Internal Validity Threats in Studies of Adult Cognitive Development

  • K. Warner Schaie
Part of the Springer Series in Cognitive Development book series (SSCOG)


If development is viewed as a process that implicitly requires time to elapse to observe quantitative change or qualitative transformations, it then follows that age-comparative studies or other experimental manipulations can at best simulate development. It is obviously impossible to assign experimental subjects at random to different ages or different measurement occasions. The formal investigation of developmental processes, therefore, typically involves quasi-experiments in which carefully selected population samples are followed over time to observe whether or not hypothesized transformations can indeed be observed.


Practice Effect Cognitive Aging Experimental Mortality Test Occasion Word Fluency 
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© Springer-Verlag New York Inc. 1988

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  • K. Warner Schaie

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