Cite as:
Zimmermann E, Lappe M, 2007, "Saccadic adaptation-induced shift scales with adaptation magnitude" Perception 36 ECVP Abstract Supplement

Saccadic adaptation-induced shift scales with adaptation magnitude

E Zimmermann, M Lappe

We investigated the effect of saccadic adaptation on the perceived localization of briefly flashed bars. When the stimuli are presented ~200 ms before the onset of the saccade, subjects usually tend to mislocalize them. In order to elucidate whether this effect is directly linked to the sensorimotor transformation of saccadic adaptation, we compared different degrees of adaptation with respect to the localization error. Three conditions (10%, 20%, 30% adaptation of the intended saccade) were established, such that the adapted saccade always had an 10° amplitude. The results demonstrate that, although in the adapted state subjects always make the same saccade, the extent of the mislocalization increases linearly with the amount of saccadic adaptation. In addition, we used two different paradigms to generate saccades: an overlap paradigm (to generate more voluntary saccades) and a no-overlap paradigm (to generate more reflexive saccades). The similar pattern of perceptual judgments in these two paradigms implies that the localization error originates at a level in the oculomotor system where both types of saccades are processed together.

[Funded by the German Federal Ministry of Education and Research.]

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