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Visuoperceptual and visuospatial tasks. (A) An example of a figure sequence presented in the visuoperceptual task. Subjects were asked to press the key when the target image indicated by the arrow appeared. (B) An example of a figure sequence presented in the visuospatial task. Subjects were asked to press the key when coupled figures resulted different (as indicated by the arrow). For both tasks, seven slices lasting 3 s were presented during each epoch.
