A controversial idea from the mid-20th century is attracting renewed attention from researchers developing theories for how cognition arises with or without a brain.
Psychologist Beatrice Gelber conducted experiments in the 1950s & 1960s to test for associative learning in Paramecium aurelia.
Scientists are re-evaluating evidence for unicellular learning.
https://www.the-scientist.com/features/can-single-cells-learn-68694
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