Every person has conditioned emotional responses to each of these: tired, sleepy, hungry, thirsty, having consumed more than two cups of coffee or too much sugar, nicotine, or alcohol.

Every person has conditioned emotional responses to each of these: tired, sleepy, hungry, thirsty, having consumed more than two cups of coffee or too much sugar, nicotine, or alcohol.

Conditioned Response Over Sotomayor 3 minute read By TIME Staff May 27, 2009 4:10 PM EDT ...