Hippocampus-dependent strategy choice predicts low levels of cell proliferation in the dentate gyrus

Neurogenesis continues to occur throughout life in the mammalian hippocampus. Previous research has suggested that the production of new neurons in the hippocampus during adulthood may be related to hippocampus-dependent learning and memory. However, the exact relationship between adult neurogenesis and learning and memory remains unclear. Here we investigated whether learning strategy selection is related to cell proliferation or to survival of new neurons in the hippocampus of adult male rats. We trained rats on alternating blocks of hippocampus-dependent (hidden platform) and hippocampus-independent (visible platform) versions of the Morris water task with the platform always in the same position. Following training, rats were given a probe session during which the platform was visible and in a novel location. Preferred strategy was determined by observing the initial swim path. Rats were classified as place strategy (hippocampus-dependent) users if they swam to the old platform location. Cue strategy (hippocampus-independent) users were classified as those rats that swam initially to the visible platform. Our results indicate that rats that preferentially used a place strategy had significantly lower cell proliferation than cue strategy users. However, there was no significant difference in cell survival or number of immature neurons between strategy user groups. These results suggest that low levels of cell proliferation in the dentate gyrus may be conducive or coincident with more efficient memory processing in the hippocampus.     

Problem-solving strategies in aggressive and nonaggressive children

Problem-solving strategies in hypothetical social situations were studied in 103 aggressive and 79 nonaggressive children. Subjects solved six aggression-provoking situations from children's ordinary lives. Causal thinking, alternative thinking, and prognosticating consequences were evaluated. Cognitions of aggressive children differed from those of nonaggressive children. The greatest differences were found not in high aggressiveness but in aggressive childrens' inability to detect constructive alternatives to aggressive behavior. A child's aggressiveness was a more important determinant than was sex. These findings combined with the finding that strategies can be learned offer an approach to primary prevention.     

Development of social problem‐solving strategies and changes in aggressive behavior: A 7‐year follow‐up from childhood to late adolescence

The aim of this study was to predict a stability of aggressive behavior on the basis of social problem‐solving strategies. Subjects were a total of 120 children, but complete follow‐up data were available only in 47 cases. Their aggressive behaviors were peer rated, and problem‐solving strategies were assessed in childhood subjects being 10 years on average, and 7 years later. Association between a development of social strategies and changes in aggressive behavior was studied with personality‐oriented pattern analyses. The main finding was that a development of strategies predicted a stability or changes of aggressive behavior very well. Aggressive strategies, both in childhood and in adolescence, as well as a lack of constructive alternatives characterized permanently aggressive subjects. Turning from nonaggressive to aggressive behavior was also explained by aggressive problem‐solving strategies, while a positive development, i.e., turning from childhood aggressive to adolescent nonaggressive behavior, was possible only if a person had never used aggressive strategies. Agreement between behavior and strategies was higher among girls. The findings supported a claim that intervention of aggressive behavior may be possible by modifying social strategies. Aggr. Behav. 25:269–279, 1999. © 1999 Wiley‐Liss, Inc.     

Adolescent temperament,perceived social support,and depressive tendencies as predictors of depressive tendencies in young adulthood

A 5 year longitudinal study investigated the interrelations of temperament dimensions (negative emotionality, activity, and sociability), perceived social support (friend, significant other, and family support), and depressive tendencies. Temperament (EASTS; Buss, 1991), perceived social support (PSS‐R; Blumenthal, Burg, Barefoot, Williams, Haney and Zimet, 1987) and depressive tendencies (a modified version of the BDI) were measured by self‐reports in a randomly selected, community‐based sample of 302 adolescents at age 15, and depressive tendencies were measured again five years later at age 20. The authors hypothesized a model comprising direct as well as mediated effects between the adolescent predictor variables and depressive tendencies in young adulthood. The structural modelling analyses supported these hypotheses in part, and also indicated some qualitative sex differences. For both girls and boys, a significant direct as well as mediating role was indicated for the current level of depressive tendencies: depressive tendencies at age 15 predicted depressive tendencies at age 20, also mediating the effects of negative emotionality at age 15, and additionally mediating the effects of a low level of activity in girls and a low level of family support in boys. Furthermore, even when the prior level of depressive tendencies was controlled, direct effects were indicated in boys for a low level of sociability, and in girls for significant other support, which also mediated the effects of a low level of sociability. These results highlight the importance of the sex‐differentiated interplay of both intrapersonal and psychosocial factors in relation to depressive tendencies both during adolescence and from adolescence to young adulthood. Copyright © 1999 John Wiley & Sons, Ltd.     

Family context of infantile colic

Psychological factors in families with a colicky baby were studied. A total of 59 families who had enrolled on the basis of information received at the postpartum wards in the city of Turku, Finland, were included in this study. In addition, 58 families with age-matched infants were selected as a control group. These families kept a diary of the infant's crying. Thirty-six infants fulfilled the criteria for severe colic. Twenty-three families with a baby who cried excessively but did not fulfill the criteria were defined as the moderate colic group. A semistructured family interview was carried out to assess the structure, communcation patterns, functioning, and affective tone of the families. Mothers and fathers were younger in the moderate colic group compared with parents in the other groups. In the moderate colic families, the infant was more often the first child than in the control families. On the other hand, neither the infant's gender nor the education of the parents was related to infant's crying. Organized family structure and strong parental coalition were more often present in the severe colic and control groups than in the moderate colic group. Increased family chaos was noted in this group. The severe and moderate colic families had more enmeshed individual boundaries. Generational boundaries were enmeshed in the moderate colic families. Communication patterns did not differ between the groups. The families with a severely or moderately crying baby were less flexible, had decreased ability to cope with daily activities, and showed less energy and vitality than the control families. Both the severe and moderate colic families expressed more anxiety and conflict compared to the control families. In conclusion, an association between infantile colic and psychological characteristics of the family was found. Moreover, the families with a moderately colicky infant had specific psychological features that differed from both the control families and those with severely colicky infants.     

Types of aggressive behavior among aggressive-preferred, aggressive non-preferred, non-aggressive preferred and non-aggressive non-preferred 14-year-old adolescents

This study examined differences in the types of aggressive behavior among aggressive-preferred, aggressive non-preferred, non-aggressive preferred and non-aggressive non-preferred adolescents. The subjects numbered 839 14-year-old adolescents (408 girls and 431 boys). Aggressive behavior as well as social preference i.e. popularity and rejection, were assessed by peer nominations. The types of aggressive behavior measured were intriguing, arguing, fighting and bullying. The results showed that not only the level, but also the types of aggressive behavior differentiated aggressive adolescents from the non-aggressive ones, and preferred adolescents from the non-preferred ones. The aggression profile of the aggressive and rejected adolescents was characterized more by intriguing and bullying than arguing or fighting. In contrast, that of non-aggressive adolescents was dominated more by arguing and fighting than intriguing. The results pointed to a more complex relationship between aggressive behavior and social preference than the general assumption that there is a higher rate of rejection among aggressive adolescents, and a higher rate of popularity among non-aggressive ones. Significant gender differences were also found.     

Adult attachment dimensions and recollections of childhood family context: associations with dispositional optimism and pessimism

The present study tested the theoretically inferred but not yet empirically tested association between dispositional optimism–pessimism and attachment security among 423 Finnish women and men. A second‐order latent variable representing a generalized representation of attachment insecurity in close relationships that included two latent constructs, the one representing romantic adult attachment dimensions and the other representing recollections of attachment‐related childhood family relationship, was associated with greater pessimism; the adult attachment dimension of high anxiety had unique and additional explanatory power, not accounted for by the generalized representation of attachment‐related insecurity. The model explained 48% of the variance in pessimism. The results clearly emphasize that additional studies are needed to clarify the role of interpersonal processes in dispositional optimism–pessimism. Copyright © 2004 John Wiley & Sons, Ltd.     

EAS temperaments as predictors of unemployment in young adults: A 9-year follow-up of the Cardiovascular Risk in Young Finns Study

EAS temperament traits (negative emotionality, activity, sociability) are known to be associated with psychosocial adjustment. We examined whether these traits also predict unemployment in young adults. The participants (n = 1493–1893) were from the population based Cardiovascular Risk in Young Finns Study. EAS temperaments were assessed three times during a 9-year period from 1992 to 2001. Unemployment status and duration of unemployment were assessed in 2001 when the participants were from 24- to 39 -year olds. Especially higher negative emotionality and lower activity were associated with greater likelihood of reporting unemployment at the end of the follow-up. Higher negative emotionality and lower sociability and lower activity predicted unemployment duration. These results suggest that temperament traits are associated with risk of unemployment.