Page "Thoughtcrime" Paragraph 4

Technology played a significant part in the detection of thoughtcrime in Nineteen Eighty-Four — with the ubiquitous telescreens which could inform the government, misinform and monitor the population.

The citizens of Oceania are watched by the Thought Police through the telescreens.

Every movement, reflex, facial expression, and reaction is measured by this system, monitored by the Ministry of Love.