Although panic attacks seem to occur out of nowhere, they in fact usually occur in the aftermath of stress, prolonged emotion, specific worries, or frightening experiences

A major cognitive advance made during the sensorimotor stage is the ability to

a. think abstractly and creatively. b. solve simple problems using mental representation. c. understand that the self is distinct from other people and objects. d. create mental images of objects that are not physically present. e. know that changes in appearance do not mean that the object itself changes.

Kelsey, age 10, is impulsive. During school, he drops his pencil, rearranges the papers inside his desk, and yells at people across the room. Kelsey fails to follow the rules when he plays games and lashes out with hostility when he is frustrated

He suffers from both academic and social problems. Kelsey most likely has A) Down syndrome. B) an anxiety disorder. C) autism. D) attention-deficit hyperactivity disorder (ADHD).