In my opinion, it's linked to how we conditionally wired ourselves, for example: a condition: 'I blame anxiety to stop breathing out during a speech block'.However, there are many stutterers who also stutter without anxiety. From what I read in research, the most blamed condition is 'anticipation' like a thought "I won't/can't move my tongue during a block" or an anticipatory feeling. Whatever reason we associated to 'stop breathing out or stop moving our mouth' results in reacting to this anticpatory anxiety resulting in a fight flight **freeze** response. This **freeze** response is how we stop moving our tongue/jaw or stop breathing out resulting in a speech block - which is a learned behavior. There are many ways to unlearn a 'learned behavior' in psychology, for example, awareness + intention + learning in order to weaken the stutter association. I urge you to google for 'learned behavior' and check with a therapist or psychologist how to best tackle your specific stutter triggers - like anxiety and anticipation, and learned behaviors