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. 2003 Aug 6;23(18):7194–7206. doi: 10.1523/JNEUROSCI.23-18-07194.2003

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Copyright © 2003 Society for Neuroscience 0270-6474/03/237194-13.00/0

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Figure 7. — Quantification of WF similarity across mean level. A-C, Pairwise normalized inner product matrices for the WFs shown in Figure 6. For each unit, the normalized distances between pairs of weighting vectors at different mean levels reveal similarity in RSS-derived tuning within the dynamic range of the unit. Normalized inner products are mapped to circle size with shading marking multiples of control distribution SD: 0.18. These matrices are symmetric with diagonals of 1, and only the lower diagonal portions are shown. D, Distribution of all pairwise comparisons for all 52 units studied at different mean RSS levels. Dissimilarity of this distribution compared with the same number of randomly oriented vectors (E) indicates that RSS-derived WFs mostly maintain their shape across mean level to within a scale factor.