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Sergey Artemenkov; The effect of reversing seeing of initial and final locations of shortly presented high speed contracting and dilating objects. Journal of Vision 2007;7(9):753. doi: 10.1167/7.9.753.
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© ARVO (1962-2015); The Authors (2016-present)
Visual appearance of moving or size-changing (either dilating (A) or contracting (B)) objects, which are shortly presented during the gaze fixation period (GFP), is usually connected with impossibility of clear seeing the start of the movement processes, while other stages of them basically is possible to observe. This is understandable assuming that perception of the movement location requires the possibility of organizing relations between signals coming at different moments of time, and realizing that initially these relations is not possible to obtain locally. It was shown (Artemenkov, VSS, 2005) that for high size-changing speed (around 40 deg/s and more) human visual perception (HVP) of A and B objects presented within a range of short durations (10–100 ms) is accompanied with unusual differences, e.g. appeared in effect of reversing seeing of initial and final locations of A and B contour objects: for A it is still impossible to perceive the initial stage and possible to see the final stage of the process, while for B there is quite opposite situation - the initial location is perceived and it is not possible to observe the end of the process. Studies of this phenomenon reveal that it may indicate the presence of an internal center-symmetric process anisotropy in the form creation process (FCP) having place during the GFP. If time needed for the initial FCP (or overall space integration) is increased with the size of the object and this process has a certain speed of formation then in case of high enough speed of objects' contraction their pictures coming later in time may reach the FCP image earlier than pictures, which came earlier. These causes presenting effect which may become a useful psychophysical tool for revealing internal mechanisms of the HVP and the determination of functional range of the form and movement perception.
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