The antipointing task: vector inversion is supported by a perceptual estimate of visual space.
The authors examined whether the visual field-specific endpoint bias of mirror-symmetrical reaching movements (i.e., antipointing) is related to top-down decoupling of the normal spatial relations between target and response (i.e., visuomotor inhibition) or the inversion of target coordinates to a mirror-symmetrical location (i.e., vector inversion). Participants completed pro- and antipointing movements in left and right visual space under conditions in which movement type was performed in separate blocks (i.e., blocked condition) and when randomly interleaved on a trial-by-trial basis (i.e., random condition). Most important, the random condition entailed equivalent premovement inhibition across pro- and antipointing. Propointing produced comparable endpoint accuracy in left and right visual space whereas antipointing under- and overshot target position: a finding characterizing blocked and random conditions. The authors attribute the visual field-specific bias of antipointing to the obligatory nature of the task and the integration of visuoperceptual networks to support vector inversion.
Heath
Matthew
M
School of Kinesiology, The University of Western Ontario, London, Ontario, Canada. mhealth2@uwo.ca
Maraj
Anika
A
Maddigan
Meaghan
M
Binsted
Gordon
G
D000328:Adult; D000704:Analysis of Variance; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006225:Hand / Q000502:physiology; D006801:Humans; D007100:Imitative Behavior / Q000502:physiology; D007266:Inhibition, Psychological; D008297:Male; D009068:Movement / Q000502:physiology; D009433:Neural Inhibition / Q000502:physiology; D009949:Orientation / Q000502:physiology*; D010469:Perceptual Distortion / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D012016:Reference Values; D013028:Space Perception / Q000502:physiology*; D013997:Time Factors; D014794:Visual Fields / Q000502:physiology; D055815:Young Adult