Effects of orientation on amodal completion: primed-matching paradigm F. Sgorbissa, C. Fantoni, W. Gerbino To further demonstrate that orientation affects amodal completion (Srebotnjak 1984; Sekuler 1993; Sgorbissa & Gerbino 1999) we used a primed-matching paradigm with variable-duration primes (50, 400, 1000 ms). At long prime durations one region of the prime could be perceived as an amodally completed fish-like shape. According to the field model of visual interpolation (Gerbino & Fantoni, 2000), a fish-like shape is perceived only when orientation along the cardinal axes supports the good continuation of amodally completed contours. Matching stimuli were fishes and crosses displayed in two orientations, always consistent with the orientation of the prime. Orientation modulated priming only at long prime durations. As predicted by the field model of visual interpolation, good continuation was more effective when T-junction stems were collinear with cardinal axes.