Apperceptive agnosia

Apperceptive agnosia

Apperceptive Agnosia is the visual disorder that renders a person unable to recognise objects. It is also known as "visual space agnosia". Distinction between shapes is difficult, although other aspects of vision, such as ability to see detail and colour, remain intact. Recognition of, copying and discriminating between visual stimuli, even of different shapes, is problematic. Apperceptive agnosics cannot complete an object matching task.

Identification of objects, therefore, is entirely based on inferences made by the person based on the colour or size (or other cue) of the object.

A variant of apperceptive agnosia is the inability to recognise objects outside of their normal roation or orientation.

References

* http://www.psych.ucalgary.ca/PACE/VA-Lab/Visual%20Agnosias/types%20of%20agnosias.html

Further reading

* "Fundamentals of Sensation and Perception", Michael Levine. Oxford University Press (3rd Edition). London, 2000.
* "Visual Perception", Tom Cornsweet. Harcourt Publishing, London, 1970.


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