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Roderick Chisholm ( 1956 ), G. E. M.

Anscombe ( 1957 ), Peter Geach ( 1957 ), and Charles Taylor ( 1964 ) all adhere to the former position, namely that intentional idiom is problematic and cannot be integrated with the natural sciences.

Members of this category also maintain realism in regard to intentional objects, which may imply some kind of dualism ( though this is debatable ).