A new study from the National Eye Institute reveals that during deep hibernation, specific neurons in the visual cortex of squirrels undergo rapid structural changes that completely reverse within 1.5 hours of waking — with zero long-term effects. This remarkable, high-speed plasticity could one day help stroke patients regain lost function.
The Research
Led by Dr. Hendrikje Nienborg, the research team examined how two types of neurons in the visual cortex of squirrels responded during different stages of hibernation. They found that one population altered their structure during deep torpor, while another remained unchanged. Crucially, within 90 minutes of arousal, these changes fully reversed. Follow-up assessments six months later showed no differences between hibernating and non-hibernating squirrels, indicating the brain completely resets after each hibernation cycle.
This study, published in the Journal of Neuroscience, was the first to map structural plasticity in the visual cortex during hibernation. Prior work had only looked at touch-processing regions. The findings suggest that hibernation triggers a targeted, reversible pruning of neural connections — a defense mechanism to conserve energy without permanent damage.
Why It Matters
For humans, stroke often causes permanent brain damage because adult neurons are not naturally adaptable. But if we can understand how squirrels safely and quickly reorganize their neurons, we might unlock similar plasticity in human brains. "If we can figure out how to leverage this mechanism, we can potentially help human adult brains be more adaptable, especially during recovery after stroke," Dr. Nienborg said.
This research provides a blueprint for developing therapies that could accelerate neural repair after injury, without causing long-term deficits. The key is learning how to safely trigger this type of rapid, reversible change in humans.
What You Can Do
While we can't induce hibernation, we can support brain plasticity through lifestyle. Regular aerobic exercise, learning new skills (like a language or instrument), and prioritizing sleep all promote neuroplasticity. Even short bursts of novel stimulation can help keep your brain flexible. Curious about your own cognitive adaptability? A free intelligence test can give you a baseline, and brain training exercises can help maintain mental agility.
Source: Neuroscience News
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