Visual category-selectivity for faces, places and objects emerges along different developmental trajectories

The organization of category-selective regions in ventral visual cortex is well characterized in human adults. We investigated a crucial, previously unaddressed, question about how this organization emerges developmentally. We contrasted the developmental trajectories for face-, object-, and place-selective activation in the ventral visual cortex in children, adolescents, and adults. Although children demonstrated adult-like organization in object- and place-related cortex, as a group they failed to show consistent face-selective activation in classical face regions. The lack of a consistent neural signature for faces was attributable to (1) reduced face-selectivity and extent of activation within the regions that will become the FFA, OFA, and STS in adults, and (2) smaller volumes and considerable variability in the locus of face-selective activation in individual children. In contrast, adolescents showed an adult-like pattern of face-selective activation, although it was more right-lateralized. These findings reveal critical age-related differences in the emergence of category-specific functional organization in the visual cortex and support a model of brain development in which specialization emerges from interactions between experience-dependent learning and the maturing brain.     

Can a Laboratory Measure of Emotional Processing Enhance the Statistical Prediction of Aggression and Delinquency in Detained Adolescents with Callous-unemotional Traits?

In this cross-sectional study, we investigated whether the combination of the presence of callous-unemotional (CU) traits and emotional deficits to distressing stimuli, assessed by a computerized dot-probe task, enhanced the statistical prediction of aggression and delinquency in a sample of 88 detained and predominantly African-American (68%) adolescents (M age = 15.57; SD = 1.28). Overall, self-reported CU traits were associated with self-report measures of aggression and delinquency, but not with official records of arrests. However, there was an interaction between CU traits and emotional deficits for predicting self-reported aggression, self-reported violent delinquency, and a record of violent arrests. Youth high on CU traits and who showed a deficit in their responses to visual depictions of distress showed the highest levels of aggression and violent delinquency.     

The Morning After: Gender Differences In Attributions About Alcohol-Related Sexual Encounters1

Traditional sex role characteristics suggest that women may be more dissatisfied with casual sex than men. We investigated this notion by examining the reactions of women and men to a hypothetical, first-time sexual encounter. An additional factor that was hypothesized to affect reactions was the presence of alcohol, which may serve as a cue for sexual disinhibition. College students read a scenario depicting a consensual sexual encounter between two people who met at a party, and made judgments about the partners' behavior and characteristics. Four versions of the scenario varied the alcohol consumption of both characters. Results showed that men were more likely than women to find the behavior of each partner socially acceptable, to foresee a positive future for the couple as a result of their sexual encounter, and to predict that they themselves would engage in similar behavior. Although no main effects for alcohol consumption were found, alcohol consumption interacted with gender to influence judgments about the characters' sexuality. Results are discussed in terms of sex role stereotyping and the tendency of both sexes to misunderstand or misperceive each other's sexual feelings.     

The influence of pubertal maturation on antisaccade performance

Adolescence is a period characterized by continued improvements in inhibitory control, and this persisting immaturity is believed to interact with affective/motivational behavior to generate the impulsive and risk‐taking behavior evidenced at this time. Puberty is a central event of adolescence that has been shown to influence affective/motivational behavior. However, despite plausible mechanisms by which puberty might influence inhibitory control, researchers have yet to test this possibility rigorously. Thus, we designed a study to examine the unique role of pubertal maturation, independent of age, in the development of inhibitory control. In order to minimize age‐related variability while maximizing pubertal status variability, we recruited 78 participants (34 F) whose ages narrowly spanned the mean age of gonadarche for each sex (F: ages 11–13, M: ages 12–14). Two complementary measures were used to assess pubertal status: (1) circulating blood serum testosterone and estradiol levels reflecting internal manifestations of pubertal maturation, and (2) Tanner staging by a trained nurse reflecting pubertal maturation's external manifestations. Inhibitory control was assessed using the antisaccade task, and findings were adjusted for the potential effect of age. Results revealed no association between testosterone levels and error rates or response latencies in either sex. In girls, estradiol levels were not associated with error rates, but were associated with faster response latencies. There was similarly no association between Tanner status and error rates, although girls in more advanced pubertal stages showed faster response latencies. Power analyses indicate that findings of a lack of association did not reflect limited statistical power. Thus, in a study designed to isolate the effects of pubertal maturation independent of age, both external and internal indices of pubertal maturation converged to indicate that age‐related improvements in cold antisaccade performance are independent of pubertal maturation.     

Spatial perseveration error by alpacas (<Emphasis Type="Italic">Vicugna pacos</Emphasis>) in an A-not-B detour task

Spatial perseveration has been documented for domestic animals such as mules, donkeys, horses and dogs. However, evidence for this spatial cognition behavior among other domestic species is scarce. Alpacas have been domesticated for at least 7000 years yet their cognitive ability has not been officially reported. The present article used an A-not-B detour task to study the spatial problem-solving abilities of alpacas (Vicugna pacos) and to identify the perseveration errors, which refers to a tendency to maintain a learned route, despite having another available path. The study tested 51 alpacas, which had to pass through a gap at one end of a barrier in order to reach a reward. After one, two, three or four repeats (A trials), the gap was moved to the opposite end of the barrier (B trials). In contrast to what has been found in other domestic animals tested with the same task, the present study did not find clear evidence of spatial perseveration. Individuals’ performance in the subsequent B trials, following the change of gap location, suggests no error persistence in alpacas. Results suggest that alpacas are more flexible than other domestic animals tested with this same task, which has important implications in planning proper training for experimental designs or productive purposes. These results could contribute toward enhancing alpacas’ welfare and our understanding of their cognitive abilities.     

The effect of spatial-frequency filtering on the visual processing of global structure

In three experiments we measured reaction times (RTs) and error rates in identifying the global structure of spatially filtered stimuli whose spatial-frequency content was selected by means of three types of 2-D isotropic filters (Butterworth of order 2, Butterworth of order 10, and a filters with total or partial Gaussian spectral profile). In each experiment, low-pass (LP), bandpass (BP), and high-pass (HP) filtered stimuli, with nine centre or cut-off spatial frequencies, were used. Irrespective of the type of filter, the experimental results showed that: (a) RTs to stimuli with low spatial frequencies were shorter than those to stimuli with medium or high spatial frequencies, (b) RTs to LP filtered stimuli were nearly constant, but they increased in a nonmonotonic way with the filter centre spatial frequency in BP filtered stimuli and with the filter cut-off frequency in HP filtered stimuli, and (c) the identification of the global pattern occurred with all visible stimuli used, including BP and HP images without low spatial frequencies. To remove the possible influence of the energy, a fourth experiment was conducted with Gaussian filtered stimuli of equal contrast power (c(rms) = 0.065). Similar results to those described above were found for stimuli with spatial-frequency content higher than 2 cycles deg(-1). A model of isotropic first-order visual channels collecting the stimulus spectral energy in all orientations explains the RT data. A subsequent second-order nonlinear amplitude demodulation process, applied to the output of the most energetic first-order channel, could explain the perception of global structure of each spatially filtered stimulus, including images lacking low spatial frequencies.     

The apple does not fall far from the tree: attachment styles and personality vulnerabilities to depression in three generations of women

The intergenerational transmission of attachment insecurity was examined in a community sample of 300 participants consisting of 100 three-generation triads of women. It was hypothesized that personality vulnerabilities mediate the association between attachment insecurity and depression within each generation. Findings show significant intergenerational congruence of trait vulnerabilities and attachment styles. Moreover, the second generation's attachment dimensions and personality vulnerabilities were found to mediate the association between first- and third-generation scores on attachment and vulnerability variables. Findings supported the following hypothesized within- and between-generation paths: Within generations, self-criticism was found to mediate the association between attachment insecurity and depression; between generations, depression, but not self-criticism, mediated the association between assessments of attachment insecurity in mothers and their daughters. This study constitutes a first approach to the delineation of the role played by self-criticism in the association between negative models of the self and depression across generations.     

Youth Living with HIV as Peer Leaders

Community-based service providers often hire youth living with HIV (YLH) as peer leaders for delivering HIV education to uninfected adolescents. Life narratives were collected from 44 YLH during a hypotheses-generating two-year ethnographic study. About 30% of the youth were employed as peer educators. While 60% of the 44 youth had a lower-class background, only 23% of the peer leaders were lower class. One-fifth of the sample were female, but more than one-half of the peer leaders were female. After identifying and categorizing difficulties experienced by the peer leaders, a frequency count of each theme was conducted. Issues about professional boundaries were evident in 38.5% of the youth's narratives, indicating conflicts in their roles as peer leaders; 23% of the youth engaged in substance use and sexual behaviors that placed themselves and uninfected youth in their peer educator programs at risk; and 8% of the youth reported relapse while peer leaders. The observations suggest reconsideration or restructuring of existing peer-education models that employ YLH.