Figure 6. Exogenous Factors (Top) Modulated NDT, Endogenous Factors (Bottom) Did Not.

Note. Data points show group averages, pooled across similar experiments, based on eight saccadic and three manual data sets. Y-axes show average T₀ (continuous lines), alongside mean RT (dashed lines) when available. T₀ is obtained from trials using the signal as interferer. Mean RT for endogenous factors is obtained from the same blocks using no-signal trials. Mean RT for exogenous factors is obtained from separate blocks where the signal is used as target. Error bars show the standard deviation of the group (standard errors were so small that they were hardly visible in the plot for most data sets). ns: nonsignificant (here all p > .2, with BF₀₁ > 2). Data sets included: saccades and brightness (Bompas & Sumner, 2009b; free choice data set); saccades and color (Bompas & Sumner, 2009a); saccades and size (Buonocore & McIntosh, 2012); manual and brightness (manual shape-discrimination stop-task); saccade and strategy (black: Bompas et al., 2020; Campbell et al., 2017; blue: monkey data; Boucher, Stuphorn, et al., 2007); saccade and attention (Buonocore & McIntosh, 2012); manual and strategy (black: Campbell et al., 2017; blue: Boucher, Stuphorn, et al., 2007; red: letter discrimination, T₀ pooled across ignore and stop trials that were interleaved within blocks). BF₀₁ = Bayes factor for the null hypothesis; NDT = non-decision time; RT = reaction time. See the online article for the color version of this figure. * p < .05. ** p < .01. *** p < .001.