Figure 6.

No left-right hemifield difference. Changes in (a) SF threshold and (b) SF cutoff as a function of polar angle for the left and right hemifields. Polar plots of hemifields (left panels) show group-averaged SF estimates as a function of polar angle for the left and right hemifield locations separately (the data points corresponding to the UVM and LVM are color-coded as in Figure 1). Right panels show the same data with error bars corresponding to ± 1 SEM. No difference was observed between the left and right visual field (VF) locations. The asymmetry with polar angle between lower (−90° to 0°) and upper (0° to +90°) VF locations is characteristic of the VMA (HM = horizontal meridian; UVM/LVM = upper and lower vertical meridians).