Parkinson's disease is a neurological disorder that typically afflicts people over 50 and is more common in men than women. Its most striking symptoms include tremor (in the hands, legs, jaw and face), stiffness, slowness and problems with balance and coordination. Parkinson's is chronic and progressive, usually starting with a...

In the 1930s, the psychologist B. F. Skinner devised the operant conditioning chamber, or "Skinner box," in which a lever press by an animal triggered either a reinforcing stimulus, such as delivery of food or water, or a punishing stimulus, such as a painful foot shock. Rats placed in a...

From Paris to New York to Los Angeles the cry rings out, "What the hell were they thinking?" We're irresistibly drawn to the stories of Anthony Weiner, Dominique Straus-Kahn and Arnold Schwarzenegger by the conundrum they offer. How could these smart, savvy, charismatic men of power make the impulsive decisions...