The Journal of Neuroscience, December 20, 2006, ():
Two Retinotopic Visual Areas in Human Lateral Occipital Cortex
J. Neurosci. Larsson and Heeger
26: 13128
Supplemental Data
Files in this Data Supplement:
- supplemental material
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Supplementary Figure 1. Polar angle component of retinotopic maps (right
hemispheres). Cortical representation of visual polar angle displayed on
computationally unfolded and flattened patches ("flat maps") of the right
hemisphere occipital cortex of all 15 individual subjects. Color indicates
polar angle (see Fig. 1 legend) of voxels with response coherence>0.25
(see Methods). Solid white lines indicate the boundaries between areas V1,
V2v/d, V3v/d, hV4, V3A/B, LO1, and LO2, identified by the automated atlas fitting procedure (see Methods). Black contours indicate borders of
functionally defined area V5/MT+, identified in a subset of subjects.
Although the maps from each hemisphere differ from one another in detail,
the same pattern of reversals at the horizontal and vertical meridian
representations is evident in the majority of the hemispheres. In the 8
hemispheres indicated by two asterisks (**) (S1, S3, S4, S5, S8, S9, S13,
and S15), the visual field representations in LO1 and LO2 corresponded to
full hemifields. In the 5 hemispheres indicated by a single asterisk (*)
(S6, S7, S10, S11, and S12), the visual field representations in these
areas were closer to quadrants. In the remaining right hemispheres, the
visual topography of LO1 and/or LO2 was too indistinct to infer the extent
of visual field coverage.
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Supplementary Figure 2. Radial component of retinotopic maps (right
hemispheres). Cortical representation of visual eccentricity for the same
hemispheres shown in supplementary Fig. 1. Details as in supplementary
Fig. 1, except colors indicate eccentricity between 0-6 deg (see Fig. 1
legend).
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Supplementary Figure 3. Polar angle component of retinotopic maps (left
hemispheres). Same format as supplementary Fig. 1. Full hemifields in LO1
and LO2 were evident in the 6 hemispheres indicated by two asterisks (**)
(S1, S2, S5, S8, S9, S15). In 4 hemispheres, indicated by a single
asterisk (*), (S3, S4, S6, and S7), the visual field representations in
these areas were closer to quadrants. In the remaining left hemispheres,
the visual topography of LO1 and/or LO2 was too indistinct to infer the
extent of visual field coverage.
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Supplementary Figure 4. Radial component of retinotopic maps (left
hemispheres). Same format as supplementary Fig. 2.
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Supplementary Figure 5. Atlas fitting procedure. A. Atlas polar angle
template for V1, V2v/d, V3v/d, hV4, LO1, and LO2 in atlas space (atlas
templates for V3A/B not shown). Black lines, boundaries between visual
areas. Color indicates polar angle (same scale as Fig. 8B). Maroon symbols
(arrows and asterisk) indicate corresponding points in panels A-F. Note
that part of the posterior boundary of the V3A/B template maps corresponds
to the bifurcating vertical meridian representation extending from the
anterior boundary of V3d. Because of this, the template maps for V3A/B do
not directly adjoin the template maps of LO1/LO2, resulting in an apparent
cut in the template maps between these areas. B. Atlas eccentricity
templates for V1, V2v/d, V3v/d, hV4, LO1, and LO2 in atlas space. Color
indicates eccentricity between 1-6 degrees (same scale as Fig. 8A). C.
Atlas polar angle templates for V1, V2v/d, V3v/d, hV4, V3A/B, LO1, and LO2 coarsely aligned to right hemisphere data of subject S1. Color scale as in A. D. Atlas eccentricity templates for V1, V2v/d, V3v/d, hV4, LO1, and LO2 coarsely aligned to right hemisphere data of subject S1. Note that no
eccentricity template was used for V3A/B. Color scale as in B. E. Atlas
polar angle templates elastically deformed to right hemisphere data of
subject S1. Black lines show fitted area boundaries. Color scale as in A.
F. Atlas eccentricity templates elastically deformed to right hemisphere
data of subject S1. Black lines show fitted area boundaries. Color scale
as in B.
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Supplementary Figure 6. Root mean square (RMS) errors of the atlas fits
for each visual area. Blue bars, full hemifield model. Red, quadrant
model. Note that predictions of the quadrant and hemifield models differ
only in LO1 and LO2, hence the other visual areas are represented by gray
bars. Asterisk indicates significant difference (paired t-test, d.f.=29,
P<0.01) between the two model fits. Error bars, standard error of the mean
across 30 hemispheres.
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Supplementary Figure 7. Correlation between visual area size and range of
polar angle representation in LO1 (left panel) and LO2 (right panel)
across hemispheres. Abscissa, surface area (mm2) estimated by atlas
fitting procedure (see Methods for details). Ordinate, range of polar
angles represented within each area, calculated from the mean transect
plots in Fig. 8. Lines, least squares fits to the data. If the spatial
blurring due to the small size of LO1 and/or LO2 were responsible for
reduced range of polar angles in these areas, relative to a full
hemifield, one would expect a positive correlation between area size and
the range of polar angle representation within each area. For LO1, the
correlation was highly significant (R=0.62, P<0.001). For LO2 the
correlation showed only a non-significant trend (R=0.32, P<0.1), although
the correlation reached significance (R=0.38, p<0.05) after removal of the
two most outlying hemispheres (indicated in red). Note that if LO1 and
LO2 each contained only a quadrant representation, then this relationship
between area size and polar angle range should hold only for polar angle
ranges smaller than a quadrant. The figure shows, however, that the
relationship holds over a much larger range. These results are thus
consistent with full hemifield, not quadrant, representations in LO1 and
LO2.
