation and Perception
1.5K Wyświetleń
Sensation and Perception
330 Wyświetleń
Sensation and Perception
143 Wyświetleń
See More
Copyright © 2025 MyJoVE Corporation. Wszelkie prawa zastrzeżone