The text tells us something that common sense also tells us: that it is difficult to get people to process a message about a headache remedy when they don't have a headache. This problem is a consumer phenomenon called

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Selective attention is the phenomenon where people only pay attention to the messages that are relevant to their current needs, interests, or goals. In this case, people are less likely to process a message about a headache remedy when they don't have a headache because it is not relevant to their current needs. Other options like attention deficit disorder, cognitive dissonance, and involvement do not accurately describe this consumer phenomenon.

The Text Tells Us Something That Common Sense Also Tells