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. 2015 Jun 3;32:E010. doi: 10.1017/S0952523815000073

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© Cambridge University Press 2015

The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike licence <http://creativecommons.org/licenses/by-nc-sa/3.0/>. The written permission of Cambridge University Press must be obtained for commercial re-use.

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Fig. 3. — Model Predictions. Topography of receptive field locations (A, D) and labeled interareal connections in V1 and V2 (B-C, E-F) predicted by the V3-only model (A–C) and by the multiple-areas models (D–F). Conventions are as in Fig. 1, but here gray shaded regions indicate regions representing the upper visual quadrant, and white regions those representing the lower quadrant. (A, D) The arrows represent a caudorostral progression of recording sites in V2 (green) and cortex rostral to V2 (red). In each panel, the arrows in the inset to the left indicate the predicted trajectories in the visual field of neuronal receptive fields recorded at the respective cortical sites, according to each model. (B) A hypothetical series of tracer injections (outlined circles), starting near the caudal border of V3d (light blue) and ending with an injection (darkest blue) that straddles the border between V3d and the upper field representation of an area rostral to it (DM or V3A). Here and in panels (C, E-F), the inset to the left indicates the eccentricities of the hypothetical injection sites projected onto the visual field. Only the darkest blue injection site is expected to produce label in upper field V1 and V2, as it straddles a region of the upper visual field; all the other injection sites are expected to produce label only in lower field V1 and V2. Black arrows point at the injection site that straddles the caudal border of upper field DM/V3A, as well as to the label at the vertical meridian representations of V1 and V2 resulting from this injection. (C, F) A hypothetical series of tracer injections across the width of dorsal V2, and expected location of resulting label in V1 and third tier cortex, according to each model. The V3-only model predicts a single label reversal (indicated as 1) in third tier cortex resulting from the injection series, whereas the multiple-areas models predict two label reversals (indicated as 1 and 2). (E) A series of tracer injections across the width of upper field DM, starting caudally with an injection straddling the border between dorsal V2 and DM, and ending near the rostral border of DM. All injections are in upper field cortex and, therefore, are expected to produce label in upper field V1 and V2; however, the caudalmost injection (light blue), which straddles into adjacent V2, is expected to also produce label at the lower horizontal meridian representations of V1 and V2. Black arrows point at an injection site that straddles the caudal border of upper field DM, as well as to the label at the horizontal meridian representations in V1 and V2 resulting from this injection.