A condition in which a person's conceptual process is missing, often because of a lesion in the parietal lobe of the brain which is that part of the cerebral hemisphere that lies beneath the parietal bone or the main side bone of the skull: Susan has ideational apraxia, or sensory apraxia, and is incapable of formulating certain plans for the movements of things because she doesn't know what the proper uses of the objects are.

Working in the kitchen can be dangerous when someone, like Jane, suffers from ideational apraxia and is not sure how to use kitchen equipment correctly.

Being unable to perform a movement involving the use of a tool, an instrument, or another object: "The man's sensory apraxia handicapped him because he couldn't determine the size, shape, and purpose of what the doctor meant when he was told to pick up a hammer, the pliers, etc."