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. Author manuscript; available in PMC: 2022 Oct 1.
Published in final edited form as: Atten Percept Psychophys. 2021 May 25;83(7):2784–2794. doi: 10.3758/s13414-021-02316-y

Fig. 1. Schematic representation of a typical visual performance field.

Fig. 1

The center point (intersection of the cardinal lines) represents chance performance and more eccentric points represent higher performance. (1) Horizontal-vertical anisotropy (HVA): better performance at isoeccentric locations along the horizontal (left horizontal meridian (LHM) and right horizontal meridian (RHM) locations) than vertical (upper vertical meridian (UVM) and lower vertical meridian (LVM) locations) meridian of the visual field, and (2) vertical meridian asymmetry (VMA), better performance at the location directly below fixation (LVM) than directly above (UVM).