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Spatial response tuning averaged from five STMD neurons in the dragonfly H. tau, to targets with different Weber contrast. All targets had an angular width of 1.0° and were drifted through the receptive field at 45° s−1. Although roll-off for large targets reflects neural inhibitory mechanisms, the dependency of roll-off at smaller sizes on target contrast is predicted by optical blur in the photoreceptors (see text).
