1. Thomas Reid, Essay on the Intellectual Powers of Man,ed. B. Brody (M.I.T. Press, Cambridge, 1969), pp., 138–9.
2. Richard Rorty, `Incorrigibility as the Mark of the Mental,’ Journal of Philosophy 67 (1970), 399–422.
3. George Berkeley, A New Theory of Vision,section 80.
4. Ibid.,section 112.
5. James J. Gibson, The Ecological Approach to Visual Perception ( Houghton Mifflin, Boston, 1979 ).