Posterior parietal stroke impairs post-saccadic updating of visual space in both hemifields and reaction to visual stimuli in the contralesional hemifield

Background/Aim: The posterior parietal cortex is critical for maintaining spatial constancy across saccadic eye movements. This effect was shown by applying the double-step saccade task where the remembered locations of two successively flashed peripheral targets (140 and 100 ms, respectively) have to be fixated in darkness (Heide et al., Ann Neurol 1995). In patients with right posterior parietal lesions the second saccade was dysmetric or performed into the wrong direction, whenever the first saccade implied a leftward contralesional eye displacement, which obviously could not be compensated adequately for upd…