This study was conducted to investigate decline of abilities to perform Piagetian measures of conservation of surface area, mass, and volume among a volunteer sample of elderly women. All of the 54 volunteer subjects were judged to be middle-class, ambulatory, and approximately “normal, older people” living outside an institute. Subjects had a mean age of 68.60, showed no overt signs of ill health, and appeared to be alert and responsive. Data indicated that a great proportion of the subjects were able to perform all the Piagetian tasks.
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