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Single-celled organism learns and remembers without brain or neurons
Prof. Wallace Marshall's team at the University of California in San Francisco has shown that Stentor coeruleus — a single-celled freshwater organism about a millimeter long — can permanently ignore repeated harmless stimuli, learning through biochemical pathways known from the human nervous system. The discovery challenges the belief that learning and memory require elaborate neural networks and specialized synapses. It is a breakthrough result suggesting that the foundations of memory existed in evolution long before the brain appeared.
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