Hume-(empiricist)
-Test: "From what (sense)impression is the supposed idea derived?"

-Perceptions (mental things/states)
-(sense)impressions-lively, vivacious (sensing a real object)
-idea-faint copy of an impression used in thinking (imagination memory)

-Descartes-"I think therefore I am"
-Hume-"No I, no self"
-Bundle metaphor-idea that perceptions are bundled together (ex: hot, cold, bored, etc.)
and if we don't know what bundles our perceptions together than how can we know that there is a self?
-Theater metaphor-idea that the mind is like a theater with different ideas and sensations constantly going in and out-but we get no real impression of the theater, only the things we see on stage. If we have no impression of the theater than how can we know that there is a mind?

-Hume rejects idea of cause and effect
-Concepts of cause and effect-
1.) Priority in time (cause must precede the effect)
2.) Contiguity-the objects involved much touch somehow
3.) Necessary connection-idea that "If A happens than B must happen". (Ex: If you hit a cue ball with a pool stick, it has to move)

-Hume says there is no necessary connection
-thinks we believe in cause and effect because of psychological conditioning
-believes necessary connection is a subjective expectation
-"Something is necessary when you can't imagine (if you can't picture it in your mind-you don't have to actually believe it could happen) a cause without it's effect, then there is no necessary connection between cause and effect." (Ex: we can picture Superman flying even though we know that people can't fly)

-Necessary truth = a priori truth
-belief in cause and effect = a posteriori truth

-Fred Dretske-relevant alternative model to refute skepticism
-Zebra example-says that you can know you're looking at zebras without 100% proof that they're not cleverly disguised and painted mules (pg. 53). The point is that you don't have to rule out implausible alternatives in order to have knowledge

-What defines whether and alternative is plausible or not? Seems relativistic