Robert J. Snowden, Alan B. Milne  Current Biology 

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Phantom motion aftereffects –  evidence of detectors for the analysis of optic flow  Robert J. Snowden, Alan B. Milne  Current Biology  Volume 7, Issue 10, Pages 717-722 (October 1997) DOI: 10.1016/S0960-9822(06)00329-0

Figure 1 Schematic illustration of the stimuli used in our experiments. (a) A pattern used in the adaptation phase –  one undergoing a clockwise motion is illustrated. Note that, whilst each element moves with a linear motion, the direction of movement (depicted by the direction of the arrow) and speed (depicted by the length of the arrow) vary so as to simulate the specified motion. (b) An example of a concrete test pattern undergoing clockwise rotation with a signal strength of 50% (pink arrows). Note that the ‘noise’ elements (blue arrows) have the same speed but random direction. (c) An example of a phantom test with an anticlockwise motion of 20%. Current Biology 1997 7, 717-722DOI: (10.1016/S0960-9822(06)00329-0)

Figure 2 The probability of choosing the ‘adapted’ direction is plotted as a function of signal strength after no adaptation (red symbols), concrete adaptation (blue symbols) or phantom adaptation (green symbols). The observer is MR. The curves are least squared error of the function shown in equation (1), with β set at 0.15. Current Biology 1997 7, 717-722DOI: (10.1016/S0960-9822(06)00329-0)

Figure 3 The PSE –  parameter θ from equation (1) –  is plotted for each observer over the four experiments. The asterisks indicate the PSEs that differed significantly from 0 (see Materials and methods). Current Biology 1997 7, 717-722DOI: (10.1016/S0960-9822(06)00329-0)