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Summary: Frontiers in Neuroscience www.frontiersin.org May 2010 | Volume 4 | Issue 1 | 3
FRONTIERS COMMENTARY
published: 15 May 2010
doi: 10.3389/neuro.01.003.2010
signal strength analysis revealed that
both processes interact with one another.
In particular, neural activity within the
paramedial frontal cortex was increased
for internal as compared to external timing,
but only when action selection was speci-
fied externally. Combined, these observa-
tions challenge the idea of a unitary control
system and underscore the existence of
distinct, albeit interdependent, decisional
processes that together shape voluntary
action (Brass and Haggard, 2008). Of note
is that this dependency is in accordance
with the argument that aspects from the
component processes have to be considered
in order for an action and its consequences
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