Akira's parents report that for the last two years Akira (age 10) has become a "very difficult child," And they do not know what to do. They tell the psychologist that Akira seems to have high euphoric moods and low moods when he is irritable, but most of all he has severe outbursts of temper and destruction that come out of nowhere. According to Akira's parents, these outbursts of rage are happening about four times a week both at home and at school. Akira's parents are worried because his teachers are starting to express great distress and none of Akira's friends seem to show this kind of behavior. The psychologist is most likely to diagnose Akira as having