Figure 2. A, Left, Evidence-locked microsaccade rate for fast (952 ms) and slow (1293 ms) RT bins. For all signal time series, shaded areas represent 95% confidence interval of within-subjects SE. Dashed vertical lines all mark CPP onset for each RT bin in plots A, B, and C. Middle, Response-locked microsaccade rate. Right, Surface plot of microsaccade rate sorted along the y-axis by RT z-scored inside participant, interchange interval duration, and contrast change direction to facilitate the pooling of data across participants and exclude the influence of the aforementioned experimental factors. Overlaid black line represents regular RT sorted by z-scored RT. Both signal and RT were smoothed using a Boxcar filter of 100 trials. B, Left, CPP for fast and slow RT bins. Similarly to microsaccadic inhibition, the CPP onsets at ∼370 ms, with faster buildup rate before earlier RTs (F(1,16) = 16.98, p = 0.0008, g.e.s. = 0.22). Right, Consistent with its characterization as a decision variable, the CPP reached peak amplitude at manual response. C, Left, LHB power for fast and slow RT bins. LHB power began to decrease at ∼560 ms and this decrease was stronger for faster RTs (F(1,16) = 4.5, p = 0.049, g.e.s. = 0.01). Again, to be expected for a signal related to motor preparation, the negative peak in power was aligned with manual response.