Subjective and private: others can"t directly know our reality (and vice versa) Difficult topic to study: started when wundt & titchener started studying introspection, fell out of favour, became unpopular because of introspection. Infer much from absence of consciousness: unconsciousness: just inaccessible. Freudian unconscious or an unconscious act: non conscious: have access to it if you want to, but at that point in time you aren"t aware (or something along those lines) E. g. while driving: aren"t sure whether you passed a certain road or not. Perform many mental functions without being aware of it. Blindsight: http://www. youtube. com/watch?v=rundkcbq8py: blindsight: able to detect thing, but unaware of it, vision is not entirely seeing, don"t know extent of awareness, need visual cortex to consciously see things, lizard must be aware to catch flies to eat. Non-conscious : something is working, we"re just not actively aware of it, automatized routines, nowadays when we mention unconscious it"s referring to non-conscious.