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The problem with repeated measures designs is that they do not account for order effects. For example:

  • The fatigue effect - participants get tired/bored and so perform worse over time
  • The practice effect - participants becomes more adept at a task over time

It also can be difficult to avoid the participants being aware of demand characteristics. For instance, if they do a spelling test in silence, and then with heavy metal music playing, they might guess what the experimenter is trying to study, and so react accordingly (whether this is a conscious change or not).

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