A Hidden Movement Map Discovered In The Brain’s Insula

Mayo Clinic researchers person identified a hidden "movement map" heavy wrong nan encephalon - a find that could thief surgeons trim broadside effects from epilepsy procedures and guideline early treatments for reside and activity disorders.

In a study published Feb. 18 successful the Proceedings of nan National Academy of Sciences, nan squad reports that a small, buried encephalon region called nan insula contains its ain organized representation of nan body. Distinct areas wrong nan insula are linked to activity of nan hands, feet, and tongue.

The uncovering has contiguous relevance for epilepsy care. Surgeons sometimes run successful aliases adjacent nan insula to dainty seizures, and up to 30% of patients tin acquisition impermanent problems pinch speech, swallowing aliases manus activity afterward. Until now, doctors did not person elaborate maps showing precisely wherever those functions are located successful this heavy encephalon region.

If we tin place wherever manus and reside functions unrecorded successful each patient, we tin amended expect - and perchance debar - those deficits. This gives america a applicable roadmap."

Panos Kerezoudis, M.D., a Mayo Clinic neurosurgery resident and lead writer of nan study

The insula sits respective centimeters beneath nan brain's surface, hidden nether different lobes, which has made it difficult to study pinch accepted techniques.

"For a agelong time, group thought this region was mostly progressive during galore tasks - much of an integrator than a system map," says Dr. Kerezoudis. "We wanted to cognize whether it follows nan aforesaid organized layout we spot successful nan main centrifugal cortex, aliases if it responds nan aforesaid measurement nary matter what you move."

To reply that question, researchers successful nan Cybernetics and Motor Physiology Lab astatine Mayo studied 18 patients pinch medically refractory epilepsy who had bladed signaling electrodes placed heavy successful their brains arsenic portion of their objective care.

While hospitalized, patients performed elemental movements specified arsenic opening and closing their hand, moving their tongue, aliases flexing their foot. The electrodes recorded electrical activity successful some nan insula and nan superior centrifugal cortex, nan brain's main activity center, pinch millisecond precision.

The results showed clear organization: manus movements activated 1 area of nan insula, lingua movements different and ft movements yet another, though little prominently.

"We recovered chopped body-part practice successful this heavy structure," says Dr. Kerezoudis. "It is not random. There is order."

The timing of activity was besides revealing. The superior centrifugal cortex became progressive first, followed by nan insula, and past activity occurred.

"This shows that nan insula is not simply reacting aft we move," says Kai Miller, M.D., Ph.D., a Mayo Clinic neurosurgeon and elder writer of nan study. "This find expands our knowing of really activity is supported by a distributed encephalon web whose parts are much tightly integrated than we antecedently thought. By mapping it carefully, we tin make encephalon room and neuromodulation safer, much precise, and beneficial for much people."

In a subset of patients, researchers delivered brief, safe electrical pulses to trial really nan regions communicate. Stimulating a hand-related area successful nan centrifugal cortex triggered a consequence successful nan matching area of nan insula, and nan aforesaid shape held for lingua regions.

"The connections respect nan assemblage representation - manus connects to hand, lingua to tongue," says Dr. Kerezoudis. "That strengthens nan lawsuit that this is an organized network."

Clinically, nan findings could thief neurologists amended construe seizure symptoms, specified arsenic manus contractions aliases facial movements, and refine electrode placement during epilepsy evaluations. Surgeons whitethorn besides usage individualized maps to scheme procedures much precisely.

Beyond epilepsy, nan activity whitethorn pass early therapies for changeable survivors pinch reside aliases manus activity difficulties. If activity relies connected a web that includes some nan superior centrifugal cortex and nan insula, treatments specified arsenic targeted encephalon stimulation whitethorn request to reside some areas.

The study supports Mayo Clinic's Bioelectronic Neuromodulation Innovation to Cure (BIONIC) inaugural by utilizing precocious brain-recording exertion to construe technological discoveries into applicable attraction strategies. It besides aligns pinch Pre-cure, which focuses connected anticipating and preventing complications earlier they hap - specified arsenic identifying captious activity areas earlier room alternatively than reacting to deficits afterward.