In the 1950s, when the drugs we now call ‘antipsychotics’ first came along, psychiatrists recognised that they were toxic substances that happened to have the ability to suppress thoughts and emotions without simply putting people to sleep in the way the old sedatives did. The mental restriction the drugs produced was noted to be part of a general state of physical and mental inhibition that at extremes resembled Parkinson’s disease. Early psychiatrists didn’t doubt that this state of neurological suppression was potentially damaging to the brain.