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Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia. Related to ideational apraxia: ideomotor apraxia, constructional apraxia. [Ä«â²dÄÂ·Äâ²shÉnÉl] Etymology: Gk, idea, form, a + prassein, not to do. a condition in which the conceptual process is lost, often because of a lesion in the parietal lobe. The individual is unable to formulate a plan of movement and does not know the proper use of an object because of a lack of perception of its purpose. There is no loss of motor movement or strength, but the reason for the movement is confused. Also called sensory apraxia. See also apraxia.
It is also possible for apraxia to be caused by lesions in other areas of the brain including the non-dominant (usually right) hemisphere. Ideomotor apraxia is typically due to a decrease in blood flow to the dominant hemisphere of the brain and particularly the parietal and premotor areas. It is frequently seen in patients with corticobasal degeneration.