Narrowing wide-field optic flow.

<p>Cerebral activation related to the transition from wide to narrow optic flow (FtN) contrasted to narrowing of a stationary dot field (StN) in healthy controls (HC) is displayed in a glass brain view (A). Responses of the single significant cluster (max x −16, y −6, z 60) are shown for HC and the entire Parkinson’s disease (PD) group (B). Threshold is set at <i>p</i> = 0.001 uncorrected with an extended voxel threshold (k) of eight voxels. CI = confidence interval; FW = wide optic flow; FtS = gradual transition to stop wide optic flow; SW = wide stationary dot field. R = right side of the brain.