Figure 1.
Grand averaged waveforms of the VEPs in each of the four quadrants for relevant sensor which location is indicated on the head representation.
a) Response to slow motion stimuli. b) Response to fast motion stimuli.
Figure 2.
Spline-interpolated 3D voltage maps of the VEP components found in the grand averaged waveforms in the four quadrants.
a) Slow motion stimuli. b) for fast motion stimuli.
Figure 3.
Coregistration of the VEP/fMRI responses to slow motion stimuli.
a) Group-averaged contralateral fMRI activations superimposed on the flattened hemisphere (occipital lobe) of the PALS template. The pseudocolor scale indicates the statistical significance of the fMRI activations. Major sulci (dark gray) are labeled as follows: parieto-occipital sulcus (POS), intraparietal sulcus (IPS), posterior intraparietal sulcus (pIPS), superior temporal sulcus (STS), middle temporal sulcus (MTS), inferior temporal sulcus (ITS), lateral occipital region (LOR), fusiform gyrus (fusiform) and calcarine fissure (Calcarine). The dashed outline surrounding area MT+ represents the group-averaged location of the motion-sensitive cortex based on separate localizer scans. b) Schematic representation of the source locations in the unseeded dipole model. c) Source waveforms of the dipoles seeded to the fMRI activations.
Figure 4.
Coregistration of the VEP/fMRI responses to fast motion stimuli.
For other detail, see the caption for Figure 3.
Figure 5.
Group fMRI activations for slow and fast motion stimuli rendered on the semi-inflated cortical surface reconstruction of the left hemisphere of the average brain (left section).
Results are also shown in a close-up view of the posterior part of the brain rendered on a flat map. Results from upper and lower hemifields are collapsed together. Activations for slow and fast motion conditions are plotted in different colors to represent their topographic specificity. Labels and insets are the same as those in Figure 3.
Table 1.
Talairach coordinates of the significant activations in the averaged fMRI data from thirteen subjects.
Table 2.
Talairach coordinates of the unseeded source models based on VEP data only.
Figure 6.
Individual fMRI activations projected onto the flattened left and right hemispheres of a representative subject.
Activations in response to contralateral stimuli in each quadrant are shown in relation to the boundaries of visual areas, defined in the same subject by retinotopic mapping and consequent calculation of the visual field sign as well as by MT+ and V6 mapping. As indicated in the semicircular logos, dashed and solid lines correspond to vertical and horizontal meridians, respectively; the plus and minus symbols refer to upper and lower visual fields representations, respectively. Other labels and logos are the same as those described in Figure 5.