Response of the output units in a 20-by-10 network trained using the SOM to form a tonotopic map. The 20,broadly tuned input units provide a distributed encoding of the frequency of stimulated sounds(as shown for two frequencies within the range in Figure 5.10). The responses of each of the 10 output units to this input at every test frequency are plotted in two-dimensions with overlain curves(A), One for each output unit, or with curves that are spread out in a three-dimensional contour plot(B).
Anastasio, Thomas J. Tutorial on Neural Systems Modeling. Sunderland: Sinauer Associates, 2010. Print.
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