Studying the brain's suspension system in traumatic brain injuries

April 4, 2017 by Erika Ebsworth-Goold
Engineers at Washington University in St. Louis are taking a closer look at the brain's 'suspension system' to test just how effective it is in helping protect against traumatic brain injury, or TBI. The top row of images shows displacement of brain tissue as observed in the new research; the bottom row shows 'curl,' or change in shape. Credit: Washington University in St. Louis

Traumatic brain injury, or TBI, can be devastating and debilitating. Despite intense interest and years of study, the exact mechanisms linking force and neurological injury remain unclear. Researchers know that the membranes separating the skull from the brain play a key role in absorbing shock and preventing damage caused during a head impact, but the details remain largely mysterious.

New research from a team of engineers at Washington University in St. Louis takes a closer look at this "suspension system" and the insight it could provide to limit or perhaps prevent TBI.

"The idea was to find out how protective are the layers of membranes that connect the brain to the ," said Philip Bayly, the Lilyan & E. Lisle Hughes Professor of Mechanical Engineering and chair of the Mechanical Engineering & Materials Science Department at the School of Engineering & Applied Science. "They serve the same function as the suspension in your car. When you go over a bump in a car, there's a big oscillation of the wheels but you get very little motion in your body because the suspension absorbs it.

"We know that the membranes are there to cushion the brain, but by how much, and what's the variation from person to person?"

During the study, researchers used an imaging technique called magnetic resonance elastography, or MRE, on six volunteers. During MRE, tiny skull vibrations are introduced through a vibrating pillow and measured with sensors embedded in a mouthguard. The motion of the brain was then measured via imaging. When compared to a gelatin model that showed significant force transfer, the six subjects' skull-brain interface significantly delayed and weakened the transfer of motion from skull to brain.

The video will load shortly

"We're putting numbers to it, quantifying how much protection is actually there," Bayly said. "During our study, 90 percent of the motion to the was attenuated."

The next steps: eliminating the need for the mouthguard-sensor system and developing a more streamlined MRE method, which could enable a larger study with many more subjects.

"This would allow us to examine factors such as age or gender as variables when it comes to , and see who might be more susceptible to such injuries," Bayly said.

The research was recently accepted by the Journal of Biomechanical Engineering, and is now available online.

Explore further: Engineer helping unravel mystery of traumatic brain injury

More information: Andrew A. Badachhape et al, The Relationship of Three-Dimensional Human Skull Motion to Brain Tissue Deformation in Magnetic Resonance Elastography Studies, Journal of Biomechanical Engineering (2017). DOI: 10.1115/1.4036146

Related Stories

Recommended for you

People match confidence levels to make decisions in groups

May 26, 2017

When trying to make a decision with another person, people tend to match their confidence levels, which can backfire if one person has more expertise than the other, finds a new study led by UCL and University of Oxford researchers.

Optic probes shed light on binge-eating

May 26, 2017

Activating neurons in an area of the brain not previously associated with feeding can produce binge-eating behavior in mice, a new Yale study finds.

Study finds gray matter density increases during adolescence

May 26, 2017

For years, the common narrative in human developmental neuroimaging has been that gray matter in the brain - the tissue found in regions of the brain responsible for muscle control, sensory perception such as seeing and hearing, ...

Game study not playing around with PTSD relief

May 26, 2017

Post-traumatic stress disorder (PTSD) patients wrestling with one of its main symptoms may find long-term relief beyond medication thanks to the work of a Western researcher.

Fathers' brains respond differently to daughters than sons

May 25, 2017

Fathers with toddler daughters are more attentive and responsive to those daughters' needs than fathers with toddler sons are to the needs of those sons, according to brain scans and recordings of the parents' daily interactions ...

Scientists demonstrate the existence of 'social neurons'

May 25, 2017

The existence of new "social" neurons has just been demonstrated by scientists from the Institut de neurosciences des systèmes (Aix-Marseille University / INSERM), the Laboratoire de psychologie sociale et cognitive (Université ...

0 comments

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.