After witnessing a horrible murder, Susan has become "blind" even though there is nothing wrong with her eyes, and she should be able to see. Susan is suffering from a(n) __________ disorder

Which of the following statements is true of stage 4 sleep?

A) It produces low-amplitude brain waves. B) It is the lightest stage of sleep. C) During stage 4 sleep, the delta waves produced by the brain slow to about 0.5 to 2 cycles per second. D) During stage 4 sleep, the delta waves produced by the brain have a frequency of 8 to 13 cycles per second.

Within a synaptic gap, monoamines are deactivated in the synaptic gap by a. reuptake

b. diffusion. c. enzymes. d. enzymes and reuptake.