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Mean startle amplitude in each group in habituation trials (i.e., startle stimulus trials occurring before the first CS presentation, stripes) was compared with mean startle amplitude in startle-alone trials (i.e., startle stimulus test trials that were intermixed with CS-containing test trials, shading). All three groups exhibited very similar startle response levels in these two trials types, suggesting that fear dissipated completely between successive presentations of the CS.
