In a Study of Human Development, Investigators Showed Two Different

question 35

Multiple Choice

In a study of human development, investigators showed two different types of movies to groups of children. Crackers were available in a bowl, and the investigators compared the number of crackers eaten by children watching both movies. One type of movie was shown at 8 A.M. (right after the children had breakfast) and the other type of movie was shown at 11 A.M. (right before the children were to have lunch) . It was found that more crackers were eaten during the movie shown at 11 A.M. than during the movie shown at 8 A.M. The investigators concluded that the different types of movies had different effects on appetite. The results cannot be trusted because:

• A)the study was not double blind-neither the investigators nor the children should have been aware of which type of movie was being shown.
• B)the investigators were biased-they knew beforehand what the study would show.
• C)the investigators should have used several bowls, with crackers randomly placed in each.
• D)the time each movie was shown is a confounding variable.

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Definitions:

Regulate Body Temperature

The physiological processes that maintain a stable internal body temperature despite external environmental changes.

Regulate Heart Rate

The adjustment of the frequency of heartbeats, controlled by the autonomic nervous system and various hormones.

Corpus Callosum

A large band of neural fibers connecting the two hemispheres of the brain, facilitating communication between the two sides.

Commissural Fibers

Axons that connect the left and right cerebral hemispheres of the brain, facilitating communication between them.