Three-stage model of object perception PDF

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Tutorial Practice Essay! A simplistic essay structure that addresses the fundamental aspects of each part of the essay question.

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Using an example, describe the three stages in the three-stage model of object perception and explain how this model helps us understand two different types of agnosia

The three-stage model of object perception is divided into three significant stages which assist in identifying the particular loss of ability in an agnostic patient. Stage 1 is local features such as the edges and lines of an object, stage 2 is shape representation which is the recognition of an object’s surface and shape, and stage 3 is object representation which is the completion and entirety of the object. Patients with apperceptive agnosia are able to produce lines which means that their stage 1 (local features) is intact. However, apperceptive agnosia is the failure to recognise and copy due to deficiencies in perceptual processing which indicates the impairment of stage 2 and 3. Although their recognition of local features (stage 1) is intact, it does not provide enough information to create a shape representation (stage 2) which also impacts the individual’s ability to complete object representation as stage 3 relies on information from stage 2. Individuals with associative agnosia are able to recognise and copy objects which shows that their stage 1 (local features) is intact. The ability to extract local features (such as lines and edges) from stage 1 enables them to create a shape representation which indicates that their stage 2 is also intact. The impairment is a deficit in stage 3 (object representation) where the patient will have the inability to recognise objects, despite their intact perception of the object.

Reflection: I addressed every part of the essay question and the rubric by discussing apperceptive and associative agnosia.

Word Count: 250...