➽=ALL This Brainless, Single-Celled Blob Can Make Complex 'Decisions' Tiny, brainless blobs might be able to make decisions: A single-celled organism can "change its mind" to avoid going near an irritating substance, according to new findings.
Over a century ago, American zoologist Herbert Spencer Jennings conducted an experiment on a relatively large, trumpet-shaped, single-celled organism called Stentor roeselii. When Jennings released an irritating carmine powder around the organisms, he observed that they responded in a predictable pattern, he wrote in his findings, which he published in a text called "Behavior of the Lower Organisms" in 1906. https://www.livescience.com/single-celled-organisms-decisions.html