" You became conscious of precisely what you unconsciously intended to say only when you said it. You modify your speech depending on wether you are talking to child, a colleague, a student, or a dean. Not consiously, most probably. Paradoxically, speech is usually considered the case of conscious behavior - behavior for which we hold people responsoble. Certainly, it require consciousness: you cannot have a conversation while in deep sleep or in coma. Nevertheless, the activities that organize your speech output are not conscious activities. Speaking is a highly skilled business, relyling on uncounscious knowledge of precisely what to say and how. "

― Patricia S. Churchland , Touching a Nerve: Our Brains, Our Selves