PSYC 3330 Chapter Notes - Chapter 15: Prospective Memory, Episodic Memory, Semantic Memory
9 Apr 2016
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A sample of people, preferably selected so as to reflect the full range of the population, will be tested repeatedly. Advantage is that the effects of age on the performance of each individual can be studied, allowing specified individuals (e. g. alzheimer"s) to be singled out and their performance before the onset compared with that of more fortunate healthy people. Longitudinal designs: the same participants are successively tested at different ages. Some participants will drop out: measures of cognition and memory (i. e. practice effects) Practice effects avoided with cross-sectional designs: different groups of people are sampled across the age range and their performance is o o measured on a single occasion. Limitation: one cannot related performance to earlier data, or to future development of the individual. Cohort effect: the tendency for people born at different time periods to differ as a result of historic changes in diet, education and other social factors.
