A group of 30 institutionalized "predelinquent" preadolescents and 30 public school nondelinquent preadolescents were compared on Kagan's Matching Familiar Figures Test (MFF) of cognitive impulsivity. Contrary to predictions, predelinquents were more reflective than nondelinquents on both the latency and error dimensions of the MFF.…

The relationship between cognitive tempo and time estimation as measured by reproduction and production was investigated in boys. Impulsives underestimated time intervals more than reflectives when measured reproductively. Impulsive boys' response times were significantly correlated with their estimates of reproduction times. The physiological…

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…