Peter Godfrey Smith covers some of this in his book Metazoa but he rejects pan-psychicism and tries to make us believe that pure materialism can explain conscio

Peter Godfrey Smith covers some of this in his book Metazoa but he rejects pan-psychicism and tries to make us believe that pure materialism can explain consciousness, as it emerged in animals over the last 750 million years, going back to an unknown ur-brain that might have existed in the first bilaterian: https://www.amazon.com/Metazoa-Animal-Minds-Birth-Consciousness/dp/000832123X/ref=mp_s_a_1_1?crid=DZXB9BP7VXU8&keywords=metazoa&qid=1657068807&sprefix=metazoa%2Caps%2C99&sr=8-1 https://www.amazon.com/Metazoa-Animal-Minds-Birth-Consciousn... However, I was not convinced by the material argument, which seems just as magical as any other explanation, as there comes a moment when we have to believe “then something magic happens and the creatures suddenly have real awareness of their surroundings.” Having read the book, which denounced pan-psychism, I actually found myself more favorably inclined to pan-psychism , since it clearly is no more magical then any other explanation.