The famous memory researcher Hermann Ebbinghaus was his own and only subject; he performed the research tasks himself and measured his own performance

According to a recent study by De Meyer and others, every one of the older adults with mild cognitive impairment who had ________ in their spinal fluid developed Alzheimer disease within 5 years.

oxytocin the amyloid beta acetylcholine the apolipoprotein

Which of the following best illustrates the concept of craving?

A) A man ingests an aspirin to rid himself of a strong headache. B) A hungry rat presses a lever to obtain a food pellet. C) A rat presses a lever that results in delivery of shock through the floor of the chamber. D) A woman injects heroin into her veins to obtain a "rush." E) A "free" injection of cocaine reinstates responding for intravenous cocaine in a rat that previously underwent extinction of cocaine responding.