Fig. 3
From: Spatial suppression promotes rapid figure-ground segmentation of moving objects
Age-related changes in spatial suppression and motion segregation. In separate blocks, observers discriminated motion directions (up vs. down) of small and large stimuli (a), and that of an oval object (b, right). In the motion segregation task (b, left), observers identified the orientation of a motion-defined object (left tilt vs. right tilt). Block arrows and the object outline are shown for illustration purposes only. Scale bar is 1°. (c) The effect of stimulus size on motion direction discriminations in young and older adults. Suppression index is defined as log10(large size threshold) – log10(small size threshold). (d) Motion segregation and motion discrimination of an oval shape in young and older adults. Motion segregation efficiency is defined as log10(figure-motion threshold) – log10(motion segregation threshold). All error bars are s.e.m.
