Functional Significance of Complexity Measures in the Sensory-motor Behavior

Prior to the tapping test, regional anesthesia is performed in the form of sensory blocks distal to the wrist: injection of ropivacaine 7.5mg / ml is carried out successively in contact with three nerves (ulnar, median and radial) with a volume of 2 ml for nerve, for a total of 45mg.

Patients will don a mask that prevents them from seeing during the tapping test.

Patients will don a helmet that prevents them from hearing during the tapping test.

"Subjects will be placed at a table in a sitting position where they will perform a rhythmic finger tapping test. The seat height is adjusted so that the front dominant arm rests comfortably on the table. Subjects will be equipped with headphones to receive auditory signals during a first synchronized phase of tapping.~After the last auditory signal, participants will continue the tapping task by themselves as directed: after the metronome stops,continue tapping the prescribed tempo as accurately and consistently as possible throughout the test. The movements of the index finger will be measured by a single-axis accelerometer (15 × 15 mm) attached to the nail."