Abstract
Human actions can be classified as being either more stimulus-based
or more intention-based. According to the ideomotor framework of
action control, intentionbased actions primarily refer to anticipated
action effects (in other words response-stimulus R-S bindings),
whereas stimulus-based actions are commonly assumed to be more strongly
determined by stimulus-response SR bindings. We explored differences
in the functional signatures of both modes of action control in a
temporal bisection task. Participants either performed a choice response
by pressing one out of two keys in response to a preceding stimulus
(stimulus-based action), or pressed one out of two keys to produce
the next stimulus (intentionbased action). In line with the ideomotor
framework, we found intention-based actions to be shifted in time
towards their anticipated effects (the next stimulus), whereas stimulus-based
actions were shifted towards their preceding stimulus. Event-related
potentials (ERPs) in the EEG revealed marked differences in action
preparation for the two tasks. The data as a whole provide converging
evidence for functional differences in the selection of motor actions
as a function of their triggering conditions, and support the notion
of two different modes of action selection, one being exogenous or
mainly stimulus-driven, the other being endogenous or mainly intention-driven.
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