Position coding in a video-controlled pointing task with a rotated visual display: evidence for individual differences in visuo-proprioceptive interaction.
In video-controlled tasks, visuomotor performance is generally initially poor with rotated visual display, but improves through trial-by-trial learning. We hypothesise that the inaccurate processing of the visual hand-to-target vector mainly results from the persistent influence of non-visual information relating to arm posture. To test this hypothesis, arm-related proprioceptive and visual information were independently manipulated in a video-controlled pointing task. Analysis of movement vectors revealed that the target was located according to the visual hand but its proprioceptive orientation (Allelocentric(1) system of reference, N = 10), or according to the proprioceptive hand location and orientation (Egocentric system of reference, N = 8). The prevalence of one system of reference correlated with the accuracy of proprioceptive signals informing about arm posture. One obstacle in mastering video-controlled task results thus from the persistent influence of proprioceptive information in the spatial coding of visual goals for action, which however differs across individuals.
Coello
Y
Y
URECA (EA 1059), Université Charles de Gaulle, Lille III, BP 149, 59653 Villeneuve d'Ascq Cedex, France. coello@univ-lille3.fr
Milleville-Pennel
I
I
Orliaguet
J P
JP
D000293:Adolescent; D000328:Adult; D005260:Female; D005568:Forms and Records Control / Q000379:methods; D006225:Hand / Q000502:physiology; D006801:Humans; D007206:Individuality; D008297:Male; D009068:Movement / Q000502:physiology; D009949:Orientation / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D011434:Proprioception / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D014796:Visual Perception / Q000502:physiology*