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There are citations in Schwebel (Voyat wrote Ch 7): pvii: been a student, assistant, and colleague of Jean Piaget's, and her special in- terests have been in the areas of cognitive development and in ... In this connection he has conducted various comparative studies and workshops among Sioux Indian teachers and children vii.... Voyat mentions his changed seriation task with S Ch¡¯n on p165/6 Dasen cites it: Cross-Cultural Piagetian Research: A Summary Pierre R. Dasen Journal of Cross-Cultural Psychology, 1972 And Cross-Cultural Study of Cognitive Development on the Pine Ridge Indian Reservation. Pine Ridge Research Bulletin, n11 Jan 1970 The research summarized in this paper was conducted on the Pine Ridge Indian Reservation in South Dakota. The purpose of the developmental study was to explore the cognitive aspect of development rather than to explore the personality as a whole. The Clinical Exploratory Method of Piaget was employed, which focuses primarily upon an experimental investigation of the qualitative development of intellectual structures, because it was expected that Piaget's system would be free of cultural bias. Some hypotheses tested were (1) Are Piaget's tests insensitive to basic differences in the sequence of stages of cognitive development? (2) Are there time delays or time advances in the population? and (3) Are time delays observed between ethnic groups consistent, or is a delay within one ethnic group offset by a relative advance in some other area? The methodology of this research consisted of adapting the interview to the reactions of the 75 Oglala Sioux children, aged 4 through 10, who were tested. The results indicated that the succession of stages described by Piaget is respected by both the Pine Ridge and the Geneva population. Further, there was shown to be no fundamental delay in the development of the basic processes in thinking among the population in Pine Ridge. It was also found that basic processes in cognition are more a function of an active organization process that the child brings upon his experience than is the role that language plays in the thought process. (HBC) And most of his work is listed here: http://scholar.google.com.au/scholar?start=10&q=author:G+author:Voyat&hl=en&as_sdt=0,5