Which treatment was first used in the 1930s to treat schizophrenia but is now used primarily to treat severe depression?

Question

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Electroconvulsive therapy (ECT) was first used in the 1930s to treat schizophrenia, but it is now primarily used to treat severe depression. Insulin coma therapy and prefrontal lobotomy are no longer used as treatments for any mental illness. Psychosurgery is still sometimes used as a treatment for certain severe and treatment-resistant mental disorders, but it was never widely used for schizophrenia.

Which Treatment Was First Used in the 1930s to Treat