In a study of infants using preferential looking, Wattam-Bell found that the maximum velocity for discriminating relative motion:

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Wattam-Bell's study on infants using preferential looking techniques found that the ability to discriminate relative motion, as measured by the maximum velocity at which this could be done, improved or rose between the ages of 10 and 13 weeks. This suggests developmental progress in visual perception abilities during this period.

In a Study of Infants Using Preferential Looking, Wattam-Bell Found