An ‘automatic pilot’ for the hand in human posterior parietal cortex: toward reinterpreting optic ataxia.
Nat Neurosci. 2000-07-01; 3(7): 729-736
DOI: 10.1038/76694
Lire sur PubMed
https://www.bordeaux-neurocampus.fr/12310
1. Nat Neurosci. 2000 Jul;3(7):729-36. doi: 10.1038/76694.
An ‘automatic pilot’ for the hand in human posterior parietal cortex: toward
reinterpreting optic ataxia.
Pisella L(1), Gréa H, Tilikete C, Vighetto A, Desmurget M, Rode G, Boisson D,
Rossetti Y.
Author information:
(1)Espace et Action, INSERM U534, 16 avenue Lépine, C.P. 13, 69676 Bron Cedex,
France.
We designed a protocol distinguishing between automatic and intentional motor
reactions to changes in target location triggered at movement onset. In response
to target jumps, but not to a similar change cued by a color switch, normal
subjects often could not avoid automatically correcting fast aiming movements.
This suggests that an ‘automatic pilot’ relying on spatial vision drives fast
corrective arm movements that can escape intentional control. In a patient with
a bilateral posterior parietal cortex (PPC) lesion, motor corrections could only
be slow and deliberate. We propose that ‘on-line’ control is the most specific
function of the PPC and that optic ataxia could result from a disruption of
automatic hand guidance.
DOI: 10.1038/76694
PMID: 10862707 [Indexed for MEDLINE]