RD_2Gabor

iModel

RD_2Gabor_Rect
1/2 Reichardt Detector from Rectified Inputs

Summary

This model differs from RD_2Gabor by having a half-wave rectification stage following each Gabor filter. The rectified outputs of the two Gabor filters is then multiplied after the even channel is delay. This is a non-opponent model, and thus only 1/2 of a typical Reichardt detector.

Results

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References

Reichardt W (1957) Autokorrelationsauswertung als Funktionsprinzip des Zentralnervensystems. Zeitschrift für Naturforschung, Teil B. 12:447--457.
Reichardt W (1961) Autocorrelation, a principle for the evaluation of sensory information by the central nervous system. In: Sensory Communication, Rosenblith WA, ed. pp 303--317. MIT Press, Cambridge, MA.

The visual stimulus is processed by two linear Gabor filters (even and odd) that are in quadrature. The filters have a separable temporal profile (not shown) that consists of a biphasic temporal function built from the difference of two Maxwell distribution functions. The outputs from each filter is half-wave rectified and the output from the even filter is delayed. The signals are then multiplied. The final output is scaled, half-wave rectified, and used to generate Poisson spikes.