ObjectivesAnimal and human adult studies reveal a contribution of serotonin to behavior regulation. Whether these findings apply to children is unclear. The present study investigated serotonergic functioning in boys with a history of behavior regulation difficulties through a double-blind, acute tryptophan supplementation procedure.MethodParticipants were 23 boys (age 10 years) with a history of elevated physical aggression, recruited from a community sample. Eleven were given a chocolate milkshake supplemented with 500mg tryptophan, and 12 received a chocolate milkshake without tryptophan. Boys engaged in a competitive reaction time game against a fictitious opponent, which assessed response to provocation, impulsivity, perspective taking, and sharing. Impulsivity was further assessed through a Go/No-Go paradigm. A computerized emotion recognition task and a staged instrumental help incident were also administered.ResultsBoys, regardless of group, responded similarly to high provocation by the fictitious opponent. However, boys in the tryptophan group adjusted their level of responding optimally as a function of the level of provocation, whereas boys in the control group significantly decreased their level of responding towards the end of the competition. Boys in the tryptophan group tended to show greater perspective taking, tended to better distinguish facial expressions of fear and happiness, and tended to provide greater instrumental help to the experimenter.ConclusionsThe present study provides initial evidence for the feasibility of acute tryptophan supplementation in children and some effect of tryptophan supplementation on children's behaviors. Further studies are warranted to explore the potential impact of increased serotonergic functioning on boys' dominant and affiliative behaviors.

According to the criminal career paradigm, the link between past and future criminal activities is important and the desistance process may vary for individuals whose criminal trajectories were punctuated by failure compared with those who achieved a certain level of success. This study, based on the life narratives of 27 individuals who maintained a state of nonoffending for more than a year, examines how criminal achievement modulates the desistance process. The aim is to understand whether criminal achievement acts as a barrier or a facilitator in the desistance process. A short questionnaire based on the life-history calendar method was used to classify individuals according to the parameters of their criminal careers. Narrative life stories were then used to look at the obstacles and frustrations encountered during desistance. The results show the relation between criminal achievement and desistance is complex: success in criminal activities is not always hindering desistance.

This study presents findings on patterns of communication between internationally adopted children and their mothers in order to better understand the nature of these interactions and their influence on language learning. We examined maternal language use and joint attention behaviors of mothers and their children in 21 mother-child pairs: 10 pairs included children adopted from China living in francophone families, and 11 included francophone children living with their biological families; all were matched for socioeconomic status, sex, and age. The children were, on average, 15 months of age at initial testing when they were video-taped with their mothers for purposes of describing the mothers' language use and the mothers' and children's joint attention behaviors. Vocabulary development was assessed at 15 and again at 20 months of age using the MacArthur Communicative Development Inventory. The results support the conclusion that adoptive mothers play an active role in promoting and maintaining joint attention and that the redirecting style they used the most and that correlated with their children's later vocabulary development contrasts with the following style that correlates with vocabulary development in nonadopted children raised in mainstream North American families.

Language use and joint attention (JA) strategies were examined during interactions between francophone mothers and fathers and either their birth children (n = 10) or their internationally adopted children from China (n = 8), once when the children were 15 months old and again at 20 months, on average. Results showed that mothers engaged in more JA episodes and tended to talk more with their children than did fathers; however, this was influenced by the language-learning situation of the child. Specifically, the adoptive parents engaged more with their children than did the birth parents, and the behaviors of the internationally adopted mothers and fathers were more similar to each other than to those of the birth parents, arguably to support their children's unique language-learning situation. However, in contrast to a previous study that examined JA with adoptive mothers, the adoptive fathers' interaction styles with their children at 15 months were not related to children's vocabularies at 20 months as has been observed for mothers.It is becoming increasingly evident that the nature and quantity of input children are exposed to during early language acquisition can play an important role in their language development and even ultimate attainment (e.g., Hoff, 2006). In particular, it has been found that input during episodes of joint attention (JA) between children and their parents plays a role in children's early language learning (e.g.,

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