1. Attneave, F., &Olson, R. K. Discriminability of stimuli varying in physical and retinal orientation.Journal of Experimental Psychology, 1967,74, 149–157.
2. Cooper, L. A., &Shepard, R. N. Chronometric studies of the rotation of mental images. In W. G. Chase (Ed.),Visual information processing. New York: Academic Press, 1973.
3. Corballis, M. C., Zbrodoff, N. J., Shetzer, L. I., &Butler, P. B. Decisions about identity and orientation of rotated letters and dlgtts.Memory & Cognition, 1978,6, 98–107.
4. Hock, H. S., & Hilton, T. Spatial coding and oblique discrimination by children.Journal of Experimental Child Psychology, in press.
5. Rock, I. Orientation and form. New York: Academic Press, 1973.