Raine et al increased the validity of their study by ensuring that they controlled any possible factors that could've changed the participants' violent behaviour, such as individual difference which was controlled by using a matched pairs design and stopped all medications.
One strength of the study was that they used a biological measurement which cannot be affected by demand characteristics. The participants would not be able to alter their brain activity with what the researchers would've wanted. this increases both validity and reliability.
The data appears to show that there is a relation with two variables (activity in the brain and violent behaviour). We will never know if the brain activity caused violent behaviour, or if the violent behaviour caused the brain activity. There may have been other variables that were not controlled. Therefore, the results need to be treated with caution.
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