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Experiment 2: Mean global motion coherence thresholds for “young” and “old” participants as a function of aperture area. Dot density remained constant (1.13 dots/deg2) across conditions such that a two-fold increase in aperture area (in the range 14–227 deg2) corresponded to an equivalent increase in dot number (in the range 16–256 dots). Error bars = ±1 S.E.M.
