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Mean startle amplitude on the individual A and AB test trials of Experiment 3. Startle was elevated on both A and AB test trials relative to NB-alone trials, but the magnitude of this difference was much greater on A trials than on AB test trials, consistent with an inhibitory effect of B on responding to A. Importantly, the difference in responding between A and AB was evident from the first presentations of these stimuli in test, and remained robust throughout the session.
