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. Author manuscript; available in PMC: 2012 May 21.
Published in final edited form as: Science. 2005 Apr 8;308(5719):255–258. doi: 10.1126/science.1107621

Fig. 1.

Fig. 1

Events shown during (A) the first familiarization and (B) the second and third familiarization trials. The light gray box represents the yellow box; the dark gray box represents the green box.