05 FWE corrected (see Figure 4 for three representative subjects; Figure S3 shows remaining subjects).
Mean peak coordinates of the clusters were right 22, −90, 21, and left −17, −93, 21. Note that when thresholds were dropped below the stringent FWE correction, activity of this contrast filled V3A, indicating a preference to objective over retinal motion throughout its retinotopic representation. This contrast thus constitutes a new, robust, and highly reliable simple V3A functional localizer. Although the contrasts for objective motion, for retinal motion, and for their difference were matched in pursuit content, we wanted to test whether the observed effects were affected by suboptimally stimulated foveal or peripheral representations. The fovea contained the fixation disc, and the periphery was affected by pursuit-induced motion of the screen edges. Pursuit extended up to 2.5 visual degrees eccentricity; the screen edge was click here at 12°. During the brief periods of furthest eccentricity of the fixation, optimal visual stimulation was provided within 9.5° and 14.5° eccentricity in the two hemispheres, respectively. We subdivided each V3A ROI into three subdivisions, representing selleck chemical eccentricities of 0°–3.1°, 3.1°–6.1°, and 6.1°–12°, as shown in Figure 5A. Figure 5B shows that each eccentricity representation of V3A showed a significant
preference for objective motion, with the strongest effect in the middle eccentricity that was optimally stimulated at all times. Hence, our results were robust, and only minimally affected by effects surrounding the fixation disc or by the brief periods of suboptimal stimulation in peripheral representations. too The preference for head-centered over eye-centered planar motion, therefore, extended throughout the full retinotopic representation of V3A. We next examined whether the capability of V3A and V6 to respond to objective planar motion and to compensate for pursuit-induced planar retinal motion was preserved when expansion/contraction flow of a simulated 3D dot cloud was added to all four conditions of the dot-field stimuli. The experimental conditions and manipulations were the same as in experiment
2, but the added 3D flow would require different or more complex neural computations in order to compare the planar retinal motion component of the complex stimulus with nonretinal planar motion signals. The stimuli now contained the same left-right planar motion as in experiment 2 but with additional simulated forward/backward motion as illustrated in Figure 6A. The point-of-expansion was locked to planar objective motion, moving only in (−/+) and (+/+) conditions. Figures 6B and 6C show that V3A lost its ability to respond to the objective planar motion component in the stimuli; it was not significantly modulated by either, objective or retinal planar motion components, with no difference between the two. In contrast, V6 maintained a marginally significant response to objective planar motion [t(11) = 2.
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