Perry is the lead singer for a jazz group called John's Prediction, for which he has learned several jazz songs. After a couple of years, he decides to join a blues group called Petrol for Pinholes, and he learns a number of blues songs. On stage one night, he tries to remember a jazz song from John's Prediction and hasdifficulty in doing so. Perry is showing evidence of ____.?

People living under stressful conditions tend to get sick more often than they would otherwise

How do researchers in psychoneuroimmunology explain this phenomenon? A) The stress response reduces immune system functioning, thus making us more vulnerable to diseases. B) The stress response in the long run leads to a lowering of the heart rate, which makes the heart inefficient. C) The stress response makes muscles stronger, which places a greater burden on the heart and respiratory systems. D) The body tends to adapt to the constant call for the stress response and, thus, future responses are not as strong as before.

The attention span of the average fourth-grader is much longer than that of the average first grader. Which of the following biological changes is primarily responsible for this?

A) Increased growth of the corpus callosum B) Continued myelination of the optic neurons and their connections to the occipital lobe C) Continued myelination of the frontal lobes and reticular formation and the nerves that link the two D) Rapid growth of the reticular formation