The prefrontal cortex and conscious monitoring of action - An experimental study

Slachevsky, A; Pillon, B; Fourneret, P; Renie, L; Levy R.; Jeannerod, M; Dubois, B

Abstract

To investigate the role of the prefrontal cortex in conscious monitoring, we used an experimental paradigm generating a conflict between the action planned and the sensory-motor feedback. We analyzed the acquisition of explicit knowledge of the strategy for resolving the conflict and its influence on motor adaptation. Twenty patients with frontal lobe lesions and 18 controls had to trace a sagittal line with a stylus on a graphics tablet. A mirror on which the traced line, processed by a computer, was projected hid the hand. A mask limited visual feedback to the last third of the trajectory. Without informing the subjects, the line traced was modified by introducing a bias of 24° to the right. To succeed in the task, subjects had to modify their motor program and to deviate their trajectory in the opposite direction. Conscious elaboration of the strategy was evaluated by the number of trials needed to explicitly report the required deviation. Three groups of patients were distinguished: (1) with normal explicit strategy; (2) with delayed explicit strategy, and (3) without explicit strategy at the last trial. They significantly differed by the severity of the dysexecutive syndrome, particularly of environmental adherence. Motor adaptation was evaluated by the area between the line traced and the ideal line to compensate for the deviation. In patients with normal elaboration of the strategy, motor control was similar to that of controls, but it was severely disturbed in the other two groups. These results suggest the involvement of the prefrontal cortex in conscious motor monitoring. © 2002 Elsevier Science Ltd. All rights reserved.

Más información

Título según WOS: The prefrontal cortex and conscious monitoring of action - An experimental study
Título según SCOPUS: The prefrontal cortex and conscious monitoring of action: An experimental study
Título de la Revista: NEUROPSYCHOLOGIA
Volumen: 41
Número: 6
Editorial: PERGAMON-ELSEVIER SCIENCE LTD
Fecha de publicación: 2003
Página de inicio: 655
Página final: 665
Idioma: English
URL: http://linkinghub.elsevier.com/retrieve/pii/S0028393202002257
DOI:

10.1016/S0028-3932(02)00225-7

Notas: ISI, SCOPUS