Results

We found a main effect of task on response times, F(2,96) = 11.35, p <.001, ηp2 =.191, whereby participants were faster in the individual condition than in the joint conditions. For all window sizes, there were main effects of task and spatial compatibility: sample entropy was higher on the individual task than either of the joint tasks, and higher on spatially incompatible trials than on spatially compatible trials (see Figures 2 and 3). We found the same effects of compatibility and task when analyzing maximum deviations (Croker et al., 2015) Discussion The finding that mouse movements on spatially incompatible trials exhibited higher levels of complexity than on spatially compatible trials indicated that two attractors were exerting force in the incompatible condition, an interpretation that is consistent with data showing greater spatial attraction to the distracter on incompatible trials. However, mouse movements exhibited less complexity when participants were completing the task alongside a confederate. We interpret this in terms of constraints arising from the social context: The presence of the confederate reduces the participants ’ degrees of freedom