The name is absent



33

together discrete activation foci (S2+, STS, MST, and LOC) into a single large patch of
activation. The second largest area of activation was observed dorsally, in primary
somatosensory cortex (Sl) and adjacent areas, especially in a region in the postcentral
sulcus. On the medial wall of the hemisphere, tactile responses were found in the
supplementary motor area (Lim, et al. 1994) and posteriorly in the medial portion of SI.

Figure 5. Group map of cortical tactile activations with spatial smoothing (8mmfull-width half-
maximum Gaussian kernel). A, Lateral view of left hemisphere. B, Medial view of left hemisphere. C,
Superior view of both hemispheres. D, Lateral view of right hemisphere. E, Medial view of right
hemisphere. Outline shows selected regions. SMA1 Supplementary motor area, located in the medial
superior frontal cortex. Light green dashed line shows the fundus of the central sulcus, and dark
green dashed line shows the fundus of the postcentral sulcus.

Table 1. Clustered-node analysis of the group average surface activation map shown in Figure 5

Area
(mm2∣

Mean t
statistic

Maximum t
statistic

Coordinates c
peak activity

>f Location of
peak activity______________

Left hemisphere

Lateral occipital-temporal-parietal

4545

4.9

18.2

(-54,-49,14)

Posterior superior temporal sulcus

Postcentral gyrus

1834.25

4.4

8.7

(-15,-51,-59)

Postcentral gyrus and sulcus

Right hemisphere

Lateral occipital-temporal-parietal

2908

4.8

12.7

(40,-69,-2)

Lateral occipital (MST)

Postcentral gyrus

1588

4.7

17.5

(21,-52,65)

Postcentral gyrus



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