A heart cell in a Petri dish contracts, and at that moment, an electrical wave sweeps across its surface. Previously, to catch that wave, you had to poke the cell with an ultra-fine electrode needle. Now, you just look at it under a microscope.
The method is called electrochromic recording. A material is applied to the glass that changes color when the electric field nearby changes. The cell beats, the field oscillates, the spot beneath it darkens and lightens. A camera captures these fluctuations at thousands of frames per second.
Previously, such an experiment required a bulky setup with a separate light source and lenses. Now everything fits into a standard microscope: you look at the cell and simultaneously record its electrical pulse. This opens the method to thousands of labs studying the heart, brain, and other tissues.
Cells are no longer silent. Their conversation becomes visible, like fireflies in a night forest.
Electrochromic materials are the same ones used in smart windows that darken at the push of a button. Only here, they respond to biological electricity, not current from a wall socket.
In the series 'Altered Carbon,' consciousness is recorded on a crystal — here, the cell's electrical pattern turns into a light pattern, almost like a hologram.