( ( ( ( ( Chromatically-defined or ) unsigned ) contours ) ( in ( this stimulus ) ) ) ( ( ( ( provide ( ambiguous information ) ) ( for ( direction ( of motion ) ) ) ) ( since ( contours ( are ( displaced ( over ( ( equal distances ) ( in ( two ( opposing directions ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (ADJP (JJ Chromatically-defined) (CC or) (JJ unsigned)) (NNS contours)) (PP (IN in) (NP (DT this) (NN stimulus)))) (VP (VBP provide) (NP (JJ ambiguous) (NN information)) (PP (IN for) (NP (NP (NN direction)) (PP (IN of) (NP (NN motion))))) (SBAR (IN since) (S (NP (NNS contours)) (VP (VBP are) (VP (VBN displaced) (PP (IN over) (NP (NP (JJ equal) (NNS distances)) (PP (IN in) (NP (CD two) (JJ opposing) (NNS directions)))))))))) (. .)))
Chromatically-defined or unsigned contours in this stimulus provide ambiguous information for direction of motion since contours are displaced over equal distances in two opposing directions.
(ROOT (S (NP (NNP Distance)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (NP (DT the) (NN magnitude) (CC or) (NN size)) (PP (IN of) (NP (NP (NN displacement)) (PP (IN between) (NP (CD two) (NNS positions))))))))) (. .)))