Oscar, a 4-month-old baby, is a participant of a preferentia…

Oscar, a 4-month-old baby, is a participant of a preferential-looking experiment. Researchers show Oscar two photographs: a photo of his mother and a photo of a female stranger. The photographs are presented repeatedly in differing locations, and the amount of time Oscar spends looking at the photographs is recorded. What will researchers conclude if Oscar shows a reliable preference for the photograph of his mother over that of the stranger?