The effect of dynamic dots texture on motion extrapolation L Battaglini, G Campana, C Casco |
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Department of General Psychology, University of Padua, Italy
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| People are able to judge the current position of occluded moving objects. This operation is known as motion extrapolation. It has been suggest that motion imagery associated with a movement of visuospatial attention is involved in this task. We run two experiments to underlie the importance of motion interference on motion imagery. Participants had to predict the position of occluded target indicating the time to contact (TTC) with the end of the occluder. The occluder was a texture of randomly positioned dots. In the first experiment the dots moved either in the same way of the moving target or in the opposite direction. Results showed longer TTC when dots moved in opposite direction, suggesting an interference of dots texture direction of motion when incongruent with the visuospatial tracking direction. In the second experiment the dots were either static or dynamic (each dot moved in a random direction). Results showed shorter TTC with dynamic dots texture. The TTC reduction cannot simply be the result of visual noise added on motion extrapolation. More likely, randomly moving dots texture “speeds-up” motion extrapoation. These results are coherent with fMRI findings of an activation of motion areas (MT) during extrapolation of occluded motion. |
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