Marshall Devor
Department of Cell and Developmental Biology, Institute of Life Sciences, The Hebrew University of Jerusalem
Biological naturalist Consciousness requires living metabolic hardware
Marshall Devor is Professor Emeritus in the Department of Cell and Developmental Biology and the Center for Research on Pain at the Hebrew University of Jerusalem. His experimental work spans peripheral and central mechanisms of neuropathic pain, ectopic pacemakers in injured sensory ganglia, and the subcortical circuitry governing general anesthesia and loss of consciousness.
In the 2026 hypothesis paper Brainstem theory of consciousness (The Neuroscientist, doi:10.1177/10738584261470362), co-authored with Mark Baron, Devor argues that raw phenomenal awareness originates in the upper brainstem rather than the cerebral cortex. Building on his laboratory’s identification of the mesopontine tegmental anesthesia area (MPTA), where microinjections of GABAergic anesthetics in rodents trigger rapid loss of consciousness and targeted lesions alter anesthetic sensitivity, Devor and Baron propose that the cortex acts as an information-processing organ that supplies high-dimensional content to a pre-existing subcortical sentience generator.
Devor’s physiological evidence centers on the dissociation between cortical stimulation and raw pain. While direct electrical stimulation of the human cerebral cortex evokes visual phosphenes, auditory tones, and somatosensory paresthesias, it almost never evokes raw pain, whereas subcortical pathways and brainstem nuclei sustain nociceptive affect even when cortical tissue is absent or damaged. Within consciousness research, his framework provides an empirical brainstem anchor alongside the subcortical theories of Bjørn Merker, Jaak Panksepp, and Mark Solms.
Known for. Brainstem Theory of Consciousness, Mesopontine Tegmental Anesthesia Area (MPTA), neuropathic pain electrophysiology
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Marshall Devor is listed with the other biological naturalists, who hold that consciousness requires living metabolic hardware. The theory family behind that position is set out in the index of consciousness theories. Every researcher covered on this site is indexed in the directory of consciousness researchers.