Issue 35.4 FALL 2026 |
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and memory loss— changes |
trajectory. Seizure activity |
Brain rewiring holds the answer |
Age-specific treatments may |
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relevant to brain injury-induced dementia.
“ People may assume younger brains are more resilient after injury, but our findings suggest the story is much more nuanced,” said Dr. Samba Reddy, Regents Professor and Distinguished Professor of neuroscience and experimental therapeutics at the Texas A & M Naresh K. Vashisht College of Medicine and senior author of the study.“ The same plasticity that helps younger brains adapt may also create conditions that support the development of seizure-producing networks.”
Post-traumatic epilepsy follows different paths in younger and older brains Despite decades of research, scientists still do not fully understand why some injured brains develop epilepsy, memory problems or other lasting neurological complications while others do not.
To better understand the role of age, the research team monitored brain activity continuously for four months following traumatic injury, tracking changes in neurological function, cognition and brain structure. The results revealed two very different patterns.
“ Older brains that developed seizure activity tended to do so earlier after injury, but the seizure activity stabilized and remained relatively limited,” said Reddy, who directs the Texas A & M Institute of Pharmacology and Neurotherapeutics.“ Younger
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emerged later but increased steadily over time, resulting in a significantly greater overall seizure burden during the longterm phase of recovery.”
Younger brains also showed higher levels of electrical activity associated with the development of epilepsy, Reddy said.
Better recovery in some areas, worse outcomes in others The study found that age did not simply make outcomes better or worse; instead, it appeared to shift where vulnerabilities emerged after injury.
Older brains showed quicker improvements in motor function and coordination following traumatic injury. Younger brains, by contrast, continued to exhibit deficits in balance and coordination long after the initial trauma.
Yet the opposite pattern emerged when memory was tested.
Older brains displayed greater difficulties with long-term memory retention, even when learning appeared relatively intact. Younger brains also experienced cognitive deficits, but the decline in memory performance was more pronounced in older subjects.
“ Aging changed the path of recovery rather than simply making recovery more difficult,” Reddy said.“ Older brains appeared less susceptible to chronic seizure activity, but they remained vulnerable in other ways, particularly when it came to memory and cognitive
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for dementia
To understand why age influenced
the brain’ s response to
injury so differently, researchers
examined changes in the hippocampus
, a region involved
in both memory and seizure
generation.
Surprisingly, the two age groups
showed comparable levels of
neuron loss after injury. That
finding suggests that cell death
alone can’ t explain the stark
differences seen after injury.
Instead, the differences appeared
to be linked to how the brain
reorganized itself after trauma.
“ We found that younger brains
showed greater levels of electrical
hyperactivity associated
with epilepsy, while older brains
demonstrated stronger signs of
abnormal circuit reorganization
and persistent inflammatory
responses in specific regions of
the brain,” Reddy said.
Taken together, the findings
suggest that the long-term consequences
of TBI are shaped
less by the amount of damage
sustained and more by how the
brain responds to that damage
over time.
In addition to revealing more about post-traumatic epilepsy, Reddy said the research provides insights on the development of dementia and related memory issues in aging brains. The study identifies persistent inflammation, circuit reorganization and memory deficits as warning signs that deserve closer scrutiny as possible links between brain trauma and later neurodegener-
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matter TBIs affect millions of people each year. Their serious consequences may emerge long after the injury appears to have healed, such as seizures, memory loss or dementia-like decline. Yet many efforts to prevent long-term complications have largely treated patients as though they follow the same recovery process. The new findings suggest that assumption may overlook critical biological
differences.
“ A younger brain may require interventions aimed at preventing the gradual development of seizure-producing networks,” Reddy said,“ while older brains may benefit from approaches that address memory loss, inflammation and cognitive decline
following injury.”
He said the results reinforce the idea that age is not just a demographic characteristic but an important biological factor that influences how the brain heals after injury.“ Understanding those differences could help us develop more targeted strategies to reduce seizures, preserve cognitive function and improve long-term outcomes for patients.” g
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brains followed a delayed |
function.” |
ation, Reddy said. |
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