Multitasking with media devices linked to brain changes

Date: Sep-26-2014An increasing feature of modern life is the miscellany of cellphones, laptops, tablets and

other media devices that connect us to information and each other. Excessive media-multitasking has

already been linked with cognitive, social and emotional problems. Now a brain scan study shows for

the first time that media-multitasking is linked to brain structure differences.

Compared with people who occasionally use only one media device, those who often use several media devices at the same time have lower gray-matter density in a brain region involved in cognitive and emotional control.

The research, conducted in the Sackler Centre for Consciousness Science at the University of

Sussex in the UK, is published in the journal PLOS ONE.

Neuroscientists Kep Kee Loh and Dr. Ryota Kanai found that compared with people who occasionally

use only one media device, those who often use several media devices at the same time have lower

gray-matter density in the anterior cingulate cortex - a brain region involved in cognitive and

emotional control.

For their study they looked at functional magnetic resonance imaging (fMRI) brain scans of 75

adults who had completed a survey about their use of media devices such as cellphones, computers,

television and print media.

The participants had also completed assessments of what psychologists call the "Big 5"

personality traits: extraversion, agreeableness, openness, conscientiousness and neuroticism.

Higher media-multitasking associated with smaller gray matter volumes

When they compared the fMRI data with the media-multitasking data, the researchers found higher

media-multitasking was associated with smaller gray matter volumes in the anterior cingulate

cortex.

However, they also found a correlation between media-multitasking and extraversion in the Big 5

scores, leading them to wonder if this might be confounding the link between media-multitasking and

gray matter volume.

But when they ran another analysis called a multiple regression that took into account the Big 5

as possible predictors of high media-multitasking, the results were the same. There appears to be a

"unique association" between media-multitasking and gray-matter density in the anterior cingulate

cortex that is independent of personality, conclude the authors.

The study confirms evidence from previous research that links high levels of media-multitasking

with depression, anxiety and poor attention when faced with distractions.

Study found link - not cause and effect

However, the authors are keen to point out all they have established is a link - it would take

another type of study to find out if media-multitasking causes changes in the brain or whether

people with less dense gray matter are attracted to media-multitasking.

Scientists have shown brain structure can change with experience and under different conditions.

Brain cells and pathways respond to changes in behaviors, emotions and environments, and "cortical

re-mapping" can re-route brain functions to intact regions when damage occurs.

There are also studies that show training can increase gray-matter density. For example learning

to juggle, or when taxi drivers learn the map of London in the UK. For

trainee London cabbies to acquire what is termed "The Knowledge," they have to learn and locate

25,000 streets and 20,000 landmarks, as well as their intricate layout.

Written by Catharine Paddock PhD

View all articles written by Catharine

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Courtesy: Medical News Today Note: Any medical information available in this news section is not intended as a substitute for informed medical advice and you should not take any action before consulting with a health care professional.