Is the description-experience gap in risky choice limited to rare events?

The research team gave people two kinds of choices. One was a choice between a sure win versus a double-or-nothing win. The other choice was between a sure loss versus a double-or- nothing loss. In some cases the odds were explained to the volunteer gamblers, and sometimes the players were just left to learn their chances through their experience playing the game.

Surprisingly, most people made the exact opposite choices when they were told the odds, opposed to when they learned about them on their own. With experience, the test subjects started to gamble on the double-or-nothing for wins and they avoided the risky choice for losses. Their gambling tendencies were reversed when they were told the odds.

"We think that people choose in fundamentally differently ways when they are remembering their past wins and losses than when they are thinking about abstract future possibilities," said U of A researcher Marcia Spetch. "When basing choices on memory, people may focus more on the bigger wins and the bigger losses."

Beyond this novel finding, this research provides a new task for studying gambling behaviour that may one day help in understanding risky choice behaviour and gambling addictions. A follow-up study is being conducted by the same research group using the same gambling task, and participants will be hooked up to MRI equipment to identify areas of the brain involved in risky decision making.

The research was led by Spetch and Elliot Ludvig from the U of A's departments of psychology and computing science. Ludvig is now a researcher at Princeton University. The research was published June 1 in the journal PLoS ONE.