Finally, Professor Smith tested the same full-term and pre-term infants again at 9 months of age. This time he showed them pictures with 12 objects repeatedly until their looking times decreased by 50% and then showed them new pictures with 18 objects. This is an example of

Question

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This is a longitudinal study because the same group of infants were tested at multiple time points to assess changes in their behavior.

Finally, Professor Smith Tested the Same Full-Term and Pre-Term Infants