Ideas from 'A Dictionary of Philosophy' by A.R. Lacey [1976], by Theme Structure

[found in 'A Dictionary of Philosophy' by Lacey,A.R. [RKP 1976,0-7100-8362-9]].

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12. Knowledge Sources / B. Perception / 4. Sense Data / a. Sense-data theory
Maybe 'sense-data' just help us to talk about unusual perceptual situations
                        Full Idea: One possibility is that talk of sense-data is a mere linguistic convenience, providing a noun for talking about appearances, as when seeing a red object in sodium light (when it looks grey).
                        From: A.R. Lacey (A Dictionary of Philosophy [1976], p.196)
                        A reaction: The term seems to have been coined to deal with situations where there is a gap between appearance and presumed reality, as in illusions. Maybe illusions prove the existence of sense-data, rather than it being a 'convenient' term.
12. Knowledge Sources / B. Perception / 4. Sense Data / b. Nature of sense-data
Where do sense-data begin or end? Can they change? What sort of thing are they?
                        Full Idea: It is hard to individuate sense-data, saying where one ends and the next begins, and hard to say whether they can change; are they substances, qualities, events, or what?
                        From: A.R. Lacey (A Dictionary of Philosophy [1976], p.196)
                        A reaction: The problem is not that these questions are unanswerable. The answer seems to be either that they are physical and external, or that they are mental and internal, and that there is no ontological space for them between the two.
Some claim sense-data are public, and are parts of objects
                        Full Idea: Sometimes it is said that sense-data are public, and parts either of objects or of the surfaces of objects.
                        From: A.R. Lacey (A Dictionary of Philosophy [1976], p.196)
                        A reaction: This suggests two drastically different theories, one making sense-data into mental events, the other placing them in the 'external' world. The latter theory can dovetail them with the physics, but then why would we need them?