Frequency plot of principal directions of movement for all trials and participants in Movement condition.

<p>The principal direction corresponded to the eigenvector associated with the largest eigenvalue of the trial orientation matrix. A principal direction was computed for each trial, but only those for which the eigenvalue exceeded. 5 and the ratio of second and largest eigenvalues was less than. 8 were included in the plot (1147 out of the 1190 trials). The red and orange dots represent the two directions usually tested in the literature: toward the target (AP) and laterally (ML), respectively.