Qualia

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For a long time, philosophers like Thomas Nagel and David Chalmers (The Hard problem of consciousness) argued that "qualia"—the private, subjective nature of individual experiences, such as how you perceive the color red—was a mystical concept fundamentally inaccessible to scientific measurement. This view, often tied to the "hard problem of consciousness," asserted that physical data could never truly explain or capture subjective feelings. However, a recent breakthrough study has challenged this notion by using fMRI to monitor the brain activity of 35 participants while viewing different colors. Researchers discovered consistent neural signatures shared across different individuals, providing the first objective, structural evidence that your perception of a color is approximately the same as someone else's.

This discovery is part of a broader shift toward quantifying consciousness through scientific and mathematical frameworks. For instance, neuroscientist Anil Seth has proposed a model where qualia function as part of a predictive algorithm, mapping how the brain constantly anticipates and corrects its understanding of sensory input. Organizations like the Qualia Research Institute are working to map the entire mathematical state space of consciousness, while contemporary philosophers are beginning to treat subjective elements like color as objectively real as temperature. Ultimately, cracking the code on how to measure these neural signatures could pave the way for a future where humans can directly share subjective experiences with one another.

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The video explores the philosophical concept of qualia—the private, subjective raw feelings of individual experiences, such as what the color red looks like or what chocolate tastes like inside your mind. Because color does not exist objectively in the physical world but is instead an internal illusion created when our brains translate a specific range of the electromagnetic spectrum, it is impossible to directly observe someone else's visual perception. This disconnect creates an "explanatory gap," making it fundamentally difficult to share internal experiences, as evidenced by how sensory metaphors fail to accurately describe the visual concept of color to someone who has been blind since birth. While some philosophers suggest this limitation is a failure of human language rather than a permanent scientific impossibility, we currently remain isolated with our own unique perceptions.

The video then transitions to what makes humans unique in coping with this internal isolation, highlighting our development of a Theory of Mind—the cognitive understanding that other individuals possess separate minds with unique knowledge and access to information. While great apes can use sign language to communicate, answer questions, and express emotions, no signing ape has ever actually asked a question. This lack of questioning suggests that while animals are curious, they do not realize that humans can serve as separate sources of information that they themselves lack. Humans aren't born with this trait either, as demonstrated by the Sally-Anne psychological test, where children under the age of four fail to realize that another person's knowledge of a hidden object can differ from their own.

Ultimately, the video concludes that while we are isolated within our own consciousness and cannot definitively prove if "your red" is the same as "my red," our ability to recognize this gap is a beautiful defining feature of humanity. The mere fact that we can ponder our internal experiences, recognize that others have independent minds, and ask each other questions is what unites us. Michael Stevens closes with an encouraging reminder to lean into this uniquely human trait by staying curious and continuing to ask questions about the world and each other.