The ________ of sound allows us to distinguish a guitar note from a saxophone note

The "season of birth" effect coupled with antibody studies links schizophrenia to:

a. A viral infection. b. Malaria. c. HIV. d. Poor parenting.

Daytime stress tends to increase __________ sleep

a. REM b. NREM stage 2 c. NREM stage 3 d. NREM stage 4