Fig. 1 | Nature Communications

Fig. 1

From: A neuronal correlate of insect stereopsis

Fig. 1

Experimental setup and disparity-sensitive TAOpro-neuron. a Praying mantis watches computer screen showing disc stimulus during neuronal recording (side view, top view). Spectral filters ensure each eye sees only one disc; lines of sight in blue (green) for left (right) eye. Virtual disc floats in front of screen (red line). b Mantis brain with major neuropils. Inset 3D-reconstruction of lobula complex (LOX), site of ramifications of all except one neuron type presented in this study. AL antennal lobe, ALO-D dorsal unit of the anterior lobe, ALO-V ventral unit of anterior lobe, CX central complex, LA lamina, MB mushroom bodies, ME medulla, OLO1/2 outer lobe 1/2, SLO stalk lobe. c Reconstruction of TAOpro-neuron (tangential projection neuron of the anterior and outer lobes) showing ramifications in LOX and central brain. Inset: left brain, colour shows LOX sub-compartments containing ramifications. d Disc trajectory. Red dots: disc centre at 60 Hz refresh rate. e TAOpro-neuron responses to disc stimulus. Sketches indicate stimulus disparity. Upper lanes: vertical (blue) and horizontal (red) distance of disc from screen centre; negative values are left and lower side of screen. Middle lanes raster plots, lower lanes spiking rates (average red line, ±1SEM) after Gaussian smoothing (SD 150 ms). Right plot: virtual disc at 25 mm (in catch range), left: control (right and left eye disc swapped). f Bar stimulus configuration with all 6 different bar positions on computer screen in 100 mm distance to animal (shown alternating dark/bright red for clarity; right panel zoom) and virtual bars (see also Supplementary Fig. 1 for further explanation). Azimuthal direction of simulated bars from mantis head midline in olive and distance isolines in grey. g Monocular and binocular responses to bar stimulus. Binocular responses as pseudocolour 2D-plot and monocular responses (averages ±1SEM; blue line background activity) as 1D-plots at left and bottom margins for respective eye. Axes show centre of bar shown to left and right eye, respectively. Binocular response is interpolated (raw plot in Supplementary Fig. 2). Isolines indicate azimuth (olive) and distance (grey) from mantis as shown in f. Dashed line marks screen locations implying objects at “infinity” (parallel lines of sight)

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