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The search for consciousness may be stalled partly by the question researchers are asking. In Scientific American’s October 2026 essay, philosopher Tim Bayne proposes that a familiar word might conceal an unreliable scientific category. Before building a detector that decides whether an infant, animal or machine is conscious, researchers may need to reconsider what that detector would measure.

The problem begins with disagreement over terminology. Across disciplines, consciousness can mean awareness, sentience, experience or qualia—the felt qualities of experience. Replacing one word with another does little to establish whether researchers are investigating the same phenomenon.

A more concrete approach starts with recognizable experiences: a taste, a sensation against the skin or a visual scene. Philosopher Ned Block introduced the term phenomenal consciousness in the 1990s for this subjective aspect of mental life. The concept has since helped organize research and debates about which beings deserve moral consideration. Yet its familiarity does not establish that it captures a single underlying feature shared by every possible kind of mind.

A familiar concept with a particular history

Bayne challenges the assumption that phenomenal consciousness is a universal starting point. He cites philosopher Kathleen V. Wilkes’s argument that ancient Greek, Mandarin, Croatian and English before the 17th century lacked exact equivalents for the concept. He also discusses rakizuam, a Mapudungun term that includes awareness of relationships with other people and the natural world. That emphasis differs from the English concept’s focus on subjective experience.

The linguistic comparison has a limited role. A language’s lack of a corresponding term cannot establish that a phenomenon is unreal; scientific concepts often arrive long after the things they describe. Instead, these examples suggest that the current vocabulary is one historically situated way of organizing questions about minds. Its apparent inevitability deserves scrutiny.

Better questions may require different categories

A scientific concept earns its place by helping researchers explain and predict. Bayne asks whether consciousness groups together mental phenomena that share an underlying nature. It could instead combine processes that need separate explanations, or separate processes that belong together.

The history of science offers precedents. Phenomena once grouped as fire turned out to involve very different mechanisms, including combustion, nuclear fusion and bioluminescence. Other advances required distinctions within familiar ideas: average versus instantaneous velocity, or heat versus temperature. Scientific progress changed the categories as well as the answers.

Bayne’s essay offers a conceptual argument, with no new experiment or proposed test that settles where consciousness exists. He leaves open the possibility that the existing concept will remain scientifically useful. It already helps describe human mental life and may be indispensable for that purpose. The uncertainty grows when it is extended to beings or systems very different from adult humans.

His proposal is to keep investigating consciousness while allowing the investigation to reshape its central question. Asking whether a baby, bee or AI system is conscious remains worthwhile. But researchers should also ask whether that single classification captures the differences they need to understand. A breakthrough might involve discovering that several more precise questions are needed where one apparently obvious question now stands.

Source: Tim Bayne, “What Is Consciousness, Really?” Scientific American, October 2026, pp. 54–57.