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Internal Validity Threats in Studies of Adult Cognitive Development

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

Abstract

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.

Keywords

Practice Effect Cognitive Aging Experimental Mortality Test Occasion Word Fluency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag New York Inc. 1988

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  • K. Warner Schaie

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