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摘要

Flying back to the UK from Finland on a Finnair jet, Stuart King browsed the in-flight shopping catalogue, where he discovered the Valkee Bright Light Headset (see valkee.com). The device looks like an MP3 player, but its earphones emit bright light rather than sound. We are told that the headset "substitutes the mood-elevating effects of the sun, by channeling bright light directly to photosensitive regions of the brain through the ear canal". Apparently, having light shone onto our brains in this way has a very positive effect on our well-being. The website tells us, for example, that "Valkee is effective for curing seasonal affective disorder ('winter blues')".