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Fig 4. Correlation between the extent of the visual field defect and the T-R distance. Although there is a slight tendency for the T-R distance to appear larger in cases that have more severe visual field defects, overlap between the groups is quite large. No statistically significant differences could be observed by the ANOVA test. (Cases with anterior temporal lobectomy are shown in black, and cases with selective amygdalohippocampectomy are shown in white.)