The purpose of the present study was to establish a short paradigm for the examination of classical aversive conditioning
processes for application in patients with anxiety disorders. We measured behavioral, autonomic and neural correlates of the
paradigm in healthy subjects, applying functional magnetic resonance imaging (fMRI) and measurement of skin conductance. Therefore,
neutral visual stimuli were paired with an unpleasant white noise as unconditioned stimulus. Twenty healthy subjects performed
three experimental phases of learning: familiarization, acquisition and extinction. Subjective ratings of valence and arousal
after each phase of conditioning as well as skin conductance measurement indicated successful conditioning. During acquisition,
fMRI results showed increased activation for the conditioned stimulus (CS+unpaired) when compared with the non-conditioned stimulus (CS−) in the right amygdala, the insulae, the anterior cingulate cortex
and the parahippocampal gyrus, all regions known to be involved in emotional processing. In addition, a linearly decreasing
activation in the right amygdala/hippocampus for the CS− across the acquisition phase was found. There were no significant
differences between CS+ and CS− during extinction. In conclusion, the applicability of this paradigm for the evaluation of
neural correlates in conditioning and extinction processes has been proven. Thus, we present a promising paradigm for the
examination of the fear-circuit in patients with anxiety disorders and additionally effects of cognitive-behavioral interventions.
Keywords Classical aversive conditioning - Amygdala - Anxiety disorders - Extinction - Panic disorder