Ragnar Granit

Ragnar Granit (1900–1991) was a Finnish-Swedish neurophysiologist who shared the 1967 Nobel Prize in Physiology or Medicine for discoveries about the eye’s sensory mechanisms.

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Haldan Keffer Hartline: An American physiologist who studied retinal signaling and shared the 1967 Nobel Prize in Physiology or Medicine. His independent recordings from retinal cells complemented Granit’s research on visual signaling.
Retina: The light-sensitive neural tissue lining the back of the eye. Granit recorded electrical responses from retinal cells to investigate how vision begins.
Phototransduction: The process by which a photoreceptor converts absorbed light into a change in electrical signaling. It is the cellular process that links light stimuli to the retinal electrical responses he studied.
Color vision theory: Scientific accounts of how the visual system distinguishes colors from light signals. His retinal recordings supplied physiological evidence relevant to theories of color vision.
George Wald: An American biochemist who elucidated the chemistry of vision and shared the 1967 Nobel Prize in Physiology or Medicine. The third Nobel laureate’s work explained the photochemistry underlying the sensory responses Granit studied.
Photoreceptor cell: A retinal cell that converts light into electrical and chemical signals. Granit’s measurements examined how retinal receptors respond to different wavelengths and light intensities.
Optic nerve: The bundle of retinal ganglion-cell axons that carries visual information from the eye to the brain. Retinal sensory activity ultimately travels toward the brain through this nerve.
Visual neuroscience: The study of the neural systems that process visual information. Granit’s work helped make the retina a site for experimentally studying sensory neural function.
Gustaf Retzius: A Swedish anatomist and histologist known for influential studies of the nervous system. Granit’s early anatomical training in Stockholm developed within a tradition shaped by Retzius.
Electroretinography: A method that records electrical responses generated by the retina after light stimulation. Electrical recordings helped reveal how retinal activity changes with visual stimuli.