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  • Title: Ideomotor and ideational apraxia in corticobasal degeneration: a case study.
    Author: Chainay H, Humphreys GW.
    Journal: Neurocase; 2003 Apr; 9(2):177-86. PubMed ID: 12925941.
    Abstract:
    Corticobasal degeneration (CBD) is a progressive disorder that can be characterised by asymmetrical akinetic rigidity, involuntary movements, cortical sensory loss, alien limb syndrome and asymmetrical apraxia (Gibb et al., 1989; Rinnie et al., 1994). Diagnosis of praxic disabilities is thought to be essential for distinguishing CBD, in its early stage, from other akinetic-rigid syndromes. However, the nature of apraxia in CBD, and the relations between ideomotor and ideational apraxia, are not well understood. For example, if there is an ideational deficit in a given patient, does this deficit occur independently of any ideomotor disorder, or are the two impairments linked in some manner? In the present paper we report a case study of a patient with apraxia due to CBD. We examine whether the disorder is confined to production tasks, or whether there is also a related deficit in recognising the correct actions performed with objects (an ideational deficit). We also evaluate whether a disorder found for action with single objects dissociates from the ability to link multiple actions into more complex, everyday tasks. The performance of our patient showed an impairment in both action production and action recognition system, suggesting a component of ideational as well as ideomotor apraxia in CBD.
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