BACKGROUND An extensive literature describes structural lesions in apraxia, but few studies have used functional neuroimaging. We used positron emission tomography (PET) to characterize relative cerebral glucose metabolism in a 65-year-old, right-handed woman with progressive decline in ability to manipulate objects, write, and articulate speech. OBJECTIVE To characterize functional brain org...

Introduction Apraxia is defined as a disorder of learned skilled movements, in the absence of elementary motor or sensory deficits and general cognitive impairment, such as inattention to commands, object-recognition deficits or poor oral comprehension. Limb apraxia has long been a challenge for clinical assessment and understanding and covers a wide spectrum of disorders, all involving motor c...

The feeling of acting voluntarily is a fundamental component of human behavior and social life and is usually accompanied by a sense of agency. However, this ability can be impaired in a number of diseases and disorders. An important example is apraxia, a disturbance traditionally defined as a disorder of voluntary skillful movements that often results from frontal-parietal brain damage. The fi...

Ideomotor apraxia is a symptom of left hemisphere damage. Patients with ideomotor apraxia commit errors when imitating movements with their left, non-paralyzed hand. This has been taken as evidence for a motor dominance of the left hemisphere. It has been hypothesized that the left hemisphere is dominant for internal preprogramming of skilled movements of either hand. We investigated the kinema...

A conductor suddenly developed global aphasia and severe ideomotor apraxia as a result of an infarct in the territory of the left middle cerebral artery. Although aphasia and apraxia remained unchanged during the following six years, his musical capacities were largely spared and he was still able to conduct. This case provides some evidence in favour of right hemisphere dominance for music.

Ataxia-telangiectasia-like disorder 1 (ATLD1) is a rare neurodegenerative associated with early onset ataxia and oculomotor apraxia. The genetic determination of ATLD1 mutation in the MRE11 gene (meiotic recombination 11 gene), which causes DNA-double strand break repair deficits. Clinical features patients resemble those telangiectasia (AT), slower progression milder presentation. Main symptom...

Response to Letter Regarding Article, “Damage to the Left Precentral Gyrus Is Associated With Apraxia of Speech in Acute Stroke” We appreciate the letter by Terao et al on our recent publication. The posterior wall of the precentral gyrus corresponds to the primary motor cortex or Brodmann’s area 4 at its mid to dorsal parts and to the premotor cortex or Brodmann’s area 6 at its ventral part. T...