In 1952, when drugs to fight mental illness appeared, many psychiatrists began to believe that thental illness was caused by changes in the brain's cells. Hence, they began to put more weight on the biological.
西元一九五二年，「抗精神病藥物」的發現，使得多數的精神科醫師開始認為，精神病是腦細胞變化造成的，因此，與生物學上因素有較大的關連。