Increased locus coeruleus tonic activity causes disengagement from a patch-foraging task

High levels of locus coeruleus (LC) tonic activity are associated with distraction and poor performance within a task. Adaptive gain theory (AGT; Aston-Jones & Cohen, 2005) suggests that this may reflect an adaptive function of the LC, encouraging search for more remunerative opportunities in times of low utility. Here, we examine whether stimulating LC tonic activity using designer receptors (DREADDs) promotes searching for better opportunities in a patch-foraging task as the value of a patch diminishes. The task required rats to decide repeatedly whether to exploit an immediate but depleting reward within a patch or to incur the cost of a time delay to travel to a new, fuller patch. Similar to behavior associated with high LC tonic activity in other tasks, we found that stimulating LC tonic activity impaired task performance, resulting in reduced task participation and increased response times and omission rates. However, this was accompanied by a more specific, predicted effect: a significant tendency to leave patches earlier, which was best explained by an increase in decision noise rather than a systematic bias to leave earlier (i.e., at higher values). This effect is consistent with the hypothesis that high LC tonic activity favors disengagement from current behavior, and the pursuit of alternatives, by augmenting processing noise. These results provide direct causal evidence for the relationship between LC tonic activity and flexible task switching proposed by AGT.     

Attachment orientations and depression: a longitudinal study of new parents

In this longitudinal study, we followed a large sample of first-time parents (both partners) across the first 2 years of the transition to parenthood. Guided by attachment theory (Bowlby, 1969), we tested several predictions about how attachment anxiety and avoidance are related to the incidence, maintenance, increase, and decline of depressive symptoms in both sexes across the first 2 years of the transition. We found that (a) the association between attachment anxiety and depressive symptoms was moderated by factors related to the marital and/or romantic relationship; (b) the association between avoidance and depressive symptoms was moderated by factors related to family responsibilities; (c) styles of caregiving provided by romantic partners affected depressive symptoms differently among anxious and avoidant persons; and (d) in certain predictable situations, depressive symptoms persisted at higher levels or increased to higher levels in anxious or avoidant persons across the 2-year transition period. Important implications of these results are discussed.     

Blaming, praising, and protecting our humanity: the implications of everyday dehumanization for judgments of moral status

Being human implies a particular moral status: having moral value, agency, and responsibility. However, people are not seen as equally human. Across two studies, we examine the consequences that subtle variations in the perceived humanness of actors or groups have for their perceived moral status. Drawing on Haslam's two-dimensional model of humanness and focusing on three ways people may be considered to have moral status - moral patiency (value), agency, or responsibility - we demonstrate that subtly denying humanness to others has implications for whether they are blamed, praised, or considered worthy of moral concern and rehabilitation. Moreover, we show that distinct human characteristics are linked to specific judgments of moral status. This work demonstrates that everyday judgments of moral status are influenced by perceptions of humanness.     

Inexpensive video cameras used by parents to record social communication in epidemiological investigations in early childhood-A feasibility study

We tested the feasibility of parents recording social interactions with their infants using inexpensive camcorders, as a potential method of effective, convenient, and economical large scale data gathering on social communication. Participants were asked to record two short video clips during either play or a mealtime, and return the data. Sixty-five video clips (32 pairs) were returned by 33 families, comprising 8.5% of families contacted, 44.6% of respondents and 51.6% of those sent a camcorder, and the general visual and sound quality of the data was assessed.Audio and video quality were adequate for analysis in 85% of clips and several social behaviours, including social engagement and contingent responsiveness, could be assessed in 97% of clips. We examined two quantifiable social behaviours quantitatively in both adults and infants: gaze direction and duration, and vocalization occurrence and duration. It proved difficult for most observers to obtain a simultaneous clear view of the parents and infant's face.Video clips obtained by parents are informative and usable for analysis. Further work is required to establish the acceptability of this technique in longitudinal studies of child development and to maximize the return of usable data.     

Elemental versus configurai models of categorization in children and adults

In experiment 1, 7-and 8-year-old children learned to classify six features, A–F, as belonging to one of two artificial categories, or to neither category. Feature A and the compound BC were designated as members of Category 1, the compounds DE and EF were members of category 2, while D alone and the compound AB, belonged to neither category. Following successful learning, the participants were asked to rate two groups of test features, ABC and DEF, as likely members of their respective categories. Participants' certainty ratings of the categorization of the compound DEF were greater than for the compound ABC. Experiment 2 replicated the results of experiment 1 with adult participants. These data are at odds with predictions from an elemental associative theory, that suggested by Rescorla and Wagner (1972), which assumes that category judgements are made on the basis of associations between individual features and a category.