Bernal S D_2010.pdf - University of Plymouth

5.2. FEEDBACK MEDIATED ILLUSORY CONTOUR COMPLETION
5.2.3 Feedback from C2 to S2
Figure 5.23 compares the feedback generated by a square representalion in the C2 layer as
a function of the number of non-zero elements in the S2-C2 weighi matrix and the sampling
parameters Nc2 and Kci- In order to objectively compare the qualily of the feedback recon-
stniction, we calculate the mean absolute difference between the CI reconstruction, 7i{C\),
using the different S2-C2 weight matrices, and the ideal CI square representation.
Figure 5.23 tests the influence of two factors on the model's capacity to perform feedback re­
construction: 1) the number of non-zero elements in the S2-C2 weight matrix during (eedback,
and 2) the sampling parameters. In order to test the influence of ;i third factor, namely the
number of non-zero elements in the S2-C2 weight matrix used to generate the inilia) C2 square
representation, two different sets of results are shown. The C2 square representalion in Fig­
ure 5.23 was obtained using an S2-C2 weight matrix with one non-zero element, whereas the
C2 square representation in Figure 5,24 was obtained using an S2-C2 weighi matrix with two
non-zero elements.
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