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Fig. 5. (A) The number of significant (|Z|>2) pixels
within `same' surfaces is plotted on the y axis against the
corresponding measure for `different' surfaces on the x axis, for
each tested pair of patches. (B) We computed the correlation between all
possible pairs of `same' surfaces within the V1 (solid circles) and H1 (open
circles) population separately (pairwise correlation), plotted on the
y axis against the same measure for `different' surfaces on the
x axis. (C) The modulation on `same' surfaces at the positions
indicated by white triangles (negative diagonal) in
Fig. 6D is plotted on the
y axis (averaged between the two positions) against the modulation at
the positions indicated by black triangles (positive diagonal) in units of
impulses s–1. (D) We computed the Fourier power spectrum for
each surface individually, and extracted power at four different orientations:
horizontal, vertical and the two diagonals. Power oriented along the negative
diagonal is plotted on the y axis against power along the positive
diagonal on the x axis, for `same' (solid symbols) and `different'
(open symbols) surfaces. Units are arbitrary. Power along horizontal and
vertical orientations was similar to power oriented along the positive
diagonal. In A,C,D: 
, V1; 
, H1; 
, V2;
, H3. +ve, positive; –ve, negative.
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