Sten Grillner's group at the Karolinska Institute in Stockholm has therefore spent many years studying lampreys, in order to gain insights about vertebrate nerves.

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In 2005, a Swedish stem cell biologist at the Karolinska Institute in Stockholm, Jonas Frisen, decided to see if he could date people using the same technique.

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Now based at the Karolinska Institute in Stockholm, Sweden, Dr Ehrsson told CNN that his study has already caught the eye of virtual reality researchers and video game developers.

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He discovered a paper in a 2006 issue of the journal Nature co-authored by Bruce Buchholz, a physicist at Lawrence Livermore National Laboratory and Kirsty L. Spalding of the Karolinska Institute in Stockholm.

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