Carryover Effect
The repeated measures design (also known as a within-subjects design) uses the same subjects with every condition of the research, including the control. For instance, repeated measures are collected in a longitudinal study in which change over time is assessed. Other studies compare the same measure under two or more different conditions. For instance, to test the effects of caffeine on cognitive function, a subject's math ability might be tested once after they consume caffeine and another time when they consume a placebo.
Read more about Carryover Effect: Crossover Studies, An Example of A Repeated Measures Design, Uses of A Repeated Measures Design, Practice Effects, Repeated Measures ANOVA
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—Max Beerbohm (1872–1956)