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When driving, flying and even when walking one often can see motion-produced blur patterns that are caused by images of textures slipping over the retina and leaving trails of residual afterimages behind them which contain their motion histories. Other studies in this series on blur pattern parameters have shown that human observers can sensitively detect directional information within a blur pattern, for example when there is curvature change, or relative divergence of the individual blur lines. The purpose of this study was to determine whether the detection of blur pattern curvature change, studied in a previous experiment, would be enhanced if stationary reference lines were superimposed on the blur pattern. Reference lines were oriented in three ways, parallel, perpendicular, and at 45 deg to the direction of element flow. Patterns were viewed foveally or with peripheral vision.