Psychology 2135A/B Lecture Notes - Prosopagnosia, Agnosia, Neuropsychology

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Impaired Object Recognition
- science of mental and behavioural impairments resulting from brain damage
- focuses on which processes are compromised and spared
Visual Agnosia
- vision without knowledge
- normal process: sensation -> stimulus representation -> semantic information (meaning,
- can discover what things are through other senses
- 1. Apperceptive
- unable to form stable [pre-semantic; before identifying] representations of objects
- cannot generate stimulus representation; can get colour and orientation, but cannot integrate
into single percept
- 2. Associative
- can form percept of object but cannot identify
- communication from stimulus representation to semantic information is damaged
- cannot match objects by function
-cannot draw from memory
- 3. Category-specific
- Associative agnosia for some categories of objects but not others i.e. prosopagnosia
- controversial
- areas in brain for specific functions (i.e. face) may not be true; suggests areas have neurons for
many categories
The controversy over face recognition
- can still recognize with voice, hair, and clothing
- many people who have this usually do not tell others
- can have internal image of face, but no communication with the knowledge of the face
- some prosopagnosia people cannot identify some things