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A, D, Progression of receptive fields of LGN neurons sampled during vertical electrode penetrations in the late-life group. The format is the same as in Figure 4. Locations of the recording sites are indicated in panels C (case WG3) and F, G (case WG4). For WG3, the most lateral penetration (α-θ) was in a section plane 0.16 mm caudal to the one for the other two penetrations. For WG4, the sections illustrated in F and G were 0.48 mm apart (F was more caudal).
