 Ayer, Alfred Jules |  Broad, Charlie Dunbar |  Carnap, Rudolf |  color |  Hume, David |  idealism |  intentionality |  knowledge: by acquaintance vs. description |  mental representation |  Moore, George Edward |  neutral monism |  perception: epistemological problems of |  perception: the contents of |  perception: the problem of |  -->Price, Henry Habberley--> |  qualia |  realism |  Reid, Thomas |  Russell, Bertrand |  Sellars, Wilfrid 