noun. a type of forward masking wherein the understanding of an observable stimulant is changed by the previous presentation of another observable stimulant in a separate spatial locale. The mark is frequently a small dot, while the mask is a ring which encompasses it. Each stimulant appears very quickly, at intervals which are differentiated step-by-step, and the quality of the mark
PARACONTRAST: "The parcontrast concept confused the children and likely led to some of the discrepancies within the trial."