In this episode I’m continuing to look at consciousness and cognition and the working memory that sets humans apart from all other animals. Human working memory can be roughly quantified to hold about 7 items at once in a sequence and allow conscious manipulation, consideration, and attention to about 4 of them at a time. These numbers are surprisingly consistent across all humans. The size of working memory in humans is much larger than in our nearest relatives the great apes. The ability to remember sequence information also seems to be unique.

Today I’m interviewing a researcher who studies the evolution of the human capacity for cognition. His vocabulary and working memory are both immense.  I need to stretch my working memory to the limit just to parse some of his most elegant utterances.  For example, in a recent exchange he opined the following gem: “However, as Karl Friston reminded us, the mathematical itinerancy of stochastic genetical and epigenetical mechanisms in ergodic systems can explain the appearances, disappearances, and reappearances of some technological outcomes of Early Pleistocene human behaviours from a far more rational scientific basis than can any self-justifying assertion that ‘absence of evidence is not evidence of absence’.”

Professor emeritus Michael Walker is a paleoanthropologist with degrees in Medicine, Physiology, and Prehistoric Archaeology from Oxford University including his doctorate on the prehistoric physical anthropology and archaeology of the southeastern Spanish region of Murcia. He established systematic two important Palaeolithic excavation sites, one with fossil remains of fourteen Neanderthals in deep sediments with dates from 130,000 to 40,000 years ago, and a very much older site dating to between 900,000 and 772,000 years ago where he discovered burning in the cave, as well as abundant stone artefcts among which is the earliest stone hand-axe from Europe. The unique hand-axe reawakened Dr. Walker’s interest in neuroscience and, in particular, about how cognition might lead to surprising manual behaviour that was not passed on culturally. This hypothesis, based on the Free Energy Principle, has implications on the evolution of human cognition and calls into question time-honoured interpretations by anthropologists about human cultural transmission.

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