Figure 3 | Scientific Reports

Figure 3

From: Qualitative speed-accuracy tradeoff effects that cannot be explained by the diffusion model under the selective influence assumption

Figure 3

Effects of SAT. (A) The effect of SAT and contrast manipulations on d’ and mean RT. Higher contrasts resulted in higher d′ and lower RT, whereas stronger accuracy stress led to higher d′ and higher RT. All d′-RT curves are approximately linear. (B) RT difference between error and correct trials. The RT difference formed a robustly U-shaped curve as a function of SAT such that the minimum value (where error RTs are faster than correct RTs) occurred for the “fast” condition. On the other hand, the lack of any speed stress in the “extremely slow” condition resulted in error RTs being slower than correct RTs. (C) Ratio between the SD and mean of RT distributions as a function of SAT. The \(\frac{{SD\left( {RT} \right)}}{{mean\left( {RT} \right)}}\) ratio exhibited a U-shaped curve as a function of SAT for all contrasts. In addition, the ratio monotonically decreased with higher contrasts. (D) RT distribution skewness. The skewness of the RT distribution formed robustly U-shaped curves for all contrasts with the minimum skewness occurring for the “fast” condition. In all subplots, lines represent different contrast levels, symbols represent different SAT conditions (circle: “extremely fast” condition; triangle pointing down: “fast” condition; triangle pointing up: “medium” condition; square: “slow” condition; star: “extremely slow” condition), and error bars represent S.E.M.

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