A Model for an Angular Velocity-Tuned Motion Detector Accounting for Deviations in the Corridor-Centering Response of the Bee
Fig 2
The two versions of the AVDU detector. Left: with dynamic time constants; right: with delays.
Squares indicate LIN units, circles indicate other operations. In the centre we suggest the corresponding regions of the bee visual system for each stage of the detector. In both versions the input is first temporally filtered in the input layer (first square), then is transmitted to two Reichardt-Hassenstein detectors (Fig 1). These either differ in the time constants of the LINs (τ1 and τ2) or by fixed delays (d1 and d2) shown with gray backgrounds. A base time constant of τb = 1ms is used otherwise. A further LIN is used to apply the subtraction, having a time constant of τR = 5ms, and then the division is performed in the final LIN following summation across all detectors in the array. This final LIN has a time constant of τS = 100ms to smooth the output.