Next time you ponder doing something risky.

In repeated studies  people with normal brain functioning began to generate anticipatory skin conductance responses (SCRs) whenever they pondered a choice that turned out to be risky.


Before they knew explicitly that it was a risky choice. Results suggest that, in normal individuals, nonconscious biases guide behaviour before conscious knowledge does. 


Without the help of such biases, our overt knowledge may be insufficient to ensure advantageous behaviour.