Extended Data Fig. 6: Similarities of human foveolar maps with this study. | Nature Neuroscience

Extended Data Fig. 6: Similarities of human foveolar maps with this study.

From: Multiple loci for foveolar vision in macaque monkey visual cortex

Extended Data Fig. 6

(A) Phase encoding retinotopic mapping adapted from Schira 2009 Fig. 5 reveals nonhomogeneous foveolar region (inside dashed ovals). (B) pRF analysis of retinotopic mapping adapted from Doumulin 2008 Fig. 5. Dashed oval: non-homogenous central area. Note several red foveolar loci at the ends of VM and HM (black arrows) on the dashed ring, an organization similar to what we find. These maps reveal strong similarities with our phase encoding maps, though this organization was not previously recognized. Close perusal of these images reveals the presence of similar foveolar loci along a ring surrounding a central nonhomogeneous region (A). Although statistical thresholding was used, it would be important to see the strength of correlation of phase encoding for the central field voxels. We also found potentially similar published results using retinotopic mapping by pRF analysis14 (B). The central area in these maps was not homogeneous and exhibited focal red loci which fell at the end of the VM and HMs and on a ring that encircled what may be the foveolar core. Other published phase encoded maps also illustrate VM and HMs that stop short of a common center. We suggest that the core region does respond to foveolar stimuli, but their receptive fields may not be topographically ‘foveola only’ (for example the lack of response to small focal stimuli and, in some cases, preference for large stimuli, see Fig. 5 on functional domains).

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