RD_2Gabor

iModel

RD_2Gabor
1/2 Reichardt Detector from Two Gabor Filters

Summary

This model is inspired by the Reichardt Detector (RD). It consists of the product of the outputs of two linear Gabor filters that are in quadrature phase. The signal from the even Gabor filter is delayed before the multiplication. This is a non-opponent model, and thus only 1/2 of a typical Reichardt detector.

Results

Please get a Java compatible browser to see this.

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 output from the even filter is delayed and the signals are then multiplied. The final output is scaled, half-wave rectified, and used to generate Poisson spikes.