Scientists Engineer a New Color Outside Human Vision Range: "Olo"

Researchers have successfully enabled five participants to perceive a completely new color—beyond the natural range of human vision—by selectively activating specific retinal cells using advanced laser and tracking technology. This vivid blue-green hue, named "olo", exhibits a level of saturation far exceeding any naturally occurring color.

Published in Science Advances, the study is based on the principle that human color perception relies on the combined signals of three types of cone cells (S, M, and L). Since M-cones are typically activated alongside neighboring cells, scientists at the University of California, Berkeley developed a technique to stimulate M-cones in isolation. This novel approach generated a color experience previously inaccessible to the human eye. During trials, subjects had to add white light to match "olo" with known colors, highlighting its extraordinary saturation and uniqueness.

Dubbed "Oz", the technique is controlled by a software system called "Wizard", which precisely modulates the light received by individual retinal cells to simulate or create entirely new visual signals. While currently limited to a small visual field and dependent on specialized lab equipment, researchers believe the method could eventually aid individuals with color vision deficiencies by allowing them to distinguish colors they otherwise couldn't perceive.

The technology also opens the possibility of simulating full-color vision using single-wavelength lasers. By manipulating individual photoreceptor responses, the brain can be tricked into perceiving colors that aren't physically present. The team is exploring applications such as artificial enhancement of color perception through mimicked signal input from a "third" cone cell, potentially benefiting those with color blindness.

This groundbreaking work not only expands our scientific understanding of color perception but also lays the foundation for future innovations in vision enhancement. Though still in its early stages, its long-term implications could surpass current optical technologies.