Figure 2.

(A) Illustration of the constant error paradigm. In this paradigm the target was shifted such that the visual error between landing position and target was constant across trials. (B) After several adaptation trials saccades adapt in response to the post-saccadic visual error, but the visual error remains the same. (C) Measurement of apparent probe position was the same as in Figure 1. (D) Time course of saccade amplitude change in the constant error paradigm for 1° (purple), 2° (green)and 3° (orange) outward visual error. As a comparison, saccade amplitude changes form the constant target shift (3°) paradigm are shown in cyan. Error bars represent SEM. (E) Change in apparent probe location after outward adaptation. (F) Time course of saccade amplitude change in the constant error paradigm for 1° (purple), 2° (green)and 3° (orange) inward visual error. (G) Change in apparent probe location after inward adaptation. Data shown in (D–G) is replotted from Zimmermann and Lappe (2010).