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Fig. 1 Reference-fixing experiment, setup.
Reference-fixing experiment, setup. Superimposed on the left image, we see two lines, one in red and one in green. The arrow line (red) extends along the angle of the finger; the touch line (green) extends from the participant’s eye through the fingertip. Our prediction was that the green line would be a better predictor of what someone is pointing at than the red line. The image on the left illustrates the apparatus and setup for 3-year-olds to adults, the image on the right illustrates the setup for the 18-month-olds. Cathal O’Madagain et al. Sci Adv 2019;5:eaav2558 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
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