Click on the image to see a PDF version (for zooming in)

Fig. 7.7. Components of the tilt aftereffect due to each weight type. The solid line represents the magnitude of the TAE for a single trial from Figure 7.5. This trial was at the center of the retina, and is typical of the effect seen at the other 15 locations. The other curves illustrate the contribution from each different weight type separately. Other than the learning rates for these weights, the parameters were identical in each case. The line with short dashes represents the contribution from the afferent weights (&alpha_A = 0.000005; &alpha_E = &alpha_I = 0). This contribution is minor and in the direction opposite to the overall TAE curve. The dotted line represents the contribution from the lateral excitatory weights (&alpha_E = 0.000005; &alpha_A = &alpha_I = 0). It is in the same direction as that of the afferent weights, but so small it can hardly be seen (the x axis is not shown because it would have covered up this line). The line with long dashes represents the inhibitory contribution (&alpha_I = 0.000005; &alpha_A = &alpha_E = 0). These weights clearly determine the shape of the overall curve, although it is slightly reduced in magnitude by the afferent contribution.