I totally agree. But neurological disorders can be worsened or made apparent by mental confidence / mindsets and issues. There is still a neurological tie as to the pathways in our brain that perform speech - which is learnt as well as genetically apparent. I don't think it's a good route to seperate it from that completely - they both can co-exist and create the conditions for stuttering. Science about our bodies in many aspects is growing, improving, and helps us have power!