TY  - JOUR
PY  - 2005//
TI  - Intention-based and stimulus-based mechanisms in action selection
JO  - Experimental brain research
A1  - Waszak, Florian
A1  - Wascher, Edmund
A1  - Keller, Peter
A1  - Koch, Iring
A1  - Aschersleben, Gisa
A1  - Rosenbaum, David A.
A1  - Prinz, Wolfgang
SP  - 346
EP  - 356
VL  - 162
IS  - 3
N2  - Human actions can be classified as being either more stimulus-based or more intention-based. According to the ideomotor framework of action control, intention-based 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 [S-R] 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 (intention-based 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.<p /> <p>Language: en</p>
LA  - en
SN  - 0014-4819
UR  - http://dx.doi.org/10.1007/s00221-004-2183-8
ID  - ref1
ER  -