L 440: The story so far is a telling of the familiar pre Cambrian time (Ediacaran) with some details and animals that are new to me. The focus is on the rôle the nervous system. As the Cambrian explosion exploded the arms race began with the considerable help of the nervous system.
L 462: Cubozoa: Jelly(fish) with eyes and no brains. Bizarre! N.B. there is no implication that our common ancestor had eyes.
L 460: “From this point [Cambrian] on, the mind evolved in response to other minds.” The books emphasis on information begins to pay off.
L 477: This sections describes well the purpose of a model. What is truth? Has that changed since we modeled in order to predate, or escape predators?
L 877: This section is sort of “What it like to be an octopus”.
L 991: William James said that consciousness did not irrupt in evolution. Good point. I suggest that the semi conscious state that human’s go thru as they waken is a decent approximation of partly conscious, except for the dying dreams sometimes experienced.
L 1143: Milner & Goodale’s dorsal stream of visual information is the same as blind sight as described by Ramachandran.
L 1588: Regarding photoreceptors in the skin of cuttlefish and octopuses: The chromatophores in the skin may act as filters for the monochrome photoreceptors there. This provides sensing different colors and would indeed motivate changing colors in various patterns. This in turn suggests how these animals know how to camouflage themselves.
The author goes immediately on to this explanation. Where most people are trichromats, the octopus is a unichromat. Its eyes see black and white.
L 1671: “Any color changes that do not contribute to signaling and camouflage are side effects, from an evolutionary point of view.” I claim they are just looking at ambient colors which means that those monochrome photoreceptors do inform the brain.
I had always wondered how the fish that camouflaged themselves figured out what they were supposed to look like.
L 1839: The author may be leading up to the idea that speech evolved originally as a means of organizing complex thought. That form would have no phonetics associated with it. Julian Jaynes thought that humans have a ‘tape recorder’ with which we remember plans for the hunt. That recorder was definitely phonetic in nature and malfunctions of that recorder result in hearing voices today.
L 1868: I think there are at least two sorts of thinking. The old stuff was primarily retrieving situations from memory in response to recognized patterns; then filling in the parameters. The second is linear combinatorial thinking. I.e. Kahneman. In between is nested goals which allowed the monkeys the figure out how to stack boxes.
L 2142: Why do we age? Telomeres are the mechanism but then how does the next generation get long telomeres that the single organism cannot use. There seems to be a planned obsolescence.
There is considerable discussion on the role of the nervous system and its evolution.
The speculations on the relationship between language and thinking are very interesting.
The author quotes many ideas about consciousness that I had not heard. They are interesting but do not dislodge my ideas. They are fairly compatible.