Figure 6. Signatures of stimulus competition at simultaneously recorded, aligned Imc and OTid sites. A, Schematic of experimental setup for simultaneous, paired recordings in Imc and OTid. S1 and S2, Stimulus protocol for measuring competitor response profiles; colored icons to the left, recording electrodes, positioned in OTid (blue) and Imc (red); dashed ovals, RFs of recorded site. B, Raster plots of responses for example paired, aligned Imc (left panels) and OTid (right panels) sites; distance between RF centers = 8° (Materials and Methods). Top panels, Responses to S1 alone. Bottom panels, Responses to S1 and S2 presented together. Strength of S1 = 9.6°/s. All other conventions similar to Figure 1B. C, Firing rate responses corresponding to rasters in B. Conventions are as in Figure 1C. Competitor response profile correlation values: Imc = −0.81, (p = 0.009); OTid = −0.99, p < 0.05 (p = 0.0000004). Competitor response profile transition ranges: Imc = 2.8°/s (switch-like competitor response profile); OTid = 15.3°/s (gradual competitor response profile). Competitor response profile transition values: Imc = 4.1°/s; OTid = 6.2°/s. D, Scatter plot of competitor response profile biases measured at paired Imc and OTid sites (n = 17 pairs; average distance between RF centers = 6.3 ° ± 0.95 °). Dashed gray line, line of equality; solid purple line, best fit line to data; Pearson's ρ = 0.6, p = 0.01. E, Scatter plot of transition ranges of competitor response profiles measured at paired Imc and OTid sites. Dashed gray lines, cutoff value of transition ranges (4 °/s) for switch-like versus gradual competitor response profiles. F, Plot of difference in transition ranges of competitor response profiles (OTid − Imc; top) or biases of competitor response profile (OTid − Imc; bottom) for paired Imc-OTid sites as a function of distance between Imc and OTid RFs. Pearson's ρ = 0.03, p = 0.9 (competitor response profile transition ranges); ρ = 0.07, p = 0.8 (competitor response profile biases). G, I, Response time courses for OTid (G; blue) and Imc sites (I; red) recorded simultaneously; shown are the pooled averages across OTid sites, and separately, across Imc sites (conventions are as in Fig. 2). H, J, Results from the millisecond-by-millisecond AVOVA are also shown for OTid (H; blue) and Imc sites (J; red), respectively. Columns, Relative strength bins; IFR, instantaneous firing rate. Horizontal dashed lines, p value cutoffs (0.05, bottom line; 0.01, top line); vertical dashed arrows (and colored text), time to suppression; Materials and Methods). K, Scatter plot of time to suppression measured at aligned Imc versus OTid sites recorded simultaneously. Each dot, time to suppression pair for a different relative strength bin; data correspond to the colored numbers in G and I. Dashed line: line of equality. Pearson's ρ = 0.99, p = 0.0007.