Figure 6 in Binocular Encoding in the Damselfly Pre-motor Target Tracking System

Figure 6. Demoiselle TSDN Receptive Fields under Opaque versus Translucent Eyepatches and Prisms (A) The effect of global intensity on the TSDNs responses was tested by mapping them with opaque (as in Figure 2) and translucent eye patches (noted with letters O and T; see also Figures S6A and S6B). All three types of response categories described in Figure 2 were also found in this experiment. Receptive fields were recorded in series (i.e., binocular uncovered, left/right opaque eyepatch,binocular uncovered, left/right translucent eyepatch,and binocular uncovered—the final binocular uncovered condition is excluded for presentation clarity). (B) A 4Ǫ and a 10Ǫ prism were used to test the TSDN responses under reduced binocular overlap between the two eyes (base out over left eye, producing deviation toward the left; Figure S6C). Reducing binocularity by 4Ǫ did not significantly affect spike density (two-sided sign test for matched pairs; p = 1.0; n = 9; blue traces), but a shift of 10Ǫ significantly lowered the spike densities compared to uncovered control (two-sided sign test for matched pairs; p = 0.0078; n = 8; see purple traces). No prism or prism over both eyes served as controls for the effect of the prism. Rows 1 and 3 show three example directional receptive fields at each prism deviation. White arrowheads mark the right-hand boundary of the receptive field. White ellipses indicate the left-hand boundary of the receptive field. Rows 2 and 4 are relative response densities (STAs projected onto the horizontal axis; mean ± individual traces from each recording; 4Ǫ n = 9 cells from 6 animals; 10Ǫ n = 8 cells from 7 animals). Row 5 shows A-relative response plots calculated by subtracting the first binocular uncovered response density (control) from each condition. B, binocular prism; L, monocular prism over left eye; U, uncovered; U', uncovered control. Full dataset for prism experiments is in Figure S6D.