Motion quotient: IQ predicted by ability to filter motion (w/ video)

May 23, 2013
As a person's IQ increases, so too does his or her ability to filter out distracting background motion. This surprisingly strong relationship may help scientists better understand what makes a brain more efficient, and, as a result, more intelligent. Credit: Duje Tadin, University of Rochester

A brief visual task can predict IQ, according to a new study. This surprisingly simple exercise measures the brain's unconscious ability to filter out visual movement. The study shows that individuals whose brains are better at automatically suppressing background motion perform better on standard measures of intelligence.

The test is the first purely sensory assessment to be strongly correlated with IQ and may provide a non-verbal and culturally unbiased tool for scientists seeking to understand associated with general intelligence.

"Because intelligence is such a broad construct, you can't really track it back to one part of the ," says Duje Tadin, a senior author on the study and an assistant professor of brain and cognitive sciences at the University of Rochester. "But since this task is so simple and so closely linked to IQ, it may give us clues about what makes a brain more efficient, and, consequently, more intelligent."

The unexpected link between IQ and motion filtering was reported online in the Cell Press journal Current Biology on May 23 by a research team lead by Tadin and Michael Melnick, a doctoral candidate in brain and cognitive sciences at the University of Rochester.

In the study, individuals watched brief video clips of black and white bars moving across a . Their sole task was to identify which direction the bars drifted: to the right or to the left. The bars were presented in three sizes, with the smallest version restricted to the central circle where human motion perception is known to be optimal, an area roughly the width of the thumb when the hand is extended. Participants also took a standardized .

The video will load shortly
Researchers at the University of Rochester have found that a simple visual task can predict IQ. In the study, individuals watched video clips of black and white bars moving across a computer screen, the same clips you will see in this video. Their sole task was to identify which direction the bars drifted: to the right or to the left. The images were presented in different sizes and the researchers measured how much time participants needed to be able to perceive the direction of the motion. Because the brain filters out background movement, it's actually harder for most people to see movement in the larger images. The study found that people with higher IQs were actually the worst at seeing movement in the large images, or, in other words, the best at filtering out distracting sensory signals. How people performed on this simple task turns out to be a very good predictor of their performance on a standardized intelligence test. Credit: Matt Mann, University of Rochester

As expected, people with higher IQ scores were faster at catching the movement of the bars when observing the smallest image. The results support prior research showing that individuals with higher IQs make simple perceptual judgments swifter and have faster reflexes. "Being 'quick witted' and 'quick on the draw' generally go hand in hand," says Melnick.

But the tables turned when presented with the larger images. The higher a person's IQ, the slower they were at detecting movement. "From previous research, we expected that all participants would be worse at detecting the movement of large images, but high IQ individuals were much, much worse," says Melnick. That counter-intuitive inability to perceive large moving images is a perceptual marker for the brain's ability to suppress background motion, the authors explain. In most scenarios, background movement is less important than small moving objects in the foreground. Think about driving in a car, walking down a hall, or even just moving your eyes across the room. The background is constantly in motion.

The key discovery in this study is how closely this natural filtering ability is linked to IQ. The first experiment found a 64 percent correlation between motion suppression and , a much stronger relationship than other sensory measures to date. For example, research on the relationship between intelligence and color discrimination, sensitivity to pitch, and reaction times have found only a 20 to 40 percent correlation. "In our first experiment, the effect for motion was so strong," recalls Tadin, "that I really thought this was a fluke."

The video will load shortly
People with high IQ scores aren't just more intelligent. They also process sensory information differently, according to a study reported in the Cell Press journal Current Biology on May 23. The findings show that the brains of people with high IQ are automatically more selective when it comes to perceiving objects in motion; they are specifically more likely to suppress larger and less relevant background motion. Credit: Current Biology, Melnick et al.

The video will load shortly
People with high IQ scores aren't just more intelligent. They also process sensory information differently, according to a study reported in the Cell Press journal Current Biology on May 23. Credit: Current Biology, Melnick et al.
So the group tried to disprove the findings from the initial 12-participant study conducted while Tadin was at Vanderbilt University working with co-author Sohee Park, a professor of psychology. They reran the experiment at the University of Rochester on a new cohort of 53 subjects, administering the full IQ test instead of an abbreviated version and the results were even stronger; correlation rose to 71 percent. The authors also tested for other possible explanations for their findings.

For example, did the surprising link to IQ simply reflect a person's willful decision to focus on small moving images? To rule out the effect of attention, the second round of experiments randomly ordered the different image sizes and tested other types of large images that have been shown not to elicit suppression. High IQ individuals continued to be quicker on all tasks, except the ones that isolated motion suppression. The authors concluded that high IQ is associated with automatic filtering of background motion.

Intelligence is closely linked to a person's ability to filter out background movement, according to a new cognitive science study from the University of Rochester. Credit: J. Adam Fenster, University of Rochester

"We know from prior research which parts of the brain are involved in visual suppression of background motion. This new link to intelligence provides a good target for looking at what is different about the neural processing, what's different about the neurochemistry, what's different about the neurotransmitters of people with different IQs," says Tadin.

The relationship between IQ and motion suppression points to the fundamental cognitive processes that underlie intelligence, the authors write. The brain is bombarded by an overwhelming amount of sensory information, and its efficiency is built not only on how quickly our neural networks process these signals, but also on how good they are at suppressing less meaningful information. "Rapid processing is of little utility unless it is restricted to the most relevant information," the authors conclude.

The researchers point out that this vision test could remove some of the limitations associated with standard IQ tests, which have been criticized for cultural bias. "Because the test is simple and non-verbal, it will also help researchers better understand neural processing in individuals with intellectual and developmental disabilities," says co-author Loisa Bennetto, an associate professor of psychology at the University of Rochester.

Explore further: Enhanced motion perception in autism may point to an underlying cause of the disorder

More information: Current Biology, Melnick et al.: "A strong interactive link between sensory discriminations and intelligence." dx.doi.org/10.1016/j.cub.2013.04.053

Related Stories

Enhanced motion perception in autism may point to an underlying cause of the disorder

May 8, 2013
Children with autism see simple movement twice as quickly as other children their age, and this hypersensitivity to motion may provide clues to a fundamental cause of the developmental disorder, according to a new study.

Genetic risk for schizophrenia is connected to reduced IQ

May 16, 2013
The relationship between the heritable risk for schizophrenia and low intelligence (IQ) has not been clear. Schizophrenia is commonly associated with cognitive impairments that may cause functional disability. There are clues ...

Debunking the IQ myth

May 7, 2013
(Medical Xpress)—You may be more than a single number, according to a team of Western-led researchers. Considered a standard gauge of intelligence, an intelligence quotient (IQ) score doesn't actually provide an accurate ...

Researchers suggest Victorian-era people more intelligent than modern-day counterparts

May 17, 2013
(Phys.org) —In a new study, a European research team suggests that the average intelligence level of Victorian-era people was higher than that of modern-day people. They base their controversial assertion on reaction times ...

Schizophrenia genes increase chance of IQ loss

February 21, 2013
People who are at greater genetic risk of schizophrenia are more likely to see a fall in IQ as they age, even if they do not develop the condition.

New genetic evidence suggests continuum among neurodevelopmental and psychiatric disorders

April 5, 2013
A paper published this month in the prestigious medical journal The Lancet Neurology suggests that a broad spectrum of developmental and psychiatric disorders, ranging from autism and intellectual disability to schizophrenia, ...

Recommended for you

Visual clues we use during walking and when we use them

July 25, 2017
(Medical Xpress)—A trio of researchers with the University of Texas and Rensselaer Polytechnic Institute has discovered which phase of visual information processing during human walking is used most to guide the feet accurately. ...

Psychopaths are better at learning to lie, say researchers

July 25, 2017
Individuals with high levels of psychopathic traits are better at learning to lie than individuals who show few psychopathic traits, according to a study published in the open access journal Translational Psychiatry. The ...

Toddlers begin learning rules of reading, writing at very early age, study finds

July 25, 2017
Even the proudest of parents may struggle to find some semblance of meaning behind the seemingly random mish-mash of letters that often emerge from a toddler's first scribbled and scrawled attempts at putting words on paper.

Higher cognitive abilities linked to greater risk of stereotyping

July 24, 2017
People with higher cognitive abilities are more likely to learn and apply social stereotypes, finds a new study. The results, stemming from a series of experiments, show that those with higher cognitive abilities also more ...

Exposure to violence hinders short-term memory, cognitive control

July 24, 2017
Being exposed to and actively remembering violent episodes—even those that happened up to a decade before—hinders short-term memory and cognitive control, according to a study published in the Proceedings of the National ...

Researchers pave new path toward preventing obesity

July 24, 2017
People who experience unpredictable childhoods due to issues such as divorce, crime or frequent moves face a higher risk of becoming obese as adults, according to a new study by a Florida State University researcher.

3 comments

Adjust slider to filter visible comments by rank

Display comments: newest first

StarGazer2011
1 / 5 (1) May 24, 2013
the large object effect is really suprising
gwrede
3 / 5 (2) May 24, 2013
I expect a bunch of "no, no, no, Intelligence is so many differen things", etc.
ODesign
4 / 5 (1) May 27, 2013
I wonder if there's a difference in the eye saccade movements related to IQ also? In User Interface design we sometimes have people look at web pages while eye tracking (gaze following) software maps what they focus on to the screen. Does the Gaze Following behavior also bear an IQ signature or is it affected in a measurable way by IQ?

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.