References
- Attneave , F. 1974 . “ Multistability in perception ” . In Object, image and illusion , Edited by: Held , R. San Francisco : Freeman .
- Braine , L. G. 1973 . Perceiving and copying orientation of geometric shapes . Journal of Research and Development in Education , 6 : 44 – 55 .
- Crawford-Nutt , D. H. 1975 . Symmetry Completion Test (SYMCO): development of scoring methods . Psychologia Africana , 15 : 191 – 202 .
- Deregowski , J. B. 1972 . Reproduction of orientation of Kohs-type figures: a cross-cultural study . British Journal of Psychology , 63 : 283 – 296 .
- Deregowski , J. B. 1974 . Effects of symmetry upon reproduction of Kohs-type figures: an African study . British Journal of Psychology , 65 : 93 – 102 .
- Deregowski , J. B. 1977 . “ Some cross-cultural thoughts on perceptual continua ” . In Basic problems in cross-cultural psychology , Edited by: Poortinga , Y. H. Amsterdam : Swets & Zeitlinger .
- Ghent , L. 1961 . Form and its orientation, a chilďs eye view . American Journal of Psychology , 74 : 177 – 190 .
- Jahoda , G. 1956 . Assessment of abstract behaviour in a non-western culture . Journal of Abnormal and Social Psychology , 53 : 237 – 243 .
- Jahoda , G. 1976 . Reproduction of Kohs-type drawings by Ghanaian children: orientation error revisited . British Journal of Psychology , 67 : 203 – 211 .
- Jahoda , G. 1977 . Cross-cultural study of factors influencing orientation errors in reproduction of Kohs-type figures . British Journal of Psychology , in press
- Ord , I. G. 1971 . Mental Tests for Pre-Literates , London : Ginn .
- Serpell , R. 1971 . Discrimination of orientation by Zambian children . Journal of Comparative and Physiological Psychology , 75 : 312 – 316 .
- Shapiro , M. B. 1960 . Rotation of drawings by illiterate Africans . Journal of Social Psychology , 52 : 17 – 30 .