ImPulse (by Lotan et al, 2007)

 

The devices sense pulse through palm contact and wirelessly transmit heartbeats to the paired unit through light flashes and vibration.

Source: Lotan, G. and Croft, C. 2007. imPulse. In Extended Abstracts on Human Factors in Computing Systems (CHI’07). ACM Press, 1983–1988.
http://xncroft.com/imPulse
http://giladlotan.com/impulse/

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