I'll clarify a bit - I mentioned researching studies that address mood control on the premise that stuttering can be triggered and/or worsened by stress and irritation (a bad mood). Once I research those details myself I'll share them on the reddit! You also mentioned how you've had a year where your stuttering was fluent regardless of depression and shitty mornings. Because of the countless factors that can affect speech, it's hard to say why that was. I certainly can't answer that, lol. Regarding the neurophysiological part, I have been studying stutters more in depth for a few years now, and I have yet to find a recent study or medical journal that does *not* call it neurophysiological. Some will also call stuttering by it's other name "dysphemia", which makes it easier sometimes to find those studies. I used to pay to access certain databases with these studies, but I don't have that atm unfortunately. Also I like the "fear does not equal stuttering" quote. Fluency is fragile, but fear doesn't have to get in its way.