From skylight input to behavioural output: A computational model of the insect polarised light compass
Fig 5
The gating function that compensates for tilt.
The differing weightings of ommatidia input under three levels of tilt [(A) δ = 0° (θt = 90°), (B) δ = 30° (θt = 60°) and (C) δ = 60° (θt = 30°)] are shown, with darker shading indicating higher weighting. The inner dashed black circle delineates the actual receptive field of the simulated sensor (28° radius, equivalent to ω = 56° receptive field). The extended array (greyed out units) illustrates how this weighting adheres to a Gaussian function defined on the sky dome. The blue circle shows the dominant focus of the sensor (θg = 40°), and the green arrow shows the smoothing parameter (σg = 13°).