Rodney is focusing on the individual sounds, rhythm, and intonation of the language his family speaks. How old is Rodney?

Schizophrenia is diagnosed by

(a) behavioral symptoms (b) a blood test (c) MRI (d) a genetic marker on a known chromosome

After a "split-brain" operation, most people

a. show severe impairment of language ability. b. show constant competition between the two hemispheres. c. function relatively normally, unless submitted to specialized testing. d. show a change in hand dominance.