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Slime mold has been a subject of discussion on the podcast since Season 1. Senior contributing editor Prego de Nada originally used slime mold, aka physarum, as an example of spontaneous emergent order in nature, with the purpose of demonstrating that what looks like design can, and frequently does occur without any designer. Prego then penned an essay in Season 5 to talk about the results of ongoing research.
The world-shaking conclusion of the investigation, the evidence that sent everyone back to square one, is that physarum exhibits cognition without a brain that is capable of symbolic representation. Cognitive scientists until recently believed that symbolic representation was a necessary ingredient to the mix.
Jellyfish are likewise interesting to cognitive scientists, because they also exhibit cognition, and also do not possess any structure that functions as a brain, although jellyfish do have a neuronal net and are multicellular organisms that accomplish cognition in a somewhat different manner from slime mold.
The episode concludes with a discussion of the relationship between cognition and consciousness, what consciousness might be in a fundamental sense, and the fascinating ongoing debate among cognitive scientists, as new evidence continuously comes to light.