Your text describes a study in which two-day-old babies were exposed to recordings of normal or backward speech. Blood flow in the babies' brains was measured. Dr. Lalonde wishes to replicate the study. Rather than measuring blood flow, however, Dr. Lalonde wishes to examine the brain's metabolism of glucose. What might Dr. Lalonde predict?
A) Glucose metabolism should increase in the left hemisphere when either the normal or backward speech is played.
B) Glucose metabolism should increase in the right hemisphere when either the normal or backward speech is played.
C) Glucose metabolism should increase in the left hemisphere when the normal speech is played, but not when the backward speech is played.
D) Glucose metabolism should increase in the left hemisphere when the normal speech is played and in the right hemisphere when the backward speech is played.

Question

Quizplus · Accepted Answer

The study found that normal speech activated left hemisphere blood flow in the babies' brains. Since glucose metabolism is an indicator of brain activity, it is likely that glucose metabolism will also increase in the left hemisphere when normal speech is played. However, since backward speech does not activate the left hemisphere, it is unlikely that there will be an increase in glucose metabolism in that area of the brain when backward speech is played. Therefore, Dr. Lalonde would predict that glucose metabolism should increase in the left hemisphere when the normal speech is played, but not when the backward speech is played.

Your Text Describes a Study in Which Two-Day-Old Babies Were