Consciousness remains one of the universe's most profound paradoxes. It is the only phenomenon humans experience firsthand with absolute certainty, yet its true nature—what it is made of, how it functions, and why it exists at all—remains a stubborn mystery. In fact, the harder we attempt to articulate the mechanics of our own minds, the more our language seems to fail us.
In his latest book, A World Appears: A Journey Into Consciousness, acclaimed science writer Michael Pollan wades into this mysterious territory. Embarking on a comprehensive tour of the mind, Pollan examines everything from modern scientific theories and rigorous psychological experiments to the profound effects of psychedelic trips and silent meditation retreats.
To better understand the granular nature of thought, Pollan participated in an unusual psychological study conducted by Russell Hurlburt, a psychologist at the University of Nevada, Las Vegas, who has spent half a century sampling human "inner experience."
The methodology was deceptively simple: Pollan wore a specialized beeper that would sound a sharp tone at random intervals throughout the day. The moment it buzzed, he was tasked with immediately recording his exact thoughts.
What Pollan discovered, however, was a profound banality to his inner monologue. Rather than capturing deep philosophical epiphanies, the beeper often caught him contemplating mundane choices. In one instance, while waiting in line at a bakery, he found himself debating whether to purchase a fresh roll or simply use the leftover heel of a bread loaf sitting at home.
The real challenge emerged during Hurlburt’s follow-up interrogations. When asked to define the exact medium of his bakery thoughts—whether they manifested as spoken language or clear mental images—Pollan found himself at a loss. He described experiencing an unspecific visual, comparing it to an "emoji of a roll" rather than a photorealistic image.
The experiment highlighted a startling reality about the human mind: our thoughts rarely exist as the fully rounded, coherent sentences we imagine them to be. Instead, much of human cognition is composed of what Pollan affectionately calls "gossamer wisps of mentation." Furthermore, Hurlburt's decades of research suggest that many people experience "unsymbolized" thoughts, lacking both words and traditional imagery.
At the conclusion of the experiment, Hurlburt delivered a slightly bruising verdict, determining that the acclaimed writer actually ranked low in "inner mental experience."
Pollan, however, pushed back against the premise of separating the mind's output into neat, isolated chunks. When standing in that bakery, his thoughts were not happening in a vacuum. They were deeply entangled with his sensory environment—the distinct smell of baked goods and cheese, the loud plaid skirt of the woman ahead of him, and the subconscious scanning of the crowd for familiar faces.
To explain this deeply interconnected mental web, Pollan points to the work of William James, the founding father of American psychology. Long before modern neuroscience, James chronicled the lived experience of the mind, coining the concept of the "stream of consciousness." As James theorized—and as Pollan discovered through his own exploration—our thoughts are constantly coloring and infecting one another. They flow together in a continuous, complex current, and attempting to pull a single thought out of that water inevitably disturbs the very nature of the mind.