title: Pivots for pointing: visually-monitored pointing has higher arm elevations than pointing blindfolded.
abstract: Observers pointing to a target viewed directly may elevate their fingertip close to the line of sight. However, pointing blindfolded, after viewing the target, they may pivot lower, from the shoulder, aligning the arm with the target as if reaching to the target. Indeed, in Experiment 1 participants elevated their arms more in visually monitored than blindfolded pointing. In Experiment 2, pointing to a visible target they elevated a short pointer more than a long one, raising its tip to the line of sight. In Experiment 3, the Experimenter aligned the participant's arm with the target. Participants judged they were pointing below a visually monitored target. In Experiment 4, participants viewing another person pointing, eyes-open or eyes-closed, judged the target was aligned with the pointing arm. In Experiment 5, participants viewed their arm and the target via a mirror and posed their arm so that it was aligned with the target. Arm elevation was higher in pointing directly.
authors.affiliation: Department of Psychology, University of Toronto-Scarborough, Toronto, Ontario, Canada.
authors.forename: Marta
authors.initials: M
authors.lastname: Wnuczko
authors.forename: John M
authors.initials: JM
authors.lastname: Kennedy
mesh_terms: D001827:Body Height; D004215:Distance Perception; D005260:Female; D006801:Humans; D007600:Judgment; D007699:Kinesthesis; D008297:Male; D009949:Orientation; D010364:Pattern Recognition, Visual; D011434:Proprioception; D011597:Psychomotor Performance; D011601:Psychophysics; D012683:Sensory Deprivation; D013028:Space Perception; D055815:Young Adult