Abstract

The proportion congruency (PC) effect is a congruency effect that decreases as the ratio of congruent to incongruent trials within a given block increases. Researchers have been interested in the transference from a set of congruent to incongruent trials, with different ratios to a set of congruent and incongruent trials with equal ratios (diagnostic task). This present study investigated whether the PC effect is transferred across tasks with a coexisting Stimulus-Response conflict (Simon task) and Stimulus-Stimulus conflict (spatial-Stroop task) in a Stimulus-Response compatibility task. Right-handed students (N = 16) were required to identify the direction of an up/down arrow presented in four possible locations (right/up, right/down, left/up and left/down). We observed the transference from two perspectives, i.e., the Simon and spatial-Stroop views. The results indicated that the PC effect was not transferred across different types of conflicts. Therefore, these results suggest that attentional control in the Simon and spatial-Stroop tasks is independent and has a simultaneous effect.

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