Suppose that you allow an infant several minutes to study a drawing of a face. Then, you present a second face and assess whether heart rate changes when this additional face appears. This is the ____ method.

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The method described is habituation, which involves presenting a stimulus repeatedly until the individual shows a decrease in response. Introducing a new stimulus and assessing any changes in response is the next step in the habituation paradigm. The other options listed (preference, evoked potentials, high-amplitude sucking) involve different methods of studying infant behavior and perception.

Suppose That You Allow an Infant Several Minutes to Study