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Peacocke Thesis: experience, perception: does never exist without sensation.
Perception Theory/tradition: Thesis: feelings are not part of the perception - Adequacy Thesis: all essential lie in 'appears to the subject ..' plus some complex conditions such as objects and circumstances.
PeacockeVs: it is undecidable whether two trees are the same size and at the same distance, or at different distsances and different in size - and we assume that they are the same size, even if we see different sizes - (added knowledge: brings representation into the game).
Perception/Peacocke: needs terms.
Observation Terms/Theoretical Terms: Square: - must be experienced as such, an X-ray tube not. - For scientists, the X-ray tube may be constructed entirely differently, for a lay person not - in this case it is a different term. - Sensitivity for property: necessary but not sufficient condition: - E.g. 'tomato-like': appearance or taste, here is no theory required. - Square: a minimal theory of perspective is required. - There is nothing 'square-like' what corresponds to 'tomato-like'. - Without square term no sensation of square, (not only no representation). - A perspectively distorted square is perceived as a square, but not perceived as distorted. (> Higher order). - Not so with tomato-like: cannot be known as a tomato. (> Counterfeit). - 'Tomato-like' is not a criterion, otherwise tomato would be an observation term! - Representation: tomato, not 'tomato-like'.
'As'/seeing-as/perception/thinking/Peacocke: E.g. 'This acid burns the table': only liquid is seen, not 'as acid'.
Chr. R. Peacocke
Sense and Content Oxford 1983