Positive thinking might leave you with a hole in your pocket, for according to a new study, looking on the bright side can lead to irresponsible financial behavior.

In the study, Elizabeth Cowley of University of Sydney examined repeat gambling in the face of loss.

From the analysis, she found that people often engage in too much positive thinking, selectively focusing on one win among hundreds of losses when they think back on the overall experience.

"When we want to justify engaging in an activity which could potentially be irresponsible - like gambling - we may need to distort our memory of the past to rationalize the decision," Cowley said.

"People who have frequently spent more money than planned on gambling edit their memories of the past in order to justify gambling again," she added.

In one of the studies, Cowley had her participants play a computer game in which they could win credits with the financial equivalent of one cent per credit. Each participant played the game 300 times. Everyone experienced one big win and one big loss. But for the other 298 games, one half of the group experienced all small losses, while the other experienced all small wins.

Cowley also manipulated the distance between the big win and the big loss.

A week later, participants were surveyed for their memories of the experience. Surprisingly, Cowley found that even some losers remembered having a positive experience. If the big win and the big loss occurred far apart, losers had fond memories and indicated a willingness to spend their own money on the game.