Compare and contrast agnosias and ataxias

What will be an ideal response?


People who suffer from an agnosia have trouble perceiving sensory information. Agnosias often are caused by damage to the border of the temporal and occipital lobes or restricted oxygen flow to areas of the brain, sometimes as a result of traumatic brain injury. There are many kinds of agnosias. Not all of them are visual. Generally, people with agnosia have normal sensations of what is in front of them. They can perceive the colors and shapes of objects and persons, but they cannot recognize what the objects are. They have trouble with the "what pathway".

A different kind of perceptual deficit is associated with damage to the "how pathway". This deficit is optic ataxia, which is an impaired ability to use the visual system to guide movement. People with this deficit have trouble reaching for things. All of us have had the experience of coming home at night and trying to find the keyhole in the front door. It's too dark to see, and we have to grope with our key for the keyhole, often taking a while to find it. Someone with optic ataxia has this problem even with a fully lit visual field.

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