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Reflexive limb selection and control of reach direction to moving targets in cats, monkeys, and humans.

Artikel i vetenskaplig tidskrift
Författare Sergei Perfiliev
Tadashi Isa
Bo Johnels
Göran Steg
Johan Wessberg
Publicerad i Journal of neurophysiology
Volym 104
Nummer/häfte 5
Sidor 2423-32
ISSN 1522-1598
Publiceringsår 2010
Publicerad vid Institutionen för neurovetenskap och fysiologi, sektionen för fysiologi
Institutionen för neurovetenskap och fysiologi, sektionen för klinisk neurovetenskap och rehabilitering
Sidor 2423-32
Språk en
Länkar dx.doi.org/10.1152/jn.01133.2009
Ämneskategorier Neurofysiologi

Sammanfattning

When we reach for an object, we have to decide which arm to use and the direction in which to move. According to the established view, this is voluntarily controlled and programmed in advance in time-consuming and elaborate computations. Here, we systematically tested the motor strategy used by cats, monkeys, and humans when catching an object moving at high velocity to the left or right. In all species, targets moving to the right selectively initiated movement of the right forelimb and vice versa for targets moving to the left. Movements were from the start directed toward a prospective target position. In humans, the earliest onset of electromyographic activity from start of motion of the target ranged from 90 to 110 ms in different subjects. This indicates that the selection of the arm and specification of movement direction did not result from the subject's voluntary decision, but were determined in a reflex-like manner by the parameters of the target motion. As a whole the data suggest that control of goal-directed arm movement relies largely on an innate neuronal network that, when activated by the visual signal from the target, automatically guides the arm throughout the entire movement toward the target. In the view of the present data, parametric programming of reaching in advance seems to be superfluous.

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