Erik Hoel's The World Behind the World and the Intellect Facet (O5)
Erik Hoel is a neuroscientist and novelist who writes the Substack The Intrinsic Perspective, and The World Behind the World is his attempt to explain why science has such trouble with consciousness. His starting point is that we carry two ways of seeing the mind. One is the outside view, the brain as machinery and mechanism, which is how a scanner or an equation treats it. The other is the inside view, the mind as it feels from within. In an EconTalk interview he draws the line simply: "When we talk about minds, we're using the intrinsic perspective." A book like that finds a particular kind of reader, and in the Big Five that reader scores high on one facet.
The appetite for the question is the Intellect facet
That facet is Intellect (O5), under Openness, the pull toward abstract ideas and problems that do not resolve into a tidy answer. A high scorer enjoys turning a question like why anything feels like anything over for its own sake, without needing it to pay off. A low scorer reads the same question and reasonably asks what the point is. Hoel's book is written for the high end. It spends its length on free will, on the limits of what measurement can reach, and on why the inside view keeps slipping through the net that physics casts, and it assumes you find that chase worth taking.
The interesting part is what Intellect does not track. A high score says little about how smart or well read you are. It tracks appetite, how far you will chase a question that has no payoff at the end. Plenty of sharp people have low O5 and prefer questions with edges and answers, and plenty of people who never finished a science degree will happily stay up arguing about whether a machine could be conscious. Hoel's own path, a working neuroscientist who also writes fiction, tracks the way high Openness tends to spill across the border into Imagination (O1), where the same mind that wants the hard question also wants to build worlds that answer it in story.
For a reader mapping this onto themselves, the useful read is that a strong appetite for The World Behind the World is a signal, not only a taste in books. High O5 shapes the work people are drawn to, the conversations that hold them, and the ideas they will chase past the point of usefulness. It predicts less about your income than about which problems you will volunteer for. If the book grabs you, the score behind that grab is worth knowing, and we go further into the facet in Intellect (O5).
Read the book: The World Behind the World: Consciousness, Free Will, and the Limits of Science by Erik Hoel.
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Research Citations
Hoel, E. (2023). The world behind the world: Consciousness, free will, and the limits of science. Avid Reader Press.
DeYoung, C. G., Quilty, L. C., & Peterson, J. B. (2007). Between facets and domains: 10 aspects of the Big Five. Journal of Personality and Social Psychology, 93(5), 880-896.
Johnson, J. A. (2014). Measuring thirty facets of the Five Factor Model with a 120-item public domain inventory: Development of the IPIP-NEO-120. Journal of Research in Personality, 51, 78-89.
Costa, P. T., & McCrae, R. R. (1992). Revised NEO Personality Inventory (NEO-PI-R) professional manual. Psychological Assessment Resources.