Fig. 5.

Transmission of spatiotemporal patterns in a network in which the layers are connected with a center-surround connectivity profile. A moving current injected in 20 neurons of the input layer. The activity of the input layer (a) and the response in the fifth layer (b). The synaptic strengths are modeled with a difference of Gaussians connectivity profile (excitatory profile, SD 15 times the distance between neurons; inhibitory profile, twice as wide). PSTH bins averaged over 25 msec and 10 neurons. c, Read out of the stimulus position in the input layer (top curve) and layer 5 (bottom curve). The response is collected in 2 msec bins, and the stimulus location is determined by reading out the population code with a maximum likelihood estimator.