Figure 5 in Binocular Encoding in the Damselfly Pre-motor Target Tracking System

Figure 5. Demoiselle TSDNs Are All Binocular, with Differing Thresholds and Input Weights TSDNs were mapped under binocular (equivalent to Figure 2) and monocular conditions (left and right eye patches, in random order), followed by another binocular map as a control. Monocular responses were categorized into three types (types 1–3, A–C, respectively), according to the binocular interaction observed. For each response type, row 1 is representative direction receptive field map from a single cell (example), row 2 is average spike-triggered map from cells falling within the category, row 3 is relative response densities (STAs projected onto the horizontal axis; mean ± SD for each cell recording), row 4 is left versus right hemifield relative response cumulative sum, and row 5 is proposed summation-to-threshold model that could generate the responses. Full data are given in Figure S5B. Direction map color-coordinated system indicated by the colorwheel. Spike triggered average maps are color-coded as relative spike rates between 0–1, as indicated by the scale bar. (A) Type 1: binocular only, in which visual responses are dependent on both eyes in an all-or-none fashion. n = 3 cells allocated to this category. (B) Type 2: balanced split-monocular, in which receptive fields are bisected along the midline with absent responses from the hemifield ipsilateral to the eyepatch and reduced responses, but still present, in the contralateral hemifield (arising from non-occluded eye). n = 4 cells allocated to this category. yFor 1 cell, the right eye hemifield of this second control had an unusually high relative response. This hemifield was noted as an outlier, possibly caused by electrode or animal movement, and excluded from mean/variance calculation. (C) Type 3: ocular dominant, in which occlusion of one eye fully suppresses the entire receptive field. However, occlusion of the adjacent eye bisects the receptive field at the midline with responses found only in the non-occluded hemifield. n = 5 cells allocated to this category. yyOne type 3 cell is missing the uncovered positive control due to deterioration of recording signal (see Figure S5B).