Reddit reviews The Terminal Man

This sounds depressingly similar to the plot of one of Michael Crichton's early novels, The Terminal Man.

Right down to the closed-loop system, detecting disapproved brain states and stimulating to disrupt them.

For those of you who haven't read it, the implant system uses brain pleasure terminals to disrupt seizures. What the brain learns from this is that it gets pleasurable stimulation whenever it seizes, so a positive feedback loop starts up.

In the book the subject's seizures include sexual assault and murder.