![]() ![]() But some will make fake calls, and then steal food left by those that scattered. Capuchin monkeys use predator alarm calls to warn fellow monkeys to scatter and avoid threats. The drug reduced the urges to steal and stealing behavior, Grant and colleagues wrote in the journal Biological Psychiatry. Naltrexone blocks the effects of substances called endogenous opiates that the researchers suspect are released during stealing and which trigger the sense of pleasure in the brain. In a study in 2009, participants either took a placebo or the drug naltrexone - known to curb addictive tendencies toward alcohol, drugs and gambling. Grant of the University of Minnesota School of Medicine. ![]() ![]() "These are people who steal even though they can easily afford not to," says Jon E. One study of 43,000 people found 11 percent admitted to having shoplifted at least once. ![]() But for kleptomaniacs, stealing can be motivated by the sheer thrill of it. (Image credit: Hands in hand cuffs image via Shutterstock ) Scroll up to click to the next item: Stealing We steal Humans certainly rank among the most violent of species," says biologist David Carrier of the University of Utah. "Aggressive behavior has evolved in species in which it increases an individual's survival or reproduction, and this depends on the specific environmental, social, reproductive, and historical circumstances of a species. Many researchers believe violence in humans is an evolved tendency that helped with survival. "We have found that the reward pathway in the brain becomes engaged in response to an aggressive event and that dopamine is involved." "Aggression occurs among virtually all vertebrates and is necessary to get and keep important resources such as mates, territory and food," said study team member Craig Kennedy, professor of special education and pediatrics at Vanderbilt University in Tennessee. The researchers think the finding applies to human brains. The study, reported in the journal Psychopharmacology, found that in mice, clusters of brain cells involved in other rewards are also behind their craving for violence. However, going back millions of years, evidence suggests our ancient human ancestors were more peace-loving than people today, though there are signs of cannibalism among the earliest pre-history humans.Ī study in 2008 concluded that humans seem to crave violence just like they do sex, food, or drugs. Some researchers figure we crave violence, that it's in our genes and affects reward centers in our brains. Skeletons of 27 people show signs of projectile wounds and blunt force trauma. The oldest evidence of human warfare dates back 10,000 years ago. Scroll up to click to the next item: Violence We crave violenceĪ boxer punching. However, a study in 2014 found that white lies, for the right reasons, can can strengthen relationshipsĪnimals are also known to be capable of deception, and even robots have learned to lie, in an experiment where they were rewarded or punished depending on performance in a competition with other robots. Anything else falls outside the definition of lying that I have defended." Second, the person making the statement must intend for the audience to believe that the statement is true. "First, a person must make a statement and must believe that the statement is false. "Certain conditions have to be in place for a statement to rise to the level of a lie," explains philosophy professor James E. Figuring that out requires coming up with a complicated definition of lying. It's a whole other matter whether people really mean to lie in many instances. Recent studies have found that people lie in workplace e-mail more than they did with old-fashioned writing. One study concluded that lying takes 30 percent longer than telling the truth. ![]()
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