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The Effect of Aging on Reversal and Extradimensional Shifts in Jordan

California State University, Fresno

Khamis A. Qassim

University of Jordan, Amman

A two-phase discrimination shift design was used in which 192 Jordanian subjects in the age groups 50-59, 60-69, and 70 years and older were shifted following criterion learning of a discrimination task to either a reversal (R) shift or an extradimensional (ED) shift. Like older children and young adults, subjects in the 50-59 age group executed an R shift faster than an ED shift. Subjects who were 70 years or older, however, found the ED shift easier than the R shift, just as is traditionally found with preschool children. The reversed ontogenetic trend was explained in terms of Kendler and Kendler's two-stage mediational theory.

Journal of Cross-Cultural Psychology, Vol. 9, No. 3, 339-347 (1978)
DOI: 10.1177/002202217893006


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