Whenever Valerie experiences intense feelings of fear, she is overwhelmed with childhood memories of her abusive parents. Valerie's experience best illustrates:

__________ refers to how the infant responds to different levels of stimulation, __________

concerns the infant's attempt to cope with the stimuli. Fill in the blanks with correct word

Injections of the serotonin precursor, 5-hydroxytryptophan,

A) reverse the insomnia produced in cats or rats by the serotonin antagonist PCPA. B) reverse the sleep increases produced in mice by PCPA. C) are effective in the treatment of human insomnia. D) are effective in the treatment of human hypersomnia E) reverse the increases in delta sleep produced in volunteers by sleep reduction.