Functional Asymmetry in Human Visual Cortex as Revealed by fMRI
Liu Z, Hu X
Emory University, WPI & UMass Medical School
Human visual performance is not uniform across visual field. The origin of this inhomogenity is not clear. Phenomena of horizontal vertical asymmetry (HVA), implying better performance on horizontal than vertical meridian, and vertical meridian asymmetry (VMA), implying better performance in lower than upper visual field, have been studied in psychophysical terms. However, there is little fMRI evidence for these two asymmetries. We investigated these two asymmetries using fMRI and found HVA and VMA can be revealed by fMRI across different subjects. The results of this study may help us understand the neuronal base of these asymmetry phenomena.