Bernal S D_2010.pdf - University of Plymouth

5.2. FEEDBACK-MEDIATED ILLUSORY CONTOUR COMPLETION
0.798
0.296
Mean ab! error 0.Z94
between CI square
reconstructiiin using
0 297
S1-C2 weichi matrix
and (hi- ideal C'l quare
I I
029-
a.78B
0 286
Q2M^
S 10 1S 20 25 30 35
Number uf nun-zero dcmenls In the S2-C2 vtt\^M matrix
Figure 5.2.^: Comparison beiween the feedback generated by a square representation in the
C2 layer as a luticlion of the number i>l' non-zero elemenl.s (x-axis) in the S2-C2
weight matrix and the sampling parameters Ncj and K^i (different line graphs
as shown in lipure legend). The C2 represeniafion was obtained ufiing an S2-C2
weight malrix with one non-zero element. The y-axis corresponds to the mean
square difference bt'tween the C1 reeiinslruelion using the differcnl S2-C2 weight
matrices and [he ideal C1 square representation Ibr all nodes ol CI, scale baiid I.
The CI reconstruction, ;r(CI), is obtained exclusively from the 7t(52) response,
such that no feedforward likelihood function is involved, using the fixed sampling
parameters Nc\ 4 and Ki\ = 4. The ideal CI square represenlalion is shown
underneath the y-axis label. Three i)f the CI reconstructions from S2-C2 weight
matrices with different paramelers are also shown to visually illustrate that lower
error values generally correspond Ui CI reconstructions closer to the ideal CI
square.
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