Half a Mouse's Hippocampal Synapses Vanish During Artificial Hibernation — So Why Doesn't Its Memory?

Recent research published in the journal Science challenges long-standing theories about how the brain preserves long-term memory. By inducing a hibernation-like state in mice through the stimulation of specific Q neurons, scientists observed that memories remained intact even after more than half of the brain's synapses disappeared. The study reveals that the brain does not lose information randomly; instead, it selectively protects engram synapses that form specific clusters and connect to multiple neurons. This discovery suggests that the spatial arrangement of neural connections is more vital for memory retention than the sheer quantity or size of synapses. These findings offer provocative new insights into neuroplasticity and could eventually influence future treatment strategies for Alzheimer’s disease.