The effect of experience and of dots’ density and duration on the detection of coherent motion in dogs

Knowledge about the mechanisms underlying canine vision is far from being exhaustive, especially that concerning post-retinal elaboration. One aspect that has received little attention is motion perception, and in spite of the common belief that dogs are extremely apt at detecting moving stimuli, there is no scientific support for such an assumption. In fact, we recently showed that dogs have higher thresholds than humans for coherent motion detection (Kanizsar et al. in Sci Rep UK 7:11259, 2017). This term refers to the ability of the visual system to perceive several units moving in the same direction, as one coherently moving global unit. Coherent motion perception is commonly investigated using random dot displays, containing variable proportions of coherently moving dots. Here, we investigated the relative contribution of local and global integration mechanisms for coherent motion perception, and changes in detection thresholds as a result of repeated exposure to the experimental stimuli. Dogs who had been involved in the previous study were given a conditioned discrimination task, in which we systematically manipulated dot density and duration and, eventually, re-assessed our subjects’ threshold after extensive exposure to the stimuli. Decreasing dot duration impacted on dogs’ accuracy in detecting coherent motion only at very low duration values, revealing the efficacy of local integration mechanisms. Density impacted on dogs’ accuracy in a linear fashion, indicating less efficient global integration. There was limited evidence of improvement in the re-assessment but, with an average threshold at re-assessment of 29%, dogs’ ability to detect coherent motion remains much poorer than that of humans.     

Segmented Paths? Mexican Generational Differences in the Transition to First-Time Homeownership in the United States

Homeownership represents an important indicator of immigrant incorporation and assimilation. This study is a longitudinal analysis of the transition to first-time homeownership among a cohort of youths followed from 1979 to 2009 using the National Longitudinal Survey of Youth (NLSY, 1979). In particular, I examine Mexican generational group differences in the transition to first-time homeownership over an observation period that spans 30 years while evaluating theories of straight-line and segmented assimilation. I find that Mexican homeownership rates do not increase in a linear fashion across generations, relative to native, non-Hispanic whites, even after controlling for various social, demographic, and economic characteristics. Furthermore, analyses limited to Mexicans reveal that first- and second-generation respondents exhibit more success in the transition to first-time homeownership than their third-generation counterparts. Contrary to observing linear gains in homeownership across generations, I find that Mexicans are experiencing segmented paths towards homeownership and achieving upward mobility across generations.     

Canadian Arab Youth at the Border: Cultural Dissociation,Fear Management,and Disciplining Practices in Securitized Spaces

In this paper, we explore what Canadian Arab youth do to navigate border and travel transit sites. Arab youth are the focus for this study because they are a neglected demographic of research in ethnic studies, compared to the more copious studies on Canadian Arabs. Our research empirically investigates the struggles that this youth demographic faces, and the efforts they undertake to manage their marginalization. Some of these efforts involve practices of cultural dissociation, fear management, and self-disciplining through behavioral self-surveillance. Drawing upon an existing body of research that recognizes the highly fraught and securitized nature of air travel and border transfer, particularly for Arab/Muslim populations, we use the findings from focus groups conducted in Kitchener-Waterloo to theoretically situate some of the real struggles of Canadian Arab youth. As prominent racialized and securitized identities in the War on Terror (WoT), Arab youth are often forced, or feel that they are forced to perform their Canadian-ness to substantiate their innocence, and in some cases, this requires minimalization, or even erasure of part of who they are.     

Effects of feedback reliability on feedback-related brain activity: A feedback valuation account

Adaptive decision making relies on learning from feedback. Because feedback sometimes can be misleading, optimal learning requires that knowledge about the feedback’s reliability be utilized to adjust feedback processing. Although previous research has shown that feedback reliability indeed influences feedback processing, the underlying mechanisms through which this is accomplished remain unclear. Here we propose that feedback processing is adjusted by the adaptive, top-down valuation of feedback. We assume that unreliable feedback is devalued relative to reliable feedback, thus reducing the reward prediction errors that underlie feedback-related brain activity and learning. A crucial prediction of this account is that the effects of feedback reliability are susceptible to contrast effects. That is, the effects of feedback reliability should be enhanced when both reliable and unreliable feedback are experienced within the same context, as compared to when only one level of feedback reliability is experienced. To evaluate this prediction, we measured the event-related potentials elicited by feedback in two experiments in which feedback reliability was varied either within or between blocks. We found that the fronto-central valence effect, a correlate of reward prediction errors during reinforcement learning, was reduced for unreliable feedback. But this result was obtained only when feedback reliability was varied within blocks, thus indicating a contrast effect. This suggests that the adaptive valuation of feedback is one mechanism underlying the effects of feedback reliability on feedback processing.     

Neural response to prosocial scenes relates to subsequent giving behavior in adolescents: A pilot study

Adolescence is characterized by extensive neural development and sensitivity to social context, both of which contribute to engaging in prosocial behaviors. Although it is established that prosocial behaviors are linked to positive outcomes in adulthood, little is known about the neural correlates of adolescents’ prosociality. Identifying whether the brain is differentially responsive to varying types of social input may be important for fostering prosocial behavior. We report pilot results using new stimuli and an ecologically valid donation paradigm indicating (1) brain regions typically recruited during socioemotional processing evinced differential activation when adolescents evaluated prosocial compared with social or noninteractive scenes (N = 20, ages 13–17 years, M_Age = 15.30 years), and (2) individual differences in temporoparietal junction recruitment when viewing others’ prosocial behaviors were related to adolescents’ own charitable giving. These novel findings have significant implications for understanding how the adolescent brain processes prosocial acts and for informing ways to support adolescents to engage in prosocial behaviors in their daily lives.     

The Role of Family in Latino Males’ Occupational Identity Development: A Thematic Analysis Based on Participants’ Occupation Outcomes

The continued growth of the Latino population in the United States is reshaping the nation’s workforce. Given that the majority of Latino children are raised in circumstances that limit their psychosocial development and success in the labor market, and given that Latino men continually lag behind their female peers in educational attainment, understanding how this population develops an occupational identity vis-à-vis their family contexts has become increasingly important. This study, utilizing a qualitative design, retrospectively explored the occupational identity development experiences vis-à-vis family of Latino boys born, raised, and living in California. Following a constructivist grounded theory approach, the purpose of the study was to generate a middle range theory of how Latino boys develop an occupational identity in the home that also explains the divergence of working-class and white-collar occupational paths. Interviews with Latino Americans were conducted using semi-structured interviewing techniques. Nine themes emerged from the data that, when pieced together, produce a model of the occupational identity development trajectories of the participants. Implications of the findings include a need for continued research into the Latino concept of family and parent roles.     

Consequences of International Migration on the Size and Composition of Religious Groups in Austria

Scientific knowledge on a population’s religious composition is essential to understand the challenges faced by societies today. It arises in opposition to speculations about the actual size of religious groups that have been increasingly present in the public discourse in Europe for many years. This is particularly the case in Austria where the flows of refugees and migrants coming from the Middle East and Afghanistan have intensified since 2011 and culminated in 2015. These sparked a debate on the actual size of the Muslim population in Austria. This study fills the gap by presenting estimates of the religious composition for 2016 and projections until 2046 based on several scenarios related to the three major forces affecting the religious composition: migration (including asylum seekers), differential fertility and secularisation. The projections demonstrate that religious diversity is bound to increase, mostly through immigration and fertility. We further focus on the role and implications of international migration on the age and sex composition within the six religious groups: Roman Catholics, Protestants, Orthodox, Muslims, other religions and unaffiliated. We find that the volume and composition of international migrants can maintain youthful age compositions in minority religions—Muslims and Orthodox. Sustained immigration leads to slower ageing but does not stop or reverse the process. The disparity between older majority and younger minority religious groups will further increase the cultural generation gap.     

A database of orthography-semantics consistency (OSC) estimates for 15,017 English words

Orthography–semantics consistency (OSC) is a measure that quantifies the degree of semantic relatedness between a word and its orthographic relatives. OSC is computed as the frequency-weighted average semantic similarity between the meaning of a given word and the meanings of all the words containing that very same orthographic string, as captured by distributional semantic models. We present a resource including optimized estimates of OSC for 15,017 English words. In a series of analyses, we provide a progressive optimization of the OSC variable. We show that computing OSC from word-embeddings models (in place of traditional count models), limiting preprocessing of the corpus used for inducing semantic vectors (in particular, avoiding part-of-speech tagging and lemmatization), and relying on a wider pool of orthographic relatives provide better performance for the measure in a lexical-processing task. We further show that OSC is an important and significant predictor of reaction times in visual word recognition and word naming, one that correlates only weakly with other psycholinguistic variables (e.g., family size, word frequency), indicating that it captures a novel source of variance in lexical access. Finally, some theoretical and methodological implications are discussed of adopting OSC as one of the predictors of reaction times in studies of visual word recognition.