刺激間距離によるフランカー干渉の変化のdiffusionモデル

抄録

We examined selective attention processes involved in the Eriksen flanker task by using hierarchical diffusion models. The model proposed by White, Ratcliff, and Starns (2011) assumed that attention is initially distributed across all stimuli, and that the attentional spotlight narrows to focus on the target stimulus during the time course of a trial. Our study extended this model to account for the well-known effect that the flanker interference decreases as interstimulus spacing broadens. The previous model did not fit the observed data of our experiment well. Therefore, we have proposed an alternative method of calculating the information accumulation rate within a trial, as the ratio of target-related information to all the inputs. Moreover, the model fit was improved by assuming a more converged distribution than the normal distribution as representing attentional distribution.