Over time, John, a participant in a longitudinal study, became aware of his own thoughts, feelings, and actions, and consciously revised them when the investigator was present. This is an example of

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This is an example of practice effects, which occur when participants become more skilled or aware of the study's purpose over time and may adjust their behavior accordingly. It is important to consider and control for practice effects in longitudinal studies to ensure that changes over time are not solely due to participant learning or adaptation.

Over Time, John, a Participant in a Longitudinal Study, Became