An investigation into the impact of acute stress on encoding in older adults

Acute psychological stress commonly occurs in young and older adults’ lives. Though several studies have examined the influence of stress on how young adults learn new information, the present study is the first to directly examine these effects in older adults. Fifty older adults (M age = 71.9) were subjected to either stress induction or a control task before learning two types of information: a short video and a series of pictures. Twenty-four hours later, they were exposed to misleading information about the video and then completed memory tests for the video and pictures. Heart rate and cortisol measures suggest that a physiological stress response was successfully induced. Though pre-encoding stress had little impact on memory accuracy, stress did influence errors of omission on the cued recall test for the video. Findings are discussed in the context of previous research examining the effects of stress on memory in older adults.     

Wittgenstein on Metaphysical/Everyday Use

Wittgenstein remarked 'What we do is to bring words back from their metaphysical to their everyday use' ( PI §116). On this basis, his 'later philosophy' is generally regarded as a version of 'ordinary language philosophy'. He is taken to criticize philosophers for making ('metaphysical') statements which deviate in different ways from the everyday use of some of their component expressions. I marshal textual evidence for another reading of this remark, and show that he used 'metaphysical' in a traditional way, namely, to describe philosophical attempts to delineate the essence of things by establishing necessities and impossibilities. On his conception, 'everyday' simply means 'non-metaphysical' (in this precise sense). Comparisons of philosophical utterances with non-philosophical uses of words are meant to call attention to this crucial distinction.     

The Role of Religious Beliefs in Coping With Chronic Illness

The authors examined the ways in which 40 women with chronic illnesses (rheumatoid arthritis, osteoporosis, multiple sclerosis, systemic lupus erythematosus, or a combination of these disorders) used religious beliefs as a means of coping with their illnesses, The participants, all between the ages of 28 and 79 years, were interviewed about the role religious beliefs played in their experiences and the ways in which they made meaning in their lives or coped with their illnesses. The majority of the women reported that religious beliefs were important in living with a chronic illness. In addition, more women who were identified as coping well with their illness reported strong religious beliefs, whereas the majority of women identified as poor copers reported that religion was unimportant or that they had no religious beliefs.     

Separation,self‐disclosure,and social evaluation anxiety as facets of trait social anxiety

In the current article, we propose an expansion of the trait anxiety concept to include interpersonal or social facets of trait anxiety involving separation from significant others and disclosing aspects of the self to others, as a supplement to the existing focus on social evaluation anxiety. Participants in three studies completed a modified version of the Endler Multidimensional Anxiety Scales that included a measure of trait social evaluation anxiety, as well as new measures of trait separation anxiety and trait self‐disclosure anxiety (i.e., three measures of trait social anxiety). Results showed that the social evaluation, separation, and self‐disclosure trait anxiety scales have strong psychometric properties and that they represent distinct but related components of trait anxiety. With respect to validity, the facets of trait social anxiety were predictive of related variables including self‐concealment, anxiety sensitivity, and trait worry. The theoretical and practical implications of a multifaceted approach to trait social anxiety are discussed in terms of an expanded multidimensional interaction model of anxiety. Copyright © 2002 John Wiley & Sons, Ltd.     

Intelligence and information processing during an auditory discrimination task with backward masking: an event-related potential analysis

The relation between mental ability and auditory discrimination ability was examined by recording event-related potentials from 60 women during an auditory oddball task with backward masking. Across conditions that varied in intensity and in the interval between the target and masking stimuli, the higher ability (HA) group exhibited greater response accuracy, shorter response times, larger P3 amplitude, and shorter P3 latency to target stimuli than the lower ability (LA) group. When instructed to ignore the stimuli, the HA group exhibited shorter mismatch negativity latency to deviant tones than the LA group. The greater speed and accuracy of auditory discrimination for the HA group, observed here with multiple measures, is not a consequence of response strategy, test-taking ability, or attention deployment.     

Adaptive categorization in unsupervised learning

In 3 experiments, the authors provide evidence for a distinct category-invention process in unsupervised (discovery) learning and set forth a method for observing and investigating that process. In the 1st 2 experiments, the sequencing of unlabeled training instances strongly affected participants' ability to discover patterns (categories) across those instances. In the 3rd experiment, providing diagnostic labels helped participants discover categories and improved learning even for instance sequences that were unlearnable in the earlier experiments. These results are incompatible with models that assume that people learn by incrementally tracking correlations between individual features; instead, they suggest that learners in this study used expectation failure as a trigger to invent distinct categories to represent patterns in the stimuli. The results are explained in terms of J. R. Anderson's (1990, 1991) rational model of categorization, and extensions of this analysis for real-world learning are discussed.     

Working memory, task switching, and executive control in the task span procedure

Four experiments explored the task span procedure: Subjects received lists of 1-10 task names to remember and then lists of 1-10 stimuli on which to perform the tasks. Task span is the number of tasks performed in order perfectly. Experiment 1 compared the task span with the traditional memory span in 6 practiced subjects and found little difference. Experiment 2 compared the task span and the memory span in 64 unpracticed subjects and also found little difference. Experiment 3 compared practice with consistent and varied lists to address retrieval from long-term memory. Experiment 4 manipulated the number of task switches and found that it had little effect on task spans. The results suggest there is no trade-off between storage and task switching, which supports some theories of executive control and challenges others.     

Sequence effects in the categorization of tones varying in frequency

In contrast to exemplar and decision-bound categorization models, the memory and contrast models described here do not assume that long-term representations of stimulus magnitudes are available. Instead, stimuli are assumed to be categorized using only their differences from a few recent stimuli. To test this alternative, the authors examined sequential effects in a binary categorization of 10 tones varying in frequency. Stimuli up to 2 trials back in the sequence had a significant effect on the response to the current stimulus. The effects of previous stimuli interacted with one another. A memory and contrast model, according to which only ordinal information about the differences between the current stimulus and recent preceding stimuli is used, best accounted for these data.     

A semi-persistent adult ocular dominance plasticity in visual cortex is stabilized by activated CREB

The adult cerebral cortex can adapt to environmental change. Using monocular deprivation as a paradigm, we find that rapid experience-dependent plasticity exists even in the mature primary visual cortex. However, adult cortical plasticity differs from developmental plasticity in two important ways. First, the effect of adult, but not juvenile monocular deprivation is strongly suppressed by administration of barbiturate just prior to recording visual evoked potentials, suggesting that the effect of adult experience can be inactivated acutely. Second, the effect of deprivation is less persistent over time in adults than in juveniles. This correlates with the known decline in CREB function during maturation of the visual cortex. To compensate for this decline in CREB function, we expressed persistently active VP16-CREB and find that it causes adult plasticity to become persistent. These results suggest that in development and adulthood, the regulation of a trans-synaptic signaling pathway controls the adaptive potential of cortical circuits.     

Why can't we just get along? Interpersonal biases and interracial distrust

The authors review a series of studies that illustrate how one form of contemporary racial bias of Whites, aversive racism, can shape different perspectives of Blacks and Whites in ways that can undermine race relations. This research demonstrates that contemporary racism among Whites is subtle, often unintentional, and unconscious but that its effects are systematically damaging to race relations by fostering miscommunication and distrust. In particular, the authors examine the effects of aversive racism on outcomes for Blacks (e.g., in selection decisions), on the ways that Whites behave in interracial interactions, in the impressions that Whites and Blacks form of each other in these interactions, and on the task efficiency of interracial dyads.