Memories of reward and nonreward regulate the extinction and reacquisition of both excitatory and inhibitory associations

The memories of the unconditioned stimulus (US) and its absence (No US), symbolized as S^R and S^N, respectively, may be retrieved on US or No US trials giving rise to four types of associations, S^R → US, S^R → No US, S^N → US, and S^N → No US. Here, following acquisition under partial reward (PRF), rats were shifted either to different schedules of PRF (Experiment 1) or extinction (Experiments 1 and 2). Inhibitory S^R → No US associations formed in acquisition survived extinction and shifts to one, but not another type of PRF schedule (Experiments 1 and 2). Excitatory S^R → US associations also survived extinction (Experiment 2). These findings, as well as the acquisition findings of Experiment 2, are consistent with the sequential model but not with the only other two theories said to be able to explain PRF findings, the frustration hypothesis of Amsel and the attention hypothesis of Mackintosh [see Haselgrove, M., Aydin, A., & Pearce, J. M. (2004). A partial reinforcement extinction effect despite equal rates of reinforcement during Pavlovian conditioning. Journal of Experimental Psychology: Animal Behavior Processes, 30, 240–250]. Also, the reacquisition findings obtained here are inconsistent with two views applied to several learning phenomena, the rule-learning view and the position-item view.     

Infant-mother attachment in children with failure to thrive

This study may represent an advance in the study of failure to thrive (FTT), as (1) it is the first to use the disorganized/disoriented classification of infant-mother attachment (Main & Solomon, 1990) in a study of children with FTT, and (2) it includes measures of social processes associated with individual differences in attachment. Twenty-six children with FTT (10 “organic,” 16 “nonorganic”) and 28 normally growing children, ages 12 to 25 months, were seen in Ainsworth's Strange Situation. The FTT and control groups were equivalent on age of mother (28.0 and 28.6 years, respectively), annual family income ($37,700 and $24,100), and mother's marital status (56% and 52% married). The sample included African-American, Caucasian, and Latino families. In addition, measures of mother-child interaction and mothers' reports of social support and life stress were included. Children with FTT were less likely to show secure and more likely to show anxious, disorganized attachments than normally growing controls: Only 35% of FTTs were secure, whereas 46% showed disorganized attachments. In contrast, 64% of controls were secure and 7% were disorganized. Comparisons between FTTs and controls also revealed differences in maternal sensitivity and stressful social environments. There were no differences in patterns of attachment, level of acute malnutrition, maternal sensitivity, social support, or life stress between organic and nonorganic FTT groups, further discrediting this as a meaningful distinction. The organic and nonorganic groups differed only on a measure of chronicity of malnutrition. These results support the notion that disrupted parent-child relationships and stressful social environments are common in FTT, regardless of the etiology of growth failure. The findings suggest that treatments of FTT must address psychological, as well as medical, problems in these families.     

Millennials at Work: What We Know and What We Need to Do (If Anything)

There are a lot of opinions about who Millennials are, what they think and value, and how they will behave as they grow older and gain more experience in the workforce. The relatively sparse empirical research published on Millennials is confusing at best and contradictory at worst. As noted in this article and others in this special issue, however, there are a few topics including work attitudes, long-term health outcomes, and personality factors on which we have reasonably solid data to inform us about current and likely future behavior of Millennials. We address the importance of context for understanding behavior of people in different generations, a subject often missing from the discussion of generational similarities and differences. There are implications for practitioners of what we know and for how context affects behavior. We make suggestions for how practitioners can use the data available to inform decisions they make about working with Millennials. Finally, we discuss the importance of new directions of research on generational differences to help both practitioners and the research community better understand the realities of generational similarities and differences and rely less on urban myths or stereotypes.     

Boundaries of American Identity: Relations Between Ethnic Group Prototypicality and Policy Attitudes

We sought to document that the extent to which different ethnic groups are perceived as embodying the American identity is more strongly linked to antiminority policy attitudes and acculturation ideologies among majority‐group members (European Americans) than among minority‐group members (Asian Americans or Latino/as). Participants rated 13 attributes of the American identity as they pertain to different ethnic groups and reported their endorsement of policy attitudes and acculturation ideologies. We found a relative consensus across ethnic groups regarding defining components of the American identity. However, European Americans were perceived as more prototypical of this American identity than ethnic minorities, especially by European American raters. Moreover, for European Americans but not for ethnic minorities, relative ingroup prototypicality was related to antiminority policy attitudes and acculturation ideologies. These findings suggest that for European Americans, perceptions of ethnic group prototypicality fulfill an instrumental function linked to preserving their group interests and limiting the rights afforded to ethnic minorities.     

Children's and adults' parafoveal processes in German: Phonological and orthographic effects

Phonological and orthographic information has been shown to play an important role in parafoveal processing in skilled adult reading in English. In the present study, we investigated whether similar parafoveal effects can be found in children using the boundary eye tracking method. Children and adults read sentences in German with embedded target nouns which were presented in original, pseudohomophone (PsH), transposed-letter (TL), lower-case and control conditions to assess phonological and orthographic preview effects. We found evidence of PsH preview benefit effects for children. We also found TL preview benefit effects for adults, while children only showed these effects under specific conditions. Results are consistent with the developmental view that reading initially depends on phonological processes and that orthographic processes become increasingly important.