After visit 1 , subjects were randomly assigned to 1 of 4 groups : ( 1 ) group A , control ( usual care ) ; ( 2 ) group B , treatment ( video peer modeling that involved watching a DVD recording of a typically developing child undergoing a dental visit ) ; ( 3 ) group C , treatment ( video goggles that involved watching a favorite movie during the dental visit using sunglass-style video eyewear ) ; and ( 4 ) group D , treatment ( video peer modeling plus video goggles ) .