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1 Agnosia and prosopagnosia: Agnosia and prosopagnosia: Problems in achieving object recognition: 1. Need to solve the "image segmentation problem": Need to distinguish between objects and their surroundings, and identify which parts belong to the same object. Often difficult because luminance differences may be an unreliable guide. 2. Need to identify the object, perceptually: Need to recognise an object despite changes in its appearance due to changes in illumination, viewpoint, distance, etc. So, need to be able to generalise across views. But - may also have to distinguish between different exemplars within a category (e.g. different faces). 3. Need to identify the object, semantically: For familiar objects, need to access stored knowledge about their functions and meanings (e.g. "this is a chair", "I can sit on it", "this is a lecturer"). 4. Other aspects of object recognition: Need to know an object's location, relative to other objects and to ourselves.

Macrae Si Trolle 1956

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