Research suggests people underestimate numerical guesses when leaning left

December 14, 2011 by Bob Yirka report
The Eiffel Tower. Image: Wikipedia.

(Medical Xpress) -- In one of those, who would have ever thought of that, ideas, Anita Eerland and colleagues at Erasmus University Rotterdam in the Netherlands, have found that we humans have a tendency to go low when making numerical estimates about things if our body is leaning slightly to the left. A very strange idiosyncrasy if ever there was one. Eerland and her team, as they describe in their paper published in Psychological Science, set up a series of experiments to prove the idea and found that the vast majority of people when asked to estimate the height of the Eiffel Tower for example, tend to offer lower answers when their body is made, unbeknownst to them, to lean slightly to the left.

To test for such an odd thing, the team enlisted a group of 91 volunteer undergraduate students and asked each of them to make estimations about some random things they didn’t actually know the answers to, while standing atop a Wii balance board.

In the first such experiment, a subset of the volunteers were asked to make estimations based on things they could envision in their mind, such as building height or a city population. The second group were asked to make guesses about more fuzzy type things such as how many grandchildren did Queen Beatrix have, using a scale of 1 to 10.

While making their estimates, the volunteers were asked to stand on a Wii balance board and to maintain a straight posture as indicated by a crosshair on a computer screen. What they didn’t know was that the posture meter had been rigged so that some were pushed slightly left, others slightly right, with the rest standing straight up and down. For both experiments the groups were split into six groups with the only changes being the order of the questions asked and the induced posture.

After the experiments were concluded, the volunteers were all asked to complete another questionnaire to find out if they actually knew any of the answers or if they were aware that their posture had been altered. As it turned out, none knew any of the answers, which means all the answers given were true estimates, and none caught on to the fact that their posture had been altered.

After studying the results, the research team found that virtually every answer given by those leaning left was smaller than those leaning right or standing straight upright. As an example, those leaning left gave estimates of the height of the that were 12 meters shorter on average than the other two groups.

The study shows, the team reports, that our bodies impact our minds in ways that most of us are completely unaware of and as a result decision-making might be skewed in ways that might surprise us.

Explore further: Which way you lean -- physically -- affects your decision-making

More information: Leaning to the Left Makes the Eiffel Tower Seem Smaller, Psychological Science, Published online before print November 28, 2011, doi: 10.1177/0956797611420731

Abstract
In two experiments, we investigated whether body posture influences people’s estimation of quantities. According to the mental-number-line theory, people mentally represent numbers along a line with smaller numbers on the left and larger numbers on the right. We hypothesized that surreptitiously making people lean to the right or to the left would affect their quantitative estimates. Participants answered estimation questions while standing on a Wii Balance Board. Posture was manipulated within subjects so that participants answered some questions while they leaned slightly to the left, some questions while they leaned slightly to the right, and some questions while they stood upright. Crucially, participants were not aware of this manipulation. Estimates were significantly smaller when participants leaned to the left than when they leaned to the right.

Related Stories

Which way you lean -- physically -- affects your decision-making

November 8, 2011
(Medical Xpress) -- We’re not always aware of how we are making a decision. Unconscious feelings or perceptions may influence us. Another important source of information—even if we’re unaware of it—is ...

Information sharing interferes with 'wisdom of crowds': study

May 17, 2011
(PhysOrg.com) -- A statistical phenomenon, called the Wisdom of Crowds, happens when a group of individuals make guesses and the average of the guesses reveal accurate average answers. However, researchers have discovered ...

Study shows people can guess personality via body odor

December 5, 2011
(Medical Xpress) -- An interesting study conducted by Polish researchers Agnieszka Sorokowska, Piotr Sorokowski and Andrzej Szmajke, of the University of Wroclaw, has found that people are able to guess a person’s type ...

Recommended for you

Gene associated with schizophrenia risk regulates neurodevelopment

September 25, 2017
A gene associated with the risk of schizophrenia regulates critical components of early brain development, according to a new study led by researchers from Penn State University. The gene is involved in the translation of ...

For a better 'I,' there needs to be a supportive 'we'

September 25, 2017
If you're one of those lucky individuals with high motivation and who actively pursues personal growth goals, thank your family and friends who support you.

Babies can learn that hard work pays off

September 21, 2017
If at first you don't succeed, try, try again. A new study from MIT reveals that babies as young as 15 months can learn to follow this advice. The researchers found that babies who watched an adult struggle at two different ...

Study links brain inflammation to suicidal thinking in depression

September 21, 2017
Patients with major depressive disorder (MDD) have increased brain levels of a marker of microglial activation, a sign of inflammation, according to a new study in Biological Psychiatry by researchers at the University of ...

Oxytocin turns up the volume of your social environment

September 20, 2017
Before you shop for the "cuddle" hormone oxytocin to relieve stress and enhance your social life, read this: a new study from the University of California, Davis, suggests that sometimes, blocking the action of oxytocin in ...

Researchers develop new tool to assess individual's level of wisdom

September 20, 2017
Researchers at University of San Diego School of Medicine have developed a new tool called the San Diego Wisdom Scale (SD-WISE) to assess an individual's level of wisdom, based upon a conceptualization of wisdom as a trait ...

8 comments

Adjust slider to filter visible comments by rank

Display comments: newest first

NotAsleep
5 / 5 (4) Dec 14, 2011
"Sorry, Joe, but you were leaning to the left when you made that estimate... you weren't quite right"
MrVibrating
3.7 / 5 (3) Dec 14, 2011
This seems consistent with other studies noting some kind of inherent left-right magnitude scale. It seems we make use of lateralisation (ie. we aquire handedness) to delegate temporal integration windows between hemispheres according to a scalar progression.

Interestingly, some right-to-left languages, such as Farsi, still present numbers from left-to-right - as if numbers are somehow more intuitive that way.

One wonders how handedness differences might affect further results - might they be reversed..?

Similarly, how about cultures that scale numbers from right-to-left (if there are any?)?
Isaacsname
not rated yet Dec 14, 2011
So I wonder if gamblers could get statistical outcomes to lean in their direction ( harhar ) by installing lifts in their shoes to compensate ? Or would casinos start sawing bits off chair legs to beat 'em ?
Guy_Underbridge
not rated yet Dec 14, 2011
LOL, NA
'...and check if your chair's level before you submit that bid proposal!'
gmurphy
5 / 5 (1) Dec 14, 2011
@MrVibrating, what you mean by: 'we make use of lateralisation (ie. we aquire handedness) to delegate temporal integration windows between hemispheres according to a scalar progression.'?
MrVibrating
not rated yet Dec 14, 2011
Sorry that is a little cryptic isn't it? I mean this magnitude scale seems to capitalise on the division of the two hemispheres - itself being a consequence of embryonic development rather than a top-down, 'selected' feature - to optimise parallel processing of different-sized temporal integration windows ('samples' of spatial information) simultaneously... an emergent consequence of efficient division of labour.

Hence why it would be interesting to include lefties, or even schizophrenics and others with neurological differences that might be relevant to bilateral asymmetry..

Point is, this research is no mere 'curious trivia' because it reveals something of the structure of the solution to the binding problem. For instance the question of why certain faculties are lateralised - localised in specific hemispheres - must relate to a systemic principle, that so far remains elusive.. so research such as this is working towards useful answers in cogsci and related fields..
Objectivist
not rated yet Dec 15, 2011
Hence why it would be interesting to include lefties, or even schizophrenics and others with neurological differences that might be relevant to bilateral asymmetry..

Not to mention patients whom have undergone a corpus callosotomy. Though in all fairness almost any test including the latter is bound to be interesting at the very least.
Isaacsname
not rated yet Dec 17, 2011
Hence why it would be interesting to include lefties, or even schizophrenics and others with neurological differences that might be relevant to bilateral asymmetry..

Not to mention patients whom have undergone a corpus callosotomy. Though in all fairness almost any test including the latter is bound to be interesting at the very least.


That is an interesting point....on another note, the wikipage for the surgery said in parenthesis (callosotomy not to be confused with a colostomy ).

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.