The present cross-sectional study investigated age and gender differences in motivational manifestations of the Big Five in a large German-speaking Internet sample (N = 19,022). Participants ranging in age from 16 to 60 years completed the Five Individual Reaction Norms Inventory (FIRNI; Denissen & Penke, 2008a), and two traditional Big Five…

The authors investigated normative beliefs about personality development. Young, middle-aged, and older adults indicated the age-relevance of 835 French adjectives by specifying person characteristics as typical for any age decade from 0 to 99 years. With this paradigm, the authors determined age-relevance (How typical is a characteristic for a…

Examined the developmental courses of temperamental constructs using structural equation model fitting with children from 3 to 48 months of age. Found that across all measurement occasions, models that fit best were those that allowed for stability in temperament to be at least partially mediated through intermediate forms of the trait. (JPB)

Explored genetic and environmental underpinnings of temperamental differences in 3- to 16-month-old twins and their parents. Found that additive genetic and shared environmental effects best represented smiling, laughter, and duration of orienting. Shared environmental effects fully accounted for co-twin similarity for soothability. Additive…

Assessed temperament of newborn twins using comprehensive neonatal exam that focused on irritability, resistance to soothing activity, and reinforcement value. Some infants were later assessed at 9 months. Emotional activity appeared to be core dimension stretching over ages and is discussed in relation to formulations of infant temperament.…

Examined role of infant and toddler temperament in predicting 2-year olds' empathy. Found that children showed relatively more concern for mother's distress, but were also responsive to unfamiliar victims. Unreacting infants showing little affect also showed less empathy toward the unfamiliar adult almost two years later. Inhibition toward…

Evaluated gender differences in infant and maternal emotional expressivity and regulation with 6-month-old infants and their mothers, using Tronick's face-to-face still-face model. Found that maternal affect, matching, rate of change between matching and mismatching states, and synchrony in the play preceding the still face differentially mediated…

The predictive relation between neonatal behavior and temperament at 24 months was examined for 67 infants selected from the full socioeconomic status (SES) distribution. Initial ratings were made when the infants were one to four days old. Irritable neonates were rated as more upset, less attentive to stimuli, and less responsive to the staff at…

To further understanding of temperament-interaction relationships, patterns of interactive behavior were observed in 30 lower-class mother-infant dyads (15 irritable and 15 nonirritable infants) at monthly intervals over a 6-month period. Findings revealed that maternal behavior was systematically more positive with nonirritable infants that with…