The role of secondary covariates when estimating latent trait population distributions

The U.S. National Assessment of Educational Progress (NAEP), the Third International Mathematics and Science Study (TIMSS), and the U.S. Adult Literacy Survey collect probability samples of students (or adults) who are administered brief examinations in subject areas such as mathematics and reading (cognitive variables), along with background demographic (primary) and educational environment (secondary) questions. The demographic questions are used in the primary reporting, while the numerous explanatory secondary variables, or covariates, are only directly utilized in subsequent secondary analyses. The covariates are also used indirectly to create the plausible values (multiple imputations) that are an integral part of analyses because of the use of sparse matrix sampling of cognitive items. The improvement in the precision of the primary reporting due to the inclusion of the covariates is assessed here and contrasted with the precision of reporting using plausible values created using only the primary demographic variables.The results demonstrate that the improvement in precision depends on the matrix sampling designs for the cognitive assessments. The improvements range from essentially none for the most common designs, to moderate for some less common designs. Consequently, two potential changes in the reporting procedures that could improve the statistical and operational efficiency of primary reporting are (a) eliminate or reduce the collection of covariates and increase the number of cognitive items, (b) to avoid delays, eliminate the covariates from the creation of plausible values used for the primary reports, but include them later when creating public-use files for secondary analyses. The potential improvements in statistical and operational efficiency must be weighed against the intrinsic interest in the covariates, and the potential for small discrepancies in the primary and secondary reporting.Thanks to Donald Rubin, Robert Mislevy, and John Barnard for their helpful comments and computing assistance. This work was supported by NCES Grant 84.902B980011.     

Attentional control in the aging brain: insights from an fMRI study of the stroop task

Several recent studies of aging and cognition have attributed decreases in the efficiency of working memory processes to possible declines in attentional control, the mechanism(s) by which the brain attempts to limit its processing to that of task-relevant information. Here we used fMRI measures of neural activity during performance of the color-word Stroop task to compare the neural substrates of attentional control in younger (ages: 21-27 years old) and older participants (ages: 60-75 years old) during conditions of both increased competition (incongruent and congruent neutral) and increased conflict (incongruent and congruent neutral). We found evidence of age-related decreases in the responsiveness of structures thought to support attentional control (e.g., dorsolateral prefrontal and parietal cortices), suggesting possible impairments in the implementation of attentional control in older participants. Consistent with this notion, older participants exhibited more extensive activation of ventral visual processing regions (i.e., temporal cortex) and anterior inferior prefrontal cortices, reflecting a decreased ability to inhibit the processing of task-irrelevant information. Also, the anterior cingulate cortex, a region involved in evaluatory processes at the level of response (e.g., detecting potential for error), showed age-related increases in its sensitivity to the presence of competing color information. These findings are discussed in terms of newly emerging models of attentional control in the human brain.     

Blurring of emotional and non-emotional memories by taxing working memory during recall

Memories that are recalled while working memory (WM) is taxed, e.g., by making eye movements (EM), become blurred during the recall + EM and later recall, without EM. This may help to explain the effects of Eye Movement and Desensitisation and Reprocessing (EMDR) in the treatment of post-traumatic stress disorder (PTSD) in which patients make EM during trauma recall. Earlier experimental studies on recall + EM have focused on emotional memories. WM theory suggests that recall + EM is superior to recall only but is silent about effects of memory emotionality. Based on the emotion and memory literature, we examined whether recall + EM has superior effects in blurring emotional memories relative to neutral memories. Healthy volunteers recalled negative or neutral memories, matched for vividness, while visually tracking a dot that moved horizontally (“recall + EM”) or remained stationary (“recall only”). Compared to a pre-test, a post-test (without concentrating on the dot) replicated earlier findings: negative memories are rated as less vivid after “recall + EM” but not after “recall only”. This was not found for neutral memories. Emotional memories are more taxing than neutral memories, which may explain the findings. Alternatively, transient arousal induced by recall of aversive memories may promote reconsolidation of the blurred memory image that is provoked by EM.     

Stressors Arising in Highly Valued Roles and Change in Feeling Close to God Over Time

Abstract

The purpose of this study is to see if exposure to stressful life events changes the way older people feel about their relationship with God. Data from a nationwide, longitudinal study of older adults suggest that older people who encounter stressful life events believe their relationship with God has grown closer over time. There are, however, two important qualifications. First, stressors arising in roles that older people value highly appear to have a greater effect than events that are encountered in roles that are less important. Second, stressors emerging in highly valued roles affect the way older African Americans, but not older Whites, view their relationship with God.     

Lifetime Trauma,Prayer, and Psychological Distress in Late Life

The purpose of this study is to see whether prayer helps older people cope more effectively with the adverse effects of lifetime trauma. Data from a nationwide survey of older adults reveal that the size of the relationship between traumatic events and depressive symptoms is reduced for older people who believe that only God knows when it is best to answer a prayer and when they believe that only God knows the best way to answer it. The findings further reveal that these beliefs about prayer outcomes are especially likely to offset the effects of traumatic events that arose during childhood.     

An Examination of Stimulus Control in Fluency-Based Strategies: SAFMEDS and Generalization

Fluency-based strategies such as Say All Fast a Minute Each Day Shuffled (SAFMEDS) effectively promote fluent responding (i.e., high rate and accuracy). It is possible, however, that the stimulus control developed through these activities inhibits stimulus generalization. We investigated this concern in a two-part study with college students. Study 1 assessed generalization of rates of responding from training with SAFMEDS to a novel set of equivalent SAFMEDS flashcards. Results indicate that SAFMEDS promoted fluent responding, but rates of responding decreased during generalization probes. Furthermore, higher rates of responding during training were correlated with a greater decrease in rates of responding during generalization probes. This may indicate that students attend to irrelevant stimulus features of SAFMEDS during training. Study 2 examined the effects of embedding multiple-exemplar training within SAFMEDS. Results indicate that multiple-exemplar training can promote generalization of accurate and high-rate responding when incorporated in a SAFMEDS activity.     

Assessing the Prayer Lives of Older Whites,Older Blacks,and Older Mexican Americans: A Descriptive Analysis

The purpose of this study was to see whether differences emerge between older Whites, older Blacks, and older Mexican Americans in 12 measures of prayer. These measures assess 4 dimensions of prayer: the social context of prayer, interpersonal aspects of prayer, beliefs about how prayer operates, and the content or focus of prayers. Data from two nationwide surveys of older adults suggest that with respect to all four dimensions, the prayer lives of older Whites appear to be less developed than the prayer lives of older Blacks and older Mexican Americans. In contrast, relatively few differences were found in the prayer lives of older African Americans and older Mexican Americans. The theoretical implications of these findings are discussed.     

(Dis)armed friendship: impacts of colonial ideology on early Quaker attitudes toward American Indians

Quakers’ early relations with American Indians (especially the Lenne Lenape, later known as the Delaware Indians) were generally positive. Core Quaker principles were simplicity, integrity, equality and peace – principles that could coincide well with those of the similarly egalitarian Lenne Lenape, who had been designated peacekeepers by the Iroquois Confederacy. Although the relationship was different than that of other settlers and American Indians, it was still suffused with colonial ideology. From the founding of Pennsylvania to the period of Grant’s ‘Peace Policy’, Quakers had to negotiate two wars and changing attitudes to North American Indians by American Presidents and government. The paper focuses on corresponding shifts in Quaker attitudes and policies. Our interest is in Quaker responses to Native Americans over time, finding that Quakers became increasingly distanced from the Indians and focused on acculturation. In their zeal to become acceptable to American Governments and through that, assist Native Americans, Quakers had, in fact, assimilated themselves.     

Bullying and harassment at work and their relationships to work environment quality: An exploratory study

Team-based working has become a popular model of work organization. One of the expected yields of working in teams is collective learning. As team members work closely together they are likely to exchange information, which can enhance learning. One of the processes that may facilitate team learning is team conflict. In this study, 471 respondents, working in 84 teams in 38 organizations, indicated their perceptions of task conflict, relationship conflict, team learning, and their rating of the performance of the team. Task conflict was not related to team learning but was negatively related to the team members' rating of team performance. As was hypothesized, relationship conflict negatively affected team learning. Importantly, team learning was a strong predictor of the perceived team performance and partially mediated the relation between relationship conflict and performance.