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.     

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.     

Religious doubt,financial strain,and depressive symptoms among older Mexican Americans

A number of studies suggest that various positive aspects of religion help older people cope more effectively with stress. However, the literature further indicates that religion may have negative as well as positive influences in the stress process. This suggests that instead of enhancing coping efforts, religion may also exacerbate the effects of stress. The purpose of this study was to see if one negative aspect of religion (i.e., religious doubt) exacerbates the effects of financial strain on depressive symptoms among older Mexican Americans. A nationwide survey of 1005 older Mexican Americans was conducted. The findings suggest that the effects of financial strain on depressive symptoms are stronger for older Mexican Americans who have more doubts about religion. This study aims to contribute to the literature by assessing the negative aspects of religion with data provided by an ethnic group that has been largely overlooked in the literature.     

From Classroom to Controversy: Conflict in the Teaching of Religion

What happens when a class assignment becomes a source of controversy? How do we respond? What do we learn? By describing the controversy surrounding an assignment on religion and representation, this article examines conflict's productive role in teaching about New Religious Movements (NRMs) and religion. It suggests that we consider how our personal and institutional dispositions toward conflict influence our pedagogies. Moreover, it urges us to consider how teaching conflicts within and/or between disciplines can enhance our learning objectives and stimulate students' ability to think critically.     

Older Mexican Americans and God-mediated control: exploring the influence of Pentecostal/Evangelical affiliation

A growing number of Mexican Americans are leaving the Catholic Church to join Pentecostal and Evangelical congregations. The purpose of this study is to explore the benefits that are associated with joining Pentecostal and Evangelical congregations. A latent variable model is specified that contains the following core relationships: (1) older Mexican Americans who affiliate with Pentecostal/Evangelical congregations will attend worship services more often; (2) older Mexican Americans who attend church more often will receive more spiritual support from their fellow church members; (3) older Mexican Americans who receive more spiritual support will develop a closer relationship with God; and (4) older Mexican Americans who have a close relationship with God will develop a stronger sense of God-mediated control. Findings from a nationwide survey of older Mexican Americans provide support for each of these linkages.     

The effects of marker-related temporal cues on auditory gap-duration discrimination

In three experiments, we examined the ability of listeners to discriminate the duration of temporal gaps (silent intervals) and the influence of other temporal stimulus properties on their performance. In the first experiment, gap-duration discrimination thresholds were measured either in continuous noise or with noise markers with durations of 3 and 300 ms. Thresholds measured with 300-ms markers differed from those measured in continuous noise or with 3-ms markers. In the second experiment, stimuli consisting of a gap between two discrete markers were generated such that the gap duration, the onset-to-onset duration between markers, and the duration of the first marker were pseudorandomized across trials. Listeners’ responses generally were consistent with the cue that was identified as the target cue from among the three cues in each block of trials, but the data suggested that the onset-to-onset cue was particularly salient in all conditions. Using a modified method-of-adjustment procedure in the third experiment, subjects were instructed to discriminate between the durations of gaps in discrete markers of different durations in two intervals, where the gap duration in one interval was adapted to measure the point of subjective equality. Without feedback, listeners tended to equate the onset-to-onset times of the markers rather than the gap durations. Overall, the results indicated that listeners’ judgments of silent gaps between two discrete markers are strongly influenced by the onset-to-onset time, or rhythm, of the markers.