There were rumors that Herrmann had used electronic means, including amplified bird screeches to achieve the shocking effect of the music in the shower scene. The effect was achieved, however, only with violins in a "screeching, stabbing sound-motion of extraordinary viciousness." The only electronic amplification employed was in the placing of the microphones close to the instruments, to get a harsher sound. Besides the emotional impact, the shower scene cue ties the soundtrack to birds. The association of the shower scene music with birds also telegraphs to the audience that it is Norman, the stuffed-bird collector, who is the murderer rather than his mother.