Fig. 2 Reference-fixing experiment, results. Reference-fixing experiment, results. The location of the dots on the vertical axis shows the distance of either the touch line or arrow line in degrees from the target (target at 0°). Dots depict individual means, lines connect the arrow, and touch measures of individuals. Box around 18-month-olds indicates that a modified procedure was used. 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).