Professor Stevenson and his colleagues observed the motor behavior of children following the administration of a drink with food additives or a drink without the additives. Neither the children nor their observers knew which kind of drink each consumed. This experimental procedure is designed to control for

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The experimental procedure is designed to control for placebo effects, as neither the children nor their observers knew which kind of drink each consumed. This ensures that any observed effects can be confidently attributed to the presence or absence of food additives, rather than expectations or beliefs about the effects of the drink.

Professor Stevenson and His Colleagues Observed the Motor Behavior of Children