Abnormalities at norepinephrine and serotonin synapses appear to play a role in which of the following?

How many neural connections exist in each person's brain?

a. billions b. thousands c. millions d. trillions

When levels of testosterone in the bloodstream increase, performance on:

a. verbal tasks generally improves b. verbal tasks generally declines c. spatial tasks generally improves d. spatial tasks generally declines