Fig. S1. Five possible locations where the two stimuli in each trial could appear. Fig. S2. Graze position changes and response differences between sample and match stimuli in the active and passive tasks. Fig. S3. Response ratio versus gaze changes in active and passive tasks. Appendix S1. (A) Pseudorandomisation used for the stimulus presentation. (B) Comparison of cell responsiveness between active and passive tasks. (C) Eye movement controls.

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