Fig. 4.

Conditioned Inhibition. This experiment had four stages. (A) Schematic representation of the acquisition phase (days 1 to 4) where CS A (red box) and a CS B (light blue box) were paired with food delivery. (B) Schematic representation of the subsequent inhibitor training phase (days 5 to 7) where three stimuli were presented: CS A+, CS B+ and AC− where C was the LED-light (orange box). C) Responses per minute for stimuli obtained by subtracting the scores for CS A+ or CS B+ or AC− from pre-CS. (D) Schematic representation of the summation test (day 8) where two stimuli were presented: CS B− and BC− where C was the LED-light (orange box). (E) Schematic representation of the retardation test (days 9 and 10) where the LED-light C (orange box) is rewarded with food. (F) The BC/(BC)+ (B) suppression ratio was employed to represent the results. (G) Responses per minute for light stimulus obtained by subtracting the scores for C+ from pre-CS. Values represent the mean ± SEM. ^**p < 0.01. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)