Affectiva (@affectiva), developers of the Q Sensor, a wearable biosensor that uses galvanic skin response to measure individuals emotions, has announced they have raised a $12 million Series C round.

The round was led by Horizon Ventures, the Hong Kong-based investment group representing Chinese billionaire Li Ka-shing, and included the Kleiner Perkins Caufield & Byers (KPCB) Digital Growth Fund.

This brings the Cambridge, MA-based startup’s total capital raised to just over $20 million, which includes several federal research grants.

Affectiva (@affectiva) was spun-out of the Affective Computing Group at the MIT Media Lab in 2009 by professor Rosalind W. Picard, Sc.D. (@rosalindpicard) and research scientist Rana el Kaliouby, Ph.D. and has since gone on to deploy its body sensor network technology in numerous settings to detect and record physiological signs of stress and excitement by measuring slight electrical changes in the skin, known as electro-dermal activity (EDA).