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. 2015 Jun 4;5:10415. doi: 10.1038/srep10415

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Copyright © 2015, Macmillan Publishers Limited

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Schematic illustration of an experimental trial (Exp. 1-2). Each trial begins with a 300 ms fixation cross, after which a sequence of two-digit numbers is presented (500 ms per numeral). The sequence set-size was 4, 8 or 16 (randomly between trials). The only instructions participants received were to convey as accurately as possible the sequence’s average, by vertically sliding a mouse-controlled bar set on a number ruler between 0 and 100 (the number corresponding to the bar’s location was concurrently displayed).