"Montague’s experiments go like this: A subject is given $100 and some basic information about the stock market. After choosing how much money to invest, the player watches as his investments either rise or fall in value. The game continues for 20 rounds, and the subject gets to keep the money. One interesting twist is that instead of using random simulations of the market, Montague relies on real data from past markets, so people unwittingly “play” the Dow of 1929, the S&P 500 of 1987 and the Nasdaq of 1999. While the subjects are making their investment decisions, Montague measures the activity of neurons in the brain.
At first, Montague’s data confirmed the obvious: our brains crave reward. He watched as a cluster of dopamine neurons acted like greedy information processors, firing rapidly as the subjects tried to maximize their profits during the early phases of the bubble. When share prices kept going up, these brain cells poured dopamine into the caudate nucleus, which increased the subjects’ excitement and led them to pour more money into the market. The bubble was building.
But then Montague discovered something strange. As the market continued to rise, these same neurons significantly reduced their rate of firing. “It’s as if the cells were getting anxious,” Montague says. “They knew something wasn’t right.” And then, just before the bubble burst, these neurons typically stopped firing altogether. In many respects, these dopamine neurons seem to be acting like an internal thermostat, shutting off when the market starts to overheat. Unfortunately, the rest of the brain is too captivated by the profits to care: instead of heeding the warning, the brain obeys the urges of so-called higher regions, like the prefrontal cortex, which are busy coming up with all sorts of reasons that the market will never decline. In other words, our primal emotions are acting rationally, while those rational circuits are contributing to the mass irrationality.
This is a costly mental mistake. Montague notes that investors who listened to the prescient dopamine neurons would earn much more money than the typical subjects, largely because they would get out of the market before it was too late. “It’s crazy to think that there’s a signal in our head that’s so much smarter than we are,” Montague says."
Friday, November 05, 2010
How Our Brains Help Create Financial Bubbles
See Microscopic Microeconomics. It was in last Sunday's New York Times magazine. It described research where people were given money to invest in a stock market simulation (that actually mimicked real history). How people felt about the changes in the market and the money they were making was monitored. Here is a description of the expirement and the results. It seems like we get excited about the gains, the primitive part of our brains get a little fearful, realizing that the stock prices are too much, but the rational part of our brain tries to come up with reasons to explain why (it reminds me of the book This Time Is Different: Eight Centuries of Financial Folly-here is a review Recession, You Look Familiar)