Emotional expressions of female and male infants in a social and a nonsocial context

While observational studies of the emotional expressions of women and men have revealed several consistent patterns of gender differences, data pertaining to the emotional expressions of male and female infants are largely inconsistent. Attempting to trace the course of early emotional development in female and male infants, we undertook to compare the emotional expressions of boys and girls at 2 1/2 and 5 months of age in a variety of situations. All infants who participated in the study were from French-speaking Caucasian families of low and middle class. At each age level, infants were observed in a social and nonsocial situation. The social situation began with a mother—infant interaction, followed by a period during which the mother remained silent and still-faced. In the nonsocial situation, a mobile was presented and then removed. Infants' facial expressions were coded using the AFFEX system. Direction of gaze was also coded. Overall, boys' and girls' reactions were quite similar. At both ages, male and female infants spent more time looking at the toy than at their mother and showed more expressions of interest toward the toy. They also smiled more while interacting with their mother and displayed more negative expressions when facing their still-faced mother. One gender difference was found: At 2 1/2 months, girls smiled more than boys while interacting with their mother. Several explanations are proposed to account for these findings.     

Social problem-solving skills in children with traumatic brain injury: long-term outcomes and prediction of social competence.

The effects of childhood traumatic brain injury (TBI) on social problem-solving were examined in 35 children with severe TBI, 40 children with moderate TBI, and 46 children with orthopedic injuries (OI). The children were recruited prospectively following injuries that occurred between 6 and 12 years of age. They were followed longitudinally, and ranged from 9 to 18 years of age at the time of the current study, which occurred on average 4 years post injury. They were administered a semi-structured interview used in previous research on social problem-solving to assess the developmental level of their responses to hypothetical dilemmas involving social conflict. Children in the severe TBI group defined the social dilemmas and generated alternative strategies to solve those dilemmas at the same developmental level as did children in the OI group. However, they articulated lower-level strategies as the best way to solve the dilemmas and used lower-level reasoning to evaluate the effectiveness of the strategies. After controlling for group membership, race, socioeconomic status, IQ, and age, children's social problem-solving, and particularly the developmental level of their preferred strategies for resolving conflicts, predicted parents ratings of children's social skills, peer relationships, aggressive behavior, and academic performance. The findings indicate that children with severe TBI demonstrate selective, long-term deficits in their social problem-solving skills that may help to account for their poor social and academic outcomes.     

Differential involvement of the central amygdala in appetitive versus aversive learning

Understanding the function of the distinct amygdaloid nuclei in learning comprises a major challenge. In the two studies described herein, we used c-Fos immunolabeling to compare the engagement of various nuclei of the amygdala in appetitive and aversive instrumental training procedures. In the first experiment, rats that had already acquired a bar-pressing response to a partial food reinforcement were further trained to learn that an acoustic stimulus signaled either continuous food reinforcement (appetitive training) or a footshock (aversive training). The first training session of the presentation of the acoustic stimulus resulted in significant increases of c-Fos immunolabeling throughout the amygdala; however, the pattern of activation of the nuclei of the amygdala differed according to the valence of motivation. The medial part of the central amygdala (CE) responded, surprisingly, to the appetitive conditioning selectively. The second experiment was designed to extend the aversive versus appetitive conditioning to mice, trained either for place preference or place avoidance in an automated learning system (INTELLICAGE). Again, much more intense c-Fos expression was observed in the medial part of the CE after the appetitive training as compared to the aversive training. These data, obtained in two species and by means of novel experimental approaches balancing appetitive versus aversive conditioning, support the hypothesis that the central nucleus of the amygdala is particularly involved in appetitively motivated learning processes.     

Tactile experience induces c-fos expression in rat barrel cortex

Understanding gene expression that is responsive to sensory stimulation is central to elucidate molecular mechanisms underlying neuronal plasticity. In this study we demonstrate two new methods of stimulating whiskers that provide major sensory input to rat neocortex. In the first paradigm, animals were placed on the top of a cylinder and their vibrissae were brushed by hand. In the second paradigm, animals were placed for a brief period of time into a new, wired cage resulting in vibrissae stimulation when they explored the new environment. Both approaches induced c-Fos expression in barrel cortex corresponding to the stimulated vibrissae, especially in layer IV. Layers II/III and V/VI also showed c-Fos induction, but there were no detectable changes in layer VIb. The majority of c-Fos-expressing cells are probably not inhibitory neurons, because they do not show parvalbumin staining. Both paradigms, in contrast to the previous methods, are simple to use and do not require anesthesia, restraint of animals, or elaborate experimental setups.     

The Rites of Passage Framework as a Matrix of Transgression Processes in the Life Course

This work shows the contribution of concept of rites of passage and theory of liminality to the understanding of transformations in the course of a person’s life. The structural–functional analysis of empirical studies of physical changes, changing roles in society, and key changes in the area of mental and physical health conducted from the perspective of these theories has allowed to identify the three fundamental processes that govern the attainment of transformation and transgression into a new phase of life. The aim of this paper is to set out the processes identified in the course of functional–structural analysis of chosen studies and they comprise: (1) preservation of the sequence of the life course; (2) liminality: deconstruction, integration, and transformation; and (3) performativity. These processes provide a structural framework for understanding life crises, thus facilitating their study as phases of dynamic transformations connected with the successive roles and tasks over the life course.