Figure 2

Behavioural results of Experiment 1. (a) Reaction times to discriminate gratings that had a congruent (blue) or incongruent (red) orientation with the prepared grasping action. Error bars show within-subjects 95% confidence intervals (CI)⁶³. (b) Sensitivity to discriminate grasp congruent and incongruent gratings that had relatively large or small orientation differences. Error bars show within-subjects 95% CI. (c) Proportion of responses “same” for congruently (blue) and incongruently (red) oriented gratings across each level of orientation difference (left grating – right grating). The line shows the fit of a psychometric curve collapsed across participants, for illustrative purposes only - model parameters for individual participants were analysed. Error bars show 95% confidence intervals. (d) Estimation of the judgement noise (standard deviation of the cumulative gaussian for the lower and higher boundaries). Error bars show within-subjects 95% CI. *p < 0.01, ns p > 0.05. Figure adapted from²⁹.