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Effects of placebo, ketanserin (40 mg), psilocybin (260 μg/kg), and psilocybin in combination with a pretreatment of ketanserin on prepulse inhibition (PPI) of the acoustic startle response in healthy human volunteers. Significant differences compared with placebo are indicated by **pTukey post hoc=0.01. Mean scores±SEM (pooled prepulse intensities, n=16). ISI, interstimulus-interval; ket, ketanserin; ket + psi, ketanserin + psilocybin; pla, placebo; psi, psilocybin.
