... this ability e.g. stopping talking when interrupted, avoiding a falling object when walking a straight line. Inhibitory control can be linked to automatic behaviours and attention control. Logan & Cowen (1984) developed a theory to account for inhibition of thought and action. Control is performed by an executive system which forms intentions and give commands to a subordinate system, which performs the commands. One example of a command is the control of inhibition. This theory developed a 'Horse-Race' Model explaining inhibition. A stop signal starts a stopping process which 'races' with other thought processes already running. If the stopping process wins, inhibition occurs. If another process wins, the action runs on until completion. The processes are independent (see figure 1). Figure 1: Diagrammatic example of the Horse-Race Model. To the left of the line the response to the primary task is faster, and to ...

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