Stereo

A group of Canadian university students agree to partake in a grisly psychological experiment, which renders them incapable of speech but able to communicate telepathically.

Stereo is a 1973 sci-fi movie directed by David Cronenberg, starring Iain Ewing, Jack Messinger, Ronald Mlodzik. It holds an IMDb rating of 5.0/10 from 2,885 votes and runs 1h 5m.