When faced with a decision, people may know which choice gives them the
best chance of success, but still take the other option, a new study suggests.
People may
choose based on a “gut feeling,” a habit, or what worked for them last time,
rather than on what they have learned will work most often, said Ian Krajbich,
co-author of the study and associate professor of psychology and economics at
The Ohio State University.
The results run
counter to the belief that people make the less optimal choice because they just
don’t know any better.
“In our study,
people knew what worked most often. They just didn’t use that knowledge,”
Krajbich said.
The research, published (April 20, 2020) in the journal Nature
Communications, was led by Arkady Konovalov, a former graduate
student at Ohio State who is now at the University of Zurich in Switzerland.
Krajbich gave an
example of how the study’s findings may work in real life. Say Main Street is
usually the fastest way home from work for you. But yesterday there was an
event that was going to slow traffic on Main Street, so you took Spruce Street
instead and it got you home a few minutes faster than normal.
Today, do you
take Main Street — which you know is usually the better route — or take Spruce
Street because it worked so well yesterday?
Krajbich said
the results of this study suggest that many times we will take the route that
worked yesterday and ignore the evidence of what normally works best.
“There’s this
tension between doing what you should do, at least from a statistical
perspective, versus doing what worked out well recently,” Krajbich said.
In the study,
participants played a simple computer game in which noticing and exploiting
patterns could make them more money. The researchers tracked their computer
mouse movements to detect whether they picked up on those patterns.
For example,
participants would choose one of two symbols on the top half of the screen —
one on the top left and one on the top right. They would then move the cursor
to the bottom half of the screen and a symbol would appear on the bottom right
or bottom left. They would click on that to see their reward.
Participants
repeated this game dozens of times. The researchers could determine if the
participants learned the pattern between what they chose at the top and what
they got at the bottom (for example, choosing the top left symbol usually led
to the bottom right symbol with the largest reward) by watching their mouse
movements.
“We could tell
where they thought the next symbol was going to appear by where they moved the
cursor,” Krajbich said.
“And we found
that nearly everyone — 56 of the 57 participants — learned the pattern. That
was no problem for our participants.”
But the
researchers designed part of the study so that the pattern that usually led to
the largest reward didn’t work 10 to 40 percent of the time.
So the question
was: After one of the trials in which the pattern that usually led to the
largest reward didn’t work, what would participants do? Would they stick to the
pattern or choose something else?
Results showed
that participants followed the plan that gave them the best chance of success —
which was following the pattern that worked at least 6 out of 10 times — only
about 20 percent of the time.
In other parts
of the study, the pattern that produced the biggest reward always worked the
same way. Here, where the pattern was consistent, participants followed it
about twice as often as in the other cases: about 40 percent of the time.
Why don’t people
follow the best strategy more often? While the answer to that is beyond the
scope of this study, Krajbich said it likely takes a lot of mental energy and
planning to always make decisions based on your knowledge of the environment.
And the rewards
of following the best strategy aren’t always obvious — especially if following
that strategy increases your success by only a small percentage, he said.
This tension
between using a statistical-based strategy versus going with your “gut” comes
up a lot in sports, Krajbich said. Coaches and managers must decide whether to
go for it on fourth down in football or walk a batter in baseball. The decision
that has the best chance to succeed statistically is often only a bit more
successful than the other choice.
“It can be hard
to judge whether you made a good or bad decision based just on the outcome. We
can make a good decision and just get unlucky and have a bad outcome. Or we can
make a bad decision and get lucky and have a good outcome,” Krajbich said.
In those
situations, it is easy for people to stop being disciplined and just choose
whatever decision got them rewards most recently.
The lesson from
this study, Krajbich said, is that people often do learn what works best. “They
just have to put that knowledge into practice.”
Journal article: https://www.nature.com/articles/s41467-020-15696-w
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