Fig. 4.

Reproducibility of orientation preference maps. To test the reproducibility of the phase maps, the displayed orientations were presented through a CW (a) or CCW (b) rotation while an identical phase-encoding analysis was preformed. At a time point corresponding to a quarter of the cycle, voxels seeing a 45° stimulus during a CW rotation will see a 135° stimulus during a CCW rotation, as schematically illustrated in d. Thus, the CW and CCW phase maps should reflect a 180° shift (i.e., complementary maps). For qualitative demonstration, the CW and CCW phase maps (from subject 2) were binned into a 90° bandwidth (a and b, respectively); bright regions in the CW map were outlined (red) and superimposed on the CCW map. Bright regions in the CW map largely overlap with regions of dark colors in the CCW maps (b). Furthermore, good reproducibility is seen with maps acquired on different days (c). (Scale bar: 0.5 mm.)