Georg K, Lappe M, 2006, "Independent effects of saccadic adaptation on spatial localisation before and during saccades" Perception 35 ECVP Abstract Supplement
Independent effects of saccadic adaptation on spatial localisation before and during saccades
K Georg, M Lappe
Short-term saccadic adaptation induces a shift of perceived localisation of objects flashed early before the saccade, and a compression towards saccade landing position of objects flashed immediately at saccade onset (Awater et al, 2005 Journal of Neurophysiology 93 3605 - 3614). We tested whether the early-presaccadic shift and the peri-saccadic compression are independent or related processes. In our experiment, subjects had to indicate the perceived location of briefly presented stimuli after saccadic adaptation. Because the strength of peri-saccadic compression depends on stimulus contrast, we performed experiments with two different contrast conditions. The first condition yielded large peri-saccadic compression, the second yielded no peri-saccadic compression. The early-presaccadic shift and saccadic compression proved to be independent of each other. Early-presaccadic shift occurred similarly in the conditions with and the conditions without peri-saccadic compression. Peri-saccadic compression, when present in a condition, was additive to the early-presaccadic shift. Our results clarify the time course of the adaptation-induced presaccadic shift and have implications regarding the possible mechanisms of both effects.
[Supported by the DFG LA952/3.]
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