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Future robots could one day tell how you're feeling by measuring your sweat, scientists say

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Scientists at Tokyo Metropolitan University used skin conductance to assess the emotions of 33 participants.

Skin conductance is a measure of how well skin conducts electricity when you sweat.

The researchers found a correlation between these measurements and videos that elicited feelings of fear, surprise and "family bonding emotions" When combined with other physiological signals, such as heart rate, electromyography and brain activity, the researchers said.