Before you work up the nerve to leap off a bungee-jumping platform, there will be a sharp, measurable increase in your brain activity, almost a full second before you make the conscious decision to jump. A new paper describes the first time this effect has been measured outside the laboratory.

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Before you work up the nerve to leap off a bungee-jumping platform, there will be a sharp, measurable increase in your brain activity, almost a full second before you make the conscious decision to jump. A new paper describes the first time this effect has been measured outside the laboratory.