Front-most part of cortex in brain `helps predict future events`

In a new study, researchers have discovered how a part of the brain, the front-most part of the frontal lobe – known as the frontopolar cortex, helps predict future events from past experiences.

The study was done by Researchers at the University of Iowa, together with colleagues from the California Institute of Technology and New York University.

Making the best possible decisions in a changing and unpredictable environment is an enormous challenge. Not only does it require learning from past experience, but it also demands anticipating what might happen under previously unencountered circumstances.

Past research from the UI Department of Neurology was among the first to show that damage to certain parts of the frontal lobe can cause severe deficits in decision making in rapidly changing environments.

The new study from the same department on a rare group of patients with damage to the very frontal part of their brains reveals a critical aspect of how this area contributes to decision making.

“We gave the patients four slot machines from which to pick in order to win money,” Christopher Kovach, Ph.D., a UI post-doctoral fellow in neurosurgery and first author of the study, said.

“Unbeknownst to the patients, the probability of getting money from a particular slot machine gradually and unpredictably changed during the experiment.

“Finding the strategy that pays the most in the long run is a surprisingly difficult problem to solve, and one we hypothesized would require the frontopolar cortex,” he said.

Contrary to the authors’ initial expectation, the patients actually did quite well on the task, winning as much money, on average, as healthy control participants.

“But when we compared their behavior to that of subjects with intact frontal lobe, we found they used a different set of assumptions about how the payoffs changed over time,” Kovach said.

“Both groups based their decisions on how much they had recently won from each slot machine, but healthy comparison subjects pursued a more elaborate strategy, which involved predicting the direction that payoffs were moving based on recent trends.

“This points towards a specific role for the frontopolar cortex in extrapolating recent trends,” he said.

The study’s innovative approach to understanding the function of this part of the brain used model-based analyses of behavior of patients with specific and precisely characterized areas of brain damage.

The patients were members of the UI’s world-renowned Iowa Neurological Patient Registry, which was established in 1982 and has more than 500 active members with selective forms of damage, or lesions, to one or two defined regions in the brain.

Kovach’s colleague and study author Ralph Adolphs, Ph.D., professor of neuroscience and psychology at the California Institute of Technology, said that the study results “argue that the frontopolar cortex helps us to make short-term predictions about what will happen next, a strategy particularly useful in environments that change rapidly – such as the stock market or most social settings.”

“The University of Iowa is one of the few places in the world where you could carry out this kind of study, since it requires carefully assessed patients with damage to specific parts of their brain,” study author Daniel Tranel, Ph.D., UI professor of neurology and psychology and director of the UI Division of Behavioral Neurology and Cognitive Neuroscience, said.

In a final twist to the finding, the strategy taken by lesion patients was actually slightly better than the one used by comparison subjects. It happened that the task was designed so that the trends in the payoffs were, in fact, random and uninformative.
“The healthy comparison subjects seemed to perceive trends in what was just random noise,” Kovach said.

This implied that the functions of the frontopolar cortex, which support more complex and detailed models of the environment, at times come with a downside, setting up mistaken assumptions.

“To the best of my knowledge this is the first study which links a normal tendency to see a nonexistent pattern in random noise, a type of cognitive bias, to a particular brain region,” Kovach added.

The findings have been published in the Journal of Neuroscience.