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Flat Maps
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Since the distances cannot be matched perfectly, some distortions are introduced in the un-
folding process. To improve the precision, only a region of interest rather than an entire hemi-
sphere is sometimes flattened.
Once the unfolding process has finished, the former folded sheet, which spanned several
image planes, can be viewed in a single image (Figure 9). It is possible to overlay functional
data onto anatomical data (explained in the following sections). This provides a good over-
view of the organization across the cortical surface. Section 3.8 explains different types of flat
maps in more detail.
For further information on flat maps and their creation, please refer to [Wandell, 1999
#16] [Teo, et al., 1997 #8] [Wandell, et al., 2000 #38] [Floater, 1997 #39].
Figure 8: Nodes and Delaunay triangulation
Initial planar positions of the nodes with Delaunay triangulation (a) and positions
of the nodes after adjusting the node positions (b) to match distances between two
corresponding nodes in the plane and in three-space better; Source: [Wandell, et
al., 2000 #38]
(a)
(b)
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