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A general model for an adaptive neural encoder relating the output firing frequency to input stimulus is presented. The model is based on an "integrate and fire at threshold" scheme and includes cumulative inhibitory feedback as well as output rate dependent threshold control.
A number of agents can arrange themselves equidistantly in a row via a sequence of adjustments , based on a simple \local" interaction. The convergence of the connguration to the desired one is exponentially fast. A similarity is shown between this phenomenon and the dynamics of pulse propagation along a distributed RC line, and a conjecture is made… (More)
We consider a deterministic continuous pursuit, in which n ants chase each other in cyclic order and with preassigned, varying speeds. We also consider two discrete analogs, in which crickets or frogs are engaged in cyclic pursuit with constant and equal speeds. We examine the possible evolutions of these pursuits as time goes to innnity: collision, limit… (More)
We recently realized that the Marr-Hildreth edges, computed as the zero crossings of the image Laplacian, can be viewed as optimal edge integration curves solving a geometric variational problem. We used this observation to derive a new set of edge integration and object seg-mentation procedures. Here we show that the edge detectors proposed by Haralick,… (More)
An adaptive version of the integrate and fire-at-threshold model for the neural coding process is presented. The encoder transforms stimulus intensity information into sequences of identical membrane depolarization spikes, their times of occurrence defining a modulated point process. Several theoretical decoding schemes are then introduced and their… (More)
Methods of analysis for some deterministic and stochastic variants of the integrate-to-threshold neural coding scheme are presented. Adaptation phenomena are modeled by means of feedforward and feedback adaptive threshold control. Simulations of sinusoidal and step responses reproduce satisfactorily the qualitative characteristics of adaptation as compared… (More)
Fig. 13. A British WWII Supermarine Spitfire fighter plane featuring a dangerous fiducial. A set of C concentric circles with r1 = 1+1=2C 2 and 1r = 1+1=2C is expected to be a very good (although suboptimal) location shape. Experimental tests in  and further theoretical developments recently published in , led to the conclusion that the " bull's-eye… (More)