From Vernon C. Barber
Your report on detecting longer wavelengths of red light with a modified human visual protein (15 December 2012, p 19) suggests a way for us to see auras.
If some people naturally have mutated versions of such proteins that are stimulated by infrared radiation, then the phenomenon would be possible.
The editor writes:
• We recently published a story on auras (5 January, p 13). They do exist for some people, but it’s likely they stem from rewiring in the brain rather than differences in proteins in the eye.
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