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Sensitization. Mean startle amplitudes in relation to the first trial for both patients and controls (percentage scores, 6SEM), specified for the 8 trials of block 1 (B1) and the 8 trials of block 3 (B3). Controls showed a highly significant increment from trial 1 to trial 3 of block 1 (5sensitization), where patients did not. Clonidine did not affect sensitization.
