Figure 8.

Illustrations of alternative explanations of the compatibility effect and its relationship to the SOA. The dotted line to the right of the Go stimulus illustrates the presentation of the Go stimulus. (A) The imperative stimulus directly activates the representation of the effect. Depending on the activated effect codes the response is selected. A compatible Go stimulus would contribute to the activation of the same effect code and therefore facilitate the selection of the response, provided the Go stimulus was presented before the completion of the response selection. (B) The response is selected depending on the imperative stimulus. After response selection the effect of the response is anticipated to enable the monitoring of the response and error detection. The anticipation is supported by a compatible Go stimulus throughout response preparation.