Mental Foraging and the Evolution of Memory: an updated model of clinical hypnosis

The mind did not evolve to think. It evolved to forage.

Knowing this, what if hypnosis isn't something strange or rare—but something your brain already knows how to do?

In Mental Foraging and the Evolution of Memory, clinical hypnotist James M. Harrison argues that long before hypnosis was an idea about the workings of the unconscious mind, nervous systems had already evolved the ability to mentally forage. Pausing to simulate, rehearse, and test possibilities before acting, this capacity became foundational to human imagination, memory, and adaptive behavior. Drawing from modern neuroscience, psychology, and the history of medicine, the book shows how clinical hypnosis works directly with this evolved ability—standing apart from metaphysical or "altered state" explanations, and offering instead a biologically grounded method for guiding attention, perception, and behavior change. Blending accessible science with creative narrative, Harrison presents a new framework for understanding healing and learning—one that locates the roots of healing not in trance, suggestion, or altered states—but in something far older: a nervous system that learned, long ago, to forage through its own past before stepping into its next moment.

James M. Harrison is a Portland-based clinical hypnotist whose work integrates neuroscience research, evolutionary cognition, and clinical practice. He is Northwest Area Steward for the ManKind Project. His mission is to aid in a world where healing is natural and abundant. Harrison spent his first career building large-scale public and private sculpture commissions. At fifty, he stepped away from that work to pursue something more personal: helping people heal. He became a certified clinical hypnotist in 2017 and spent six years as a Life Enrichment Coordinator on a medical team in elder dementia care-an experience that deepened his inquiry into the nature of memory and its role in human experience. A pointed question from his medical director-what is the current science behind hypnosis?-set him on the path to produce his first book, Mental Foraging and the Evolution of Memory. He is also a cat person who is learning guitar with unreasonable optimism. You can find him at www.jamesmharrison.com and www.mentalforaging.com.