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Retinal versus extraretinal influences in flash localization during saccadic eye movements in the presence of a visible background.

Reexamined the findings of N. Bischof and E. Kramer (1968) and S. Mateeff (see record 1980-06737-001), who postulated the strong use of extraretinal vs retinal information in judging the location of a stimulus flash presented under normal lighting conditions in the temporal vicinity of an eye saccade. Four experiments with 3 Ss replicated Bischof and Kramer's experiment with a wider range of retinal locations stimulated by the flash and investigated the possibility that the previously found effects could be accounted for by retinal rather than extraretinal mechanisms. Results show that 2 kinds of retinal effects had been neglected in the 2 previous studies and that these alone explained the results. The 1st retinal effect was related to differences between the response of the visual system to foveal and peripheral stimuli and may have been active even in the dark. The 2nd retinal effect was related to the fact that smearing of the retinal image of the background occurs when the eye moves. The present experiments show that, when there is a visible background, flash mislocation data can be explained by retinal mechanisms, the action of which can be observed only if data are plotted separately for the different locations stimulated by the flash. (28 ref) (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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