Bright Light Therapy to Treat Depression in Individuals with Mild/Moderate or Severe Dementia.

This secondary analysis examined whether the benefits of bright light therapy on depression are greater in persons with mild/moderate or severe dementia. Exploratory analyses were also conducted to determine if bright light treatment targets different depressive symptom clusters based on dementia severity. Analyses using total scores from the instruments, Depressive Symptom Assessment for Older Adults and the Cornell Scale for Depression in Dementia, showed that bright light exposure is an equally effective intervention for depression in persons with both mild/moderate and severe dementia. Analyses of individual depressive subscales revealed that for disagreeable behavior and sleep impairment, bright light therapy appears to have greater benefits in persons with severe dementia than for those with mild/moderate dementia. Overall, this investigation supports the use of bright light therapy to treat depression regardless of dementia severity.

Effect of Bright Light Exposure on Depression and Agitation in Older Adults with Dementia.

This study examined the effects of bright light exposure on three measures of depression and four measures of agitation in persons with dementia residing in long-term care. Using a randomized controlled design, participants were randomly assigned to receive either bright light (n = 30) or low intensity light (n = 30) for eight weeks. Bright light exposure was associated with significant improvement in depression and agitation, while participants receiving low intensity light displayed higher levels of depression and agitation or no significant change. Findings support the use of bright light exposure to reduce depression and agitation in this population.

Childhood victimization, poly-victimization, and adjustment to college in women.

This study examines the relationships among poly-victimization (i.e., high cumulative levels of victimization), six aggregate categories of childhood victimization (property crime, physical assault, peer and sibling, witnessed and indirect, sexual, child maltreatment), and college adjustment in females. This study first examines the relative contributions of poly-victimization and individual categories of childhood victimization in predicting college adjustment. The study then examines whether poly-victimization contributes any unique variance, beyond that accounted for by the combination of all six aggregate categories. Regression analyses reveal that a) poly-victimization accounts for a significant proportion of variability in scores for college adjustment, beyond that accounted for by any of the six categories of childhood victimization alone, and b) the categories of childhood victimization contribute little to no variability beyond that accounted for by poly-victimization. Furthermore, poly-victimization accounts for a significant proportion of variability in college adjustment, beyond that already accounted for by the simultaneous entry of all six categories as predictor variables. Finally, although victimization does not predict GPA, it predicts other domains of college adjustment. Results suggest that counselors working with college students should a) assess multiple categories of victimization and poly-victimization, and b) evaluate clients' adjustment to college across multiple domains (e.g., academic, social, interpersonal).

Polyvictimization, childhood victimization, and psychological distress in college women.

Two studies examined the relationships among polyvictimization (i.e., high cumulative levels of victimization), six categories of childhood victimization (i.e., property crime, physical assault, peer/sibling, witnessed/indirect, sexual, and child maltreatment), and current psychological symptomatology in college females. Results indicated that exposure to multiple types of childhood victimization is common. Regression analyses revealed that polyvictimization accounted for a significant proportion of variability in scores for psychological distress beyond that accounted for by any victimization category alone. Moreover, the six categories separately accounted for little to no variability beyond that accounted for by polyvictimization. Finally, polyvictimization accounted for a significant proportion of variability in scores for psychological distress, beyond that already accounted for through the simultaneous entry of all six categories of victimization. Findings reiterate the importance for clinicians and researchers to comprehensively assess multiple categories of childhood victimization and polyvictimization and provide preliminary evidence that the total number of lifetime victimizations is at least as important, if not more important, than individual categories of victimization in predicting psychological distress.

Searching from the top down: ageing and attentional guidance during singleton detection.

Previous investigations of adult age differences in visual search suggest that an age-related decline may exist in attentional processes dependent on the observer's knowledge of task-relevant features (top-down processing). The present experiments were conducted to examine age-related changes in top-down attentional guidance during a highly efficient form of search, singleton detection. In Experiment 1 reaction times to detect targets were lower when target features were constant (feature condition) than when target features were allowed to vary between trials (mixed condition), and this reaction time benefit was similar for younger and older adults. Experiments 2 and 3 investigated possible interactions between top-down and bottom-up (stimulus-driven) processes. Experiment 2 demonstrated that search times for both age groups could be improved when targets varied on an additional feature from distractors (double-feature condition) but only when top-down control was available (feature search). In Experiment 3, the availability of top-down guidance enabled both younger and older adults to override the distracting effects of a noninformative spatial location cue. 'l'hese findings indicate that top-down attentional control mechanisms interact with bottom-up processes to guide search for targets, and that in the context of singleton detection these mechanisms of top-down control are preserved for older adults.

Cardiovascular reactivity and family history of hypertension: a meta-analysis.

A regression-based meta-analysis examined the degree to which the effects of a family history of hypertension on cardiovascular reactivity are moderated by the magnitude of cardiovascular responses elicited in challenge/task conditions. Mean change scores for negative family history groups were regressed on mean change scores for positive family history groups. The slopes of separate regression lines obtained for systolic and diastolic blood pressure and heart rate were significantly less than 1.0 and the y-intercepts for these regression lines were significantly greater than zero. This pattern indicates that family history differences in cardiovascular reactivity to stress are greatest in situations that elicit the smallest baseline-stressor change scores in non-family-history groups.

Age differences in factor analysis of EEG.

This study examined age differences in the factor structure of EEG using a 128-electrode system. Running EEG records were obtained from healthy younger and healthy older adults before, during, and after they performed a 13-minute Continuous Performance Task. Factor analyses were conducted on each five-second segment of EEG data by treating the voltages obtained at each electrode site as variables and each measurement epoch as a case. Results showed that the EEG records of older adults yielded significantly more factors than those of younger adults in every task condition. In addition, eigenvalues for the first common factor derived from EEG data sets were significantly larger in the EEG recordings of younger adults than older adults. The results are interpreted to indicate a greater degree of complexity in the spatial distribution of EEG activity in older adults, possibly reflecting an age-related decrease in the degree of coordination among cortical areas.