Deficits in perception

Cognitive Psychology lesson

1. DEFICITS IN PERCEPTION Prepared by: Magadia , Kimberly B.

2. Learning Objectives: To understand agnosias and ataxias 1 To discuss color blindness briefly 2 3 4 To explain evidence for separate systems To determine the importance of perception practically

3. AGNOSIA - the inability to process sensory information

4. Types of Visual Agnosia Visual-object Agnosia - can sense all parts of the visual field but the objects they see does not mean to them Simultagnosia - unable to pay attention to more than one object at a time Prosopagnosia - severe impairment in their ability to recognize human faces including their own

5. OPTIC ATAXIA - the inability to use visual system to guide movements

6. AHA! Extreme specificity of deficits leads researchers about modular processes. 1 particular task = 1 separate system

7. Evidence for Separate Systems Prosopagnosia - Inability to recognize faces but can recognize objects Associative Agnosia - Difficulty with recognizing objects but can recognize faces

8. Color Blindness - it is another type of perceptual deficit and often happens when someone cannot distinguish between certain colors 2 types Monochromacy - no color vision at all Dichromacy – difficulty in determining colors between greens and reds, and occasionally blue

9. Importance of Understanding Perception It improves individual’s chances for survival and safety. It helps in designing devices to restore perception to those who have lost some (or all) and also to provide treatments for other perceptual problems.

10. Thank you