Dendritic Pooling of Noisy Threshold Processes Can Explain Many Properties of a Collision-Sensitive Visual Neuron
Fig 6
Prediction of LGMD responses by n-ψ.
(a)The figure shows the data from figure 3 of reference [17] (locust), where looming dark squares were used for stimulation (tc = 0.5s: vertical red line). The η-function and n-ψ perfectly match these data. More examples are shown in Section D.5 in S1 Text. (b)DCMD spike trace in response to an approaching black square (tc = 5s, l/∣v∣ = 30ms, ref. [29]) directed to the eye center of a gregarious locust (final visual angle 50o). Data show the first stimulation so habituation is minimal. The spike trace (sampled at 104Hz) was full wave rectified, lowpass filtered, and sub-sampled to 1ms resolution. Firing rate was estimated with Savitzky-Golay filtering (“sgolay”), and fit by the η-function and n-ψ, respectively. Both functions fit the firing rate estimates very nicely. More details and further examples are provided in Section D.6 in S1 Text.