Any naturally occurring change within the individual that has an effect on the dependent variable is referred to as a Maturation effect.
Maturity effects are phenomena in which biological or psychological changes that occur in a person over time influence research results. Maturation is likely to undermine the internal validity of findings in a study that focuses on humans.
The term "maturation" refers to the likelihood that natural processes that take place over time in study participants, such as getting older, hungry, tired, wiser, and similar things, may produce a fictitious treatment effect or conceal a real one.
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