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. Author manuscript; available in PMC: 2009 Nov 1.
Published in final edited form as: J Psychiatr Res. 2008 Apr 22;43(1):76–87. doi: 10.1016/j.jpsychires.2008.03.001

Fig. 1.

Fig. 1

Schematic illustration of task design. For each trial, the subjects’ task was to decide whether a short (11.5 mm) or a long (13 mm) mouth was presented by pressing either the ‘z’ or the ‘/’ key of a PC keyboard. The reinforcement allocation and key assignments were counterbalanced across subjects.