The Where and When of Intention

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Science  20 Feb 2004:
Vol. 303, Issue 5661, pp. 1144-1146
DOI: 10.1126/science.1095331

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Although a subjective urge-or intention-to act appears to precede a voluntary action by almost a quarter of a second, neuroscientists have not had a clear picture of the brain activity that underlies this intentional state. In his Perspective, Eagleman discusses new work ( Lau et al.) that uses functional magnetic resonance imaging to distinguish brain areas that are activated in response to the intention to move versus the actual movement.