<qa>  What did the primary hypothesis be that PPI and P50 gating would not correlate withWe wanted to compare the relation of two different psychophysiological paradigms PrePulse Inhibition of the startle response PPI and P50 suppression to each other. Additionally, we wanted to test the effect of the combined serotonin- and noradrenaline re-uptake inhibitor, imipramine, on these measures. The primary hypothesis was that PPI and P50 gating would not correlate with each other at baseline. The secondary hypothesis was that increased noradrenergic and serotonergic activity would disrupt PPI as well as P50 gating. 