According to researchers who investigated stuttering recovery, research findings did not support a singular technique or therapy for achieving subconscious fluency. Nevertheless, the results do indicate that individuals who achieved complete recovery often attributed it to self-changes (as opposed to true spontaneous recovery). See [this](https://www.sciencedirect.com/science/article/pii/S0021992418300789) and [this](https://drive.google.com/file/d/1TovEdGkKJXete-asn6u5qTTEnUdNRoVB/view?usp=sharing) research study.