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. Author manuscript; available in PMC: 2018 Sep 1.
Published in final edited form as: Neurobiol Learn Mem. 2016 Nov 15;143:8–17. doi: 10.1016/j.nlm.2016.11.010

Figure 1.

Figure 1

A) Illustration of the two types of training trials used in our standard negative occasion setting procedure with rats. The feature (light) and target (tone) are each presented for 5 sec and the interval between them on non-reinforced trials is also 5 sec. On reinforced trials, food is delivered immediately after the tone is terminated. B) Model of the associations that are thought to be formed during negative occasion setting [40]. Red and green lines indicate inhibitory and excitatory relationships in the behavioral procedure, respectively (US = unconditioned stimulus). The feature stimulus acts to gate, or ‘set the occasion’ for the meaning of the target stimulus and indicates that a response should be withheld during the subsequent presentation of the target.