[Deficit of learning of posture voluntary control in patients with cortical lesions of various locations: cortical mechanisms of posture regulation].
Forty two hemiparetic patients after cerebrovascular accidents were trained to change the position of the center of pressure according to a target on the screen with the visual feedback control. The learning was substantially impaired in comparison with the group of healthy subjects. Patients with the right-hemispheric lesions showed somewhat greater learning deficit than patients with lesions in the left hemisphere. Lesion localization also affected the process of learning. The learning was disturbed to a greater extent in patients with lesions involving not only motor but also premotor and parietal cortical areas. In patients with parieto-temporal lesions the learning reached a very low level after three initial days of training, possibly, because of the deficit of sensory integration and of body scheme in the extra-personal space. Patients with combined lesions of the motor, premotor, and parietal areas showed the lowest results. The learning was shown to depend on the deficit of proprioception and extent of postural disturbances (asymmetry of body weight distribution and amplitude of the center of pressure oscillations) rather than on the extent of motor deficit (paresis and spasticity). However, the learning itself improved some motor disturbances.
Institute of Neurology, Russian Academy of Medical Sciences, Moscow.
K I
KI
Ustinova
L A
LA
Chernikova
M E
ME
Ioffe
S S
SS
Sliva
D001676:Biofeedback, Psychology; D001696:Biomechanical Phenomena; D007839:Functional Laterality; D006801:Humans; D007858:Learning; D008875:Middle Aged; D010291:Paresis / Q000209:etiology / Q000503:physiopathology / Q000523:psychology* / Q000534:rehabilitation; D004856:Postural Balance; D011187:Posture; D020521:Stroke / Q000150:complications / Q000473:pathology / Q000503:physiopathology / Q000523:psychology*