In Eppler's (1995) study, all 5-month-old infants looked to the monitor with matching visual social information (i.e., when they heard a woman talking from the central monitor, they looked at the monitor showing a woman talking; when they heard clapping from the central monitor, they looked at the display of a woman playing a clapping game). However, only infants with good object manipulation skills looked to the monitor with matching object information (i.e., when they heard rattling or clanking from the central monitor, they looked at the display of marbles in a jar or spoon hit against a bowl). Eppler's dependent measure relies on which method? How would Eppler infer that infants have intermodal perception (i.e., can match sight and sound)? In Epper's study, the Independent variables are: Social events and object events 5-month-old infants O Intermodal perception Mothers and their infants