Linking lower and higher stages of motion processing?


Mareschal I, Ashida H, Bex PJ, Nishida S, Verstraten FA. Linking lower and higher stages of motion processing?. Vision Research [Internet]. 1997;37 :1755–9.


The spatial frequency selectivity of motion detection mechanisms can be measured by comparing the magnitude of motion aftereffects ({MAEs)} as a function of the spatial frequency of the adapting and test gratings. For static test gratings, narrow spatial frequency tuning has been reported in a number of studies. However, for dynamic test patterns, reports have been conflicting. Ashida & Osaka [(1994). Perception, 23, 1313-1320] found no tuning whereas Bex et al. [(1996) Vision Research, 36, 2721-2727] reported a narrow tuning. The main difference between the two studies was the temporal frequency of the test pattern. In this study we measured the spatial frequency tuning of the {MAE} using test patterns for a range of temporal frequencies. The results confirmed that there was narrow spatial frequency tuning when the test pattern was counterphasing at a low temporal frequency. However, the spatial frequency selectivity broadened as the temporal frequency of the test pattern was increased.