Report: Amanda Bynes has stopped talking to herself

Amanda Bynes has responded "quickly and dramatically" to treatment for the apparent mental break that saw her hospitalized on a 5150 involuntary hold last month.

Sources say Bynes's doctors have given her a cocktail of psychiatric drugs to treat apparent symptoms of schizophrenia and that the troubled actress has stopped talking to herself and insulting people. Doctors are cautiously optimistic -- the full effects of these complex combinations of medications can take seven to 10 days to fully kick in -- but the shift in her behavior has reportedly been remarkable.

The medical team at Hillmont Psychiatric Center in Los Angeles received a two-week extension on the original 72-hour hold so they could diagnose Bynes after she set a fire in a Thousand Oaks driveway on July 21.

The incident followed months of increasingly odd behavior, where she was thrown out of hotels, wore strange clothes and tweeted bizarre and insulting comments at fellow stars.