2013年3月26日火曜日

Predicting free choices for abstract intentions


Chun Siong Soon, Anna Hanxi He, Stefan Bode, and John-Dylan Haynes
PNAS March 18, 2013 201212218

抽象的な意思決定(例:足し算をするか引き算をするか)であっても、意識に上る数秒前にはすでに行われている。意識的に決定を行う四秒前の脳活動(前頭極、楔前部のfMRI信号)から、その後の意思決定を予測できる。 http://www.pnas.org/content/early/2013/03/14/1212218110

Unconscious neural activity has been repeatedly shown to precede and potentially even influence subsequent free decisions. However, to date, such findings have been mostly restricted to simple motor choices, and despite considerable debate, there is no evidence that the outcome of more complex free decisions can be predicted from prior brain signals. Here, we show that the outcome of a free decision to either add or subtract numbers can already be decoded from neural activity in medial prefrontal and parietal cortex 4 s before the participant reports they are consciously making their choice. These choice-predictive signals co-occurred with the so-called default mode brain activity pattern that was still dominant at the time when the choice-predictive signals occurred. Our results suggest that unconscious preparation of free choices is not restricted to motor preparation. Instead, decisions at multiple scales of abstraction evolve from the dynamics of preceding brain activity.

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