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. 2009 Oct 20;4(10):e7362. doi: 10.1371/journal.pone.0007362

Figure 7. Effect of equivalent ITI states on δ signals at conditioned stimuli.

Figure 7

(A) A state-space for classical conditioning. (B, C, D) Learning signaled reward delivery. (B) Untrained: δ occurs at US but not CS. (C) Trained: δ occurs at CS but not US. (D) Overtrained: δ occurs at neither CS nor US. (E–H) Transfer of value-error δ signal. Left panels show the first 50 trials, while right panels show trials 1000 to 10,000. Y-axes are to the same scale, but x-axes are compressed on the right panels. Increasing the number of equivalent ITI states increases the time to overtraining. Compare [32].