Study: Gambling is normal animal behavior
Friday, October 15th, 2010We are learning more and more about gambling and why it is to attractive to humans. It has long been thought that gambling – in whatever form – was a natural part of human instinct. However, a recent study shows that the instinct and the urge to gamble is not just present in humans, but in animals as well.
A recent study published in the October 13 edition of Proceedings of the Royal Society B – a biological sciences journal – found that gambling is a natural behavior for pigeons. The research, conducted by University of Kentucky psychologist Thomas Zentall, found that, given a choice, pigeons would rather have a 20% chance of getting a 10-pellet jackpot than a 100% chance of getting three pellets.
In the study, pigeons were trained to peck white lights to obtain food pellets. Once they were classically conditioned to expect the response of getting food from pecking the light, the payouts changed. There was a light on the left side of the cage and one of the right side. On the right side, when the pigeons pecked the light, they would see a yellow or blue color and, after a 10 second delay, they would receive three food pellets. They would receive that three-pellet payout every time.
On the left side, when the pigeons pecked the light, they would see either a red color or a green color. If the color was red, 10 seconds later they would receive 10 food pellets. If the color was green, they would not receive any pellets. The red color appeared 20% of the time.
In the experiment, after enough trial runs to learn the pattern, the pigeons “went after the 10-or-nothing outcome 82% of the time,” according to the study. Though getting three pellets 100% of the time is both a safer bet and, in the long run, provides more food, it was a less attractive bet for the pigeons.
The experiment was then conducted in various other ways to add more variables, yet the result was always the same. The pigeons were more interested in the possibility of a big payout than in the assurance of getting something. Similar behaviors have been found in monkeys as well, as in a study by Duke University neurobiologist Michael Platt.
Zentall believes that the driving force behind the pigeons’ gambling is that they are motivated by a change from their expectations. Because they always get what they expect from one side (three pellets), it is less attractive than the side where getting 10 pellets is a welcome surprise from the possibility of getting none. Zentall believes that the same phenomenon can explain why humans can ignore money lost on casino games and focus on the wins. Though the wins happen less often, they are more surprising and thus, more exciting.
