Fig. 4.

Size of aftereffect (post- minus pre-prism pointing error) for the group of neglect patients and separately for the group of age-matched healthy controls, for both the visual open-loop pointing (VOL) task and for the subjective straight ahead pointing (SSA) task. Numbers along the y-axis represent % of the total prism-induced optical displacement (e.g. a score of 50% would correspond to a 5° shift with the 10° prisms used). Note that our neglect patients show a pathologically large SSA shift due to prism exposure (see also Figs. 1 and 2), but a relatively normal VOL shift, as compared with the healthy controls.