is the appropriate term. A longstanding controversy surrounding PCS concerns the nature of its etiology – that is, the cause behind it – and the degree to which psychological factors and organic factors involving brain dysfunction are responsible. The debate has been referred to as 'psychogenesis versus physiogenesis' (psychogenesis referring to a psychological origin for the condition, physiogenesis to a physical one). See also Daniel Amen, post-concussion expert for the National Football League References External links Neurotrauma Syndromes Mental disorders due to brain damage Concussions