Perceived direction of motion vs. detection of global flow in random dot cinematograms

Purpose. A percept of global flow can be evoked by a random dot cinematogram whose spatially-intermingled elements move in diverse directions. The direction of this global flow has been assumed to be at or near the mean direction in which dots moved. A line-element model has successfully accounted for the precision with which one can discriminate the global flows evoked by different cinematograms. We tested the ability of such a model to …