Stereo (1969)

Sometime in the future, the Canadian Academy for Erotic Inquiry is investigating the theories of parapsychologist Luther Stringfellow. Seven young adults volunteer to submit to a form of brain surgery that removes their power of speech but increases their power for telepathic communication. An unseen group of students observes the results. As the experiment progresses, Stringfellow's theories come to fruition. Later, aphrodisiacs and various other drugs are introduced to the subjects to expose an inherent polymorphous perversity. (SPOILER ALERT!) In the end, they are isolated from each other, provoking antagonism and violence between them, which results in two suicides.