Some stutterers think that because they stutter when they talk to themselves that means its neurological by nature but i remember a few years ago sabotaging this process to myself when i started learning about how stuttering has a very large psychological component i remember realizing that i dont stutter while talking to myself or reading so i started talking to myself endlessly then i became self conscious and started fearing stuttering even when talking to myself then i self sabotaged and started stuttering to myself. Did my brain suddenly catch a neurological disease which led me to start stuttering talking to myself endlessly? No . But i increased my self pressure and expectations of a perfect speech and that backfired into actual stuttering.