Figure 8. Joint distribution of spectrotemporal tuning and its relationship with anatomical subregions in field L. A, Joint distribution of spectral and temporal tuning widths for all sites. Each dot corresponds to a recording site (n = 525). The histograms along the edges show the distribution of temporal widths (top) or spectral widths (right). B–D, Joint distributions for individual subregions (B, L2; C, L3; D, L1). In the scatter plots and histograms, the mediolateral divisions are denoted with three colors (red, green, and blue). For each field L layer, two typical example STRFs are shown, and their location in the joint plot is indicated by a black square and a triangle. B, In L2, all sites are lined up along the spectral axis, indicating tight temporal tuning. Note the mediolateral shift in spectral tuning both in the scatter plot and the histograms. C, In L3, most of the sites lie along the temporal axis, indicating narrow spectral tuning with a broad range of temporal tuning. Note the mediolateral shift in spectral tuning in the scatter plot and the histograms. D, In L1, a mixture of L2-like and L3-like tuning was found. The smaller number of sites in L1 reflects its relatively narrow anatomical extent.