Examining an Alternative Scoring Procedure for a Clinical Working Memory Measure

The Digit Span test is a widely used working memory measure. However, when using standardized scoring procedures, previous studies have demonstrated inconsistent relationships between Digit Span subtests and working memory measures frequently used in cognitive psychology experiments. Partial scoring involves awarding credit for all digits recalled in the correct serial location, whereas traditional scoring involves only awarding credit for a trial if all digits are recalled in the correct serial location. The current study compared the traditional all-or-nothing scoring method and the partial scoring method on Digit Span with other working memory measures and with measures of general fluid intelligence. The results showed that when differences were found, partial scoring was associated with stronger relationships with Digit Span Backwards but weaker relationships with Digit Span Forward and Sequencing compared with traditional scoring. These results support previous findings identifying differences between the Digit Span subtests and the utility of examining traditional scoring procedures.

A-028 Utilizing Virtual Reality to Assess the Relationship between Prospective Memory and Processing Speed

Objective Processing speed may partially mediate age-related differences in prospective memory (PM) abilities (West & Craik, 2001). The present preliminary study aimed to further investigate the relationships between prospective memory and processing speed by utilizing a novel virtual reality-based prospective memory measure. The task was designed to assess the impacts of a virtual environment would facilitate a deeper level of processing and enhance prospective memory performance. Method 49 older adults (M = 73.87, SD = 8.24) and 39 younger adults(M = 18.87, SD =1.61) completed the Coding subtest of the Weschler Adult Intelligence Scale (WAIS- IV) as well as a virtual-reality prospective memory measure that utilized both time-based and event-based cues. Results Coding was strongly correlated with PM time-based cues (r = .43, p < .01) and event-based cues (r = .53, p < .001). There were no correlations between processing speed and prospective memory in the young adult sample. Conclusion This study suggests that processing speed is strongly related to virtual-reality based PM and suggests that processing speed is a crucial component in prospective memory outcomes in older adults. This novel task virtual reality task may provide construct validity against other prospective memory measures.

Verbal working memory resources and comprehension of relative clauses in children with cochlear implants

Verbal working memory resources may impact syntax comprehension. Thirteen Italian children with cochlear implants (CIs) were assessed in relative clause (RC) comprehension, digit span and nonword repetition and compared to 13 chronological age peers (CA) and 13 younger controls (LA) with normal hearing (NH). The RC comprehension task tested subject relatives (SR), object relatives with preverbal (OR) and postverbal subjects (ORp) where number features were manipulated. Children with CIs show worse performance than controls in RC comprehension and nonword repetition. In the RC task, number features facilitated comprehension by children with NH, but not by children with CIs. The memory measure that predicted RC comprehension was digit span. In the LA group, backward digit span predicted comprehension of all RC types. Forward digit span predicted comprehension of ORs with number mismatch in the CA group, and comprehension of ORs with number mismatch and ORps in children with CIs. In these conditions, high memory resources are needed to exploit number features in theta-role assignment.

TASK-SPECIFIC METACOGNITIVE ACCURACY DECLINES ACROSS THE DEMENTIA-ALZHEIMER’S TYPE SPECTRUM

Subjective cognitive complaints (SCCs) remain part of the diagnostic criteria for amnestic mild cognitive impairment (aMCI), the prodromal stage of dementia - Alzheimer’s type (DAT), despite weak relationships between self-reported and objectively-measured functioning. Most metacognitive measures focus on ratings of global retrospective memory rating only; greater subtlety in measurement of SCCs is required. Similarly, it is critical to identify the disease stage at which the clinical utility of SCCs is nullified by impaired insight. This study aims to evaluate group differences in (a) task-specific metacognitive ratings, and (b) the accuracy of these ratings in individuals diagnosed as cognitively intact (CI), with aMCI, or with DAT. 99 older adults (M-age = 69.43, SD-age = 6.98; M-edu = 15.54, SD-edu = 2.47; CI: n = 50, aMCI: n = 34, DAT: n = 15) enrolled in the University of Michigan Memory and Aging Project rated their performance on the Object Location Touchscreen Task (OLTT), an ecologically valid memory measure. One-way analysis of variance (ANOVA) revealed that individuals with aMCI-multiple domain or DAT rated their memory performance similarly to CI individuals, though the aMCI-single domain group rated themselves as more impaired. Bivariate Pearson’s r correlations demonstrated a decline in the strength of the relationship between task-specific metacognitive ratings and actual OLTT memory performance with increasing diagnostic severity. These findings suggest a decline in insight on task-specific memory ratings across the DAT spectrum, and call into question the use of self-reported SCCs as a diagnostic tool in later stages of disease progression.

Informant Personality Is Associated With Ratings of Memory Problems in Older Adults

Memory complaints are a key diagnostic criterion for dementia and mild cognitive impairment. Rating scales can be used to capture information about individuals’ memory problems from informants such as family members. However, problems with scale reliability suggest that individual differences influence the ratings informants provide. This project tested whether informants’ neuroticism was associated with their ratings of an older adult’s memory. In an online study, 293 volunteers completed a Five-Factor Personality Questionnaire and used 2 memory questionnaires to provide ratings of memory problems in an older individual they knew well. Rater neuroticism correlated positively with estimates of memory problems: More neurotic informants provided higher estimates of memory difficulties in the person they were rating. A second study replicated this finding with 786 volunteers and another widely used memory measure, the AD8. In both studies, exploratory analyses suggested the effect size was large enough to impact on clinical practice.

Validity and Normative Data for the Biber Figure Learning Test: A Visual Supraspan Memory Measure

The Biber Figure Learning Test (BFLT), a visuospatial serial figure learning test, was evaluated for biological correlates and psychometric properties, and normative data were generated. Nondemented individuals ( n = 332, 73 ± 7, 41% female) from the Vanderbilt Memory & Aging Project completed a comprehensive neuropsychological protocol. Adjusted regression models related BFLT indices to structural brain magnetic resonance imaging and cerebrospinal fluid (CSF) markers of brain health. Regression-based normative data were generated. Lower BFLT performances (Total Learning, Delayed Recall, Recognition) related to smaller medial temporal lobe volumes and higher CSF tau concentrations but not CSF amyloid. BFLT indices were most strongly correlated with other measures of verbal and nonverbal memory and visuospatial skills. The BFLT provides a comprehensive assessment of all aspects of visuospatial learning and memory and is sensitive to biomarkers of unhealthy brain aging. Enhanced normative data enriches the clinical utility of this visual serial figure learning test for use with older adults.

Retirement and memory in Europe

ABSTRACTWe investigate the effect of retirement on memory using the Survey on Health, Ageing and Retirement in Europe (SHARE). The availability of a panel data-set allows individual heterogeneity to be controlled for when estimating the effect of transitions into retirement on a commonly employed memory measure, word recall. We control for endogeneity of the retirement decision applying an instrumental variable technique to our fixed-effects transformation. Our main finding is that, conditional on the average non-linear memory age path of the typical individual, time spent in retirement has a positive effect on word recall.