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. Author manuscript; available in PMC: 2014 Jan 1.
Published in final edited form as: Psychopharmacology (Berl). 2012 Aug 24;225(2):397–406. doi: 10.1007/s00213-012-2825-7

Figure 1.

Figure 1

Illustration of OST and simple discrimination (SD) procedures. Left column shows stimulus configurations for the OST over several trials with a single rewarded odor on Trial 1 (A+) and a new odor introduced on Trial 2 (second row, B+). Rows 3-5 show that the number of comparisons in the arena increments until five is reached, and Row 6 illustrates how four previously encountered stimuli are selected along with one new odor on Trials 6-24 (row 6). Right column shows stimulus configurations for the SD task and illustrates that responses to one stimulus (S1) are always reinforced, and that responses to the other stimuli (S2, S3, S4, S5) are never reinforced.