When the department of theater at the University of Chile invited Bloch to teach a psychology course to their students, she proposed an experimental research workshop in emotions instead. The workshop moved forward, and drama professor Pedro Orthous and neurophysiologist Guy Santibáñez joined her. During this collaboration they discovered "emotional effector patterns" and named their work the "BOS Method" (after their surname initials). The Chilean coup d'état on 11 September 1973 brought an end to their studies. Bloch moved to France, Santibáñez moved to a different country, and Orthous died the following year.