This study examines two questions: (1) are the natural environmental contingencies under which reflective and impulsive children operate different? and (2) if so, which, if any of these differences, predict the nature of behavior change? Forty impulsive and reflective children and their mothers were observed while solving discrimination problems…

Four studies were conducted to examine the manner in which cognitively impulsive and reflective children use private speech to control their behaviors. The first study was a naturalistic observation of a group of impulsive (N=8) and reflective (N=8) nursery school children, identified by the Matching Familiar Figures Test. The Impulsive and…

This study investigated whether the stimulant methylphenidate (Ritalin) would differentially affect performance on a test of cognitive style by hyperactive children. Subjects were 55 children, (ages 7 to 15) referred to the Learning Clinic at the Hospital for Sick Children, Toronto, Canada for hyperactivity and/or learning problems. A paired…