Martin Pistorius lay in a vegetative state for 12 years until doctors declared his consciousness lost forever. But a caregiver noticed eye movements that no one else had seen—and it turned out that he had been aware of what was happening the entire time, trapped in a kind of prison within his own body. Neuroscientist Christof Koch, director of the Allen Institute for Brain Science and one of the leading researchers of consciousness, points to a serious problem: doctors misdiagnose the vegetative state in approximately 40% percent of cases, confusing it with a minimally conscious state. This means that many patients who appear to be deeply unconscious are actually hearing and seeing everything around them.
The gap between behavior and awareness calls into question standard clinical criteria. Koch emphasizes that consciousness is not a binary phenomenon, as is often thought, but a spectrum that can fluctuate from vivid wakefulness to faint flickers. At the same time, reflexive eye movements or spontaneous twitches do not prove the presence of experience, just as their absence does not prove the absence of awareness. Standard clinical tests are simply not sensitive to more subtle forms of perception.
In the context of integrated information theory, which Koch is developing together with neuroscientist Giulio Tononi, consciousness depends not on behavior, but on the brain's ability to integrate information. Koch distinguishes phenomenal consciousness—the subjective experience itself—from the accessibility of that experience and from self-awareness. Animals and infants may experience pain or fear without having a concept of themselves as subjects. Plants, in his view, are most likely devoid of consciousness, since integrating information requires a brain system, although science does not yet have a definitive answer.
Methodologically, Koch's interview relies on clinical observations, personal testimonies, and functional MRI data revealing activity in the brains of patients who appear unconscious. But Koch does not hide the limitations of modern techniques: even when science records the brain activity that supports consciousness, communication with the patient remains extremely difficult. An eyelid movement or a moment of cortical activation is far from a dialogue. Therefore, the question remains open as to exactly which neural mechanisms enable the activation of experience without visible behavioral markers.
Pistorius himself described his state figuratively: it is like being locked in a room without windows or doors, where you see and hear everything happening outside, but cannot knock on the wall or shout. This is the very metaphor that Koch now uses to explain that consciousness can be fully present but completely invisible to an outside observer.
The conversation with Koch shows that consciousness research depends on the ability to distinguish between the neural correlates of subjective experience and the neural correlates of behavior—these are fundamentally different things. This distinction directly affects the ethics of patient care in disorders of consciousness, clinical decision-making, and future attempts to assess whether an artificial system can truly possess experience rather than merely simulating it.
