A study has showed that the brain makes decisions about 10 seconds before a person realizes it.
Experts involved in the study said that looking at brain activity while making a decision, they could predict the choices the subjects would make, before they realized that they had made a decision. Lead researcher John-Dylan Haynes, a neuroscientist (神经学家)at the Max Planck Institute for Human Cognitive and Brain Sciences in Leipzig, said that the new findings called into questions for “consciousness”of decisions that people make, and might even challenge ideas as to how“free”people are to make a decision at a particular moment.
“We think our decisions are conscious, but these data show that consciousness is just the tip of the iceberg,”Nature magazine quoted (引用) him as saying. Thinking the results“quite dramatic”, Frank Tong of Vanderbilt University in Nashville, Tennessee, said that 10 seconds is“a lifetime”in terms of brain activity.
During the study, the brains of 14 volunteers were imaged as they performed a decision-making task. The subjects had two buttons before them, each to be operated by a different hand, which they could press when they felt the urge to. They were simultaneously (同时地)shown a stream of letters, which appeared on a screen at half-second intervals (间隔). The volunteers had to remember which letter was showing when they decided to press their button.
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