Which of the following neurochemical profiles has been associated with manic episodes?

A research study involving adults with schizophrenia looked at their facial expressions in home movies taken when they were children. The researchers were trying to determine if the development of schizophrenia could be predicted by facial expressions showing limited emotional reactions. This research study focused on the negative symptom called a. alogia

b. affective flattening. c. associative splitting. d. emotional effect syndrome.

Attention deficit/hyperactivity disorder is one of the most common psychological problems in school-aged children. Researchers estimate that:

a. the disorder affects 3–5% of all children b. approximately 10% of all children are affected by the disorder c. the disorder is evident in nearly 25% of all children d. over 50% of all children are affected by the disorder