Cortical Activation during Landmark-Centered vs. Gaze-Centered Memory of Saccade Targets in the Human: An FMRI Study

摘要

FIGURE 1. Experimental paradigm and eye trajectories for each of the three saccade conditions from one representative participant. (A) The display of the visual stimuli is identical for the three tasks (Landmark Saccade, Control Saccade, and Color Report). The critical difference between the two saccade tasks is the reference frames used for the coding of target location for the upcoming saccade. In the Landmark Saccade task, target location is encoded relative to the landmark. In the Control Saccade task, target location is encoded relative to initial gaze position. In the Color Report task, the color of the target, rather than location, is being remembered and reported. (B) Eye trajectory for the pro-saccade condition in the Control Saccade task. The first and second vertical gray lines indicate onset and offset of the delay phase, respectively. The third and fourth vertical gray lines indicate start of a saccade response and end of the saccade by making gaze back to the central fixation point. (C) Eye trajectory for the anti-saccade condition in the Control Saccade task. Legends as in (B). (D) Eye trajectory for the Landmark Saccade task. Legends as in (B).