A proposal that moves consciousness deeper into the brain
Why does a person remain present to themselves even when the outside world is temporarily shut out? A new hypothesis paper argues that the answer may begin not in the cerebral cortex, the brain’s familiar folded outer layer, but in far older circuitry in the brainstem.
The proposal, published in The Neuroscientist, was developed by Marshall Devor of the Hebrew University of Jerusalem and Mark Baron of the Hebrew University and Harvard Medical School. It does not claim to have solved consciousness. Instead, it assembles experimental findings and clinical observations into a case for a different division of labor inside the brain: the brainstem may provide the basic capacity to have subjective experience, while the cortex shapes much of the detailed content of experience.
That framing runs against theories that place the primary origin of consciousness in the cortex, which is closely associated with language, recognition, planning and many complex sensory functions. The authors’ central claim is narrower but consequential. They suggest that a more primitive neural system could be responsible for the elemental feeling that an experience is being felt at all.
Why pain is central to the argument
Pain is the paper’s key example because it separates detection from subjective experience. The nervous system can respond to a dangerous stimulus with a rapid protective movement. That reflex does not necessarily answer the more difficult question: where does the felt unpleasantness of pain arise?
Devor and Baron point to evidence from brain stimulation, epileptic seizures, neurological injury and related research. In their interpretation, this evidence suggests that pain experience does not depend on the cortex in the same way as rich visual and auditory perception. Extensive cortical damage can severely impair vision or hearing while leaving pain experience intact, and in some cases heightened. By contrast, damage to particular brainstem regions is consistently associated with coma.
The distinction matters because it challenges the idea that the brainstem merely keeps the cortex switched on. If the authors are right, it may instead contribute directly to the existence of subjective feeling. In that account, the cortex would still be indispensable for many of the sophisticated things human minds do, but it would not be the sole source of being conscious.
A hypothesis, not a settled mechanism
The researchers explicitly present their work as a theory built from existing observations, not as proof of a complete biological mechanism. Consciousness remains one of neuroscience’s most difficult open questions, and competing accounts assign different roles to cortical networks, thalamic systems and deeper structures.
The paper’s value lies in putting clinical and experimental evidence into a testable challenge for cortex-centered models. It asks researchers to distinguish more carefully between the neural systems that enable complex perception and cognition and those that may support the basic capacity for experience.
That distinction could also influence how scientists interpret severe brain injuries. If consciousness depends partly on specific brainstem circuitry, assessments of damage to those structures may carry special importance when clinicians are evaluating coma and other disorders of consciousness. The supplied report does not establish a new diagnostic method, but it highlights why the precise location of injury can matter.
What the debate changes
At stake is not simply an anatomical disagreement. A brainstem-centered account would alter the starting point for studies of consciousness. Rather than asking only how the cortex combines sensory information into a coherent scene, researchers would also need to ask how lower brain systems create the basic condition in which sensations can be subjectively experienced.
The proposal also leaves room for the cortex’s well-established importance. Complex perception, language and planning remain deeply tied to cortical function. The argument is that these capacities may elaborate conscious life rather than create its most fundamental spark.
For now, the paper is best read as a focused intervention in a long-running scientific debate. It does not close the question of where consciousness begins. It does, however, direct attention to a part of the brain often treated as support infrastructure and asks whether it may be closer to the core of subjective experience than prevailing theories have allowed.
This article is based on reporting by Medical Xpress. Read the original article.
Originally published on medicalxpress.com
