Correlates of level and change in the Mini-Mental State Examination

The goal of the current project was to determine (a) the cognitive abilities assessed by the Mini Mental State Examination (MMSE; M. F. Folstein, S. E. Folstein, & P. R. McHugh, 1975), (b) whether the same abilities are associated with MMSE performance among people of different ages, and (c) whether the same abilities are involved in changes within the same people over time. The authors therefore examined whether the initial levels of 5 cognitive ability constructs (vocabulary, reasoning, memory, space, and speed) predicted initial levels of MMSE performance and whether the initial levels or the changes in these 5 cognitive abilities predicted change in the MMSE performance. The major findings were that 3 cognitive constructs (vocabulary, reasoning, and memory) contribute to performance in the MMSE but that their respective contributions to the MMSE vary as a function of age and time. In particular, individual differences and change in the MMSE are primarily related to individual differences in reasoning among adults younger than about 70 years, whereas both initial level of MMSE performance and longitudinal change in MMSE performance primarily related to initial level and change in memory ability among adults older than 70 years. The results therefore imply that both the level of performance on the MMSE at a single point in time and the change in MMSE over time may represent somewhat different cognitive abilities at different ages.     

Does it all go together when it goes? The nineteenth Bartlett memorial lecture

As groups of people age, the differences in the cognitive abilities of the most and least able become more extreme. This increase in between-individual variance is accompanied by an increase in within-individual variance: the difference between individuals' levels of performance on their best and least well retained skills. The implications of increasing between-individual variance are discussed in terms of the range of different factors that may affect cognitive ageing. Increases in within-individual variance are discussed in terms of differences betweeen “fluid” and “crystallized” abilities. The usefulness of this distinction and its functional implications are questioned. The hypothesis that age-related declines in “fluid” abilities are best modelled in terms of declines in a single factor is evaluated. Evidence is presented of disparate rates of decline, even of “fluid” cognitive abilities, such as performance on IQ tests, ability on information-processing tasks, and efficiency on memory tasks. Data from large-scale cross-sectional studies suggests that cognitive skills do not “all go together when they go”, but that there may, rather, be characteristic patterns, or syndromes, of cognitive ageing.     

Stratégies de contrôle adaptatives au fil de l’âge adulte et rôle des ressources cognitives dans leur déploiement

The current study investigated the age-related differences in control strategies deployment, and examined the relations of control strategies with indicators of well-being and cognitive efficiency. Eighty-five participants aged from 18 to 93 years old completed measures of control strategies and anxiety, and were administered several cognitive tests designed to assess processing speed, reasoning and episodic memory. Results showed that (1) middle-aged individuals use more control strategies based on emotional regulation and goal disengagement than younger and older individuals, (2) individuals who deploy more control strategies focused on emotions report lower levels of anxiety, and (3) cognitive resources moderate the relation between age and control strategies deployment. That is, although increased age is associated with lower deployment of control strategies, the current project showed that age effects in control strategies were weaker for people with higher levels of cognitive resources than for people with lower levels of cognitive resources.     

Engaging in cultural activities compensates for educational differences in cognitive abilities

ABSTRACT

The goal of the current project was to examine whether engagement in intellectual/cultural activities explains the long-term effects of education on cognitive abilities throughout adulthood, and whether it compensates for educational differences in cognitive abilities throughout adulthood. Participants between 18 and 96 years of age completed a comprehensive questionnaire about intellectual/cultural activities that they participated in and performed a wide variety of cognitive tests. There were no mediation effects of engagement in intellectual/cultural activities on the relationship between education and cognitive functioning. In contrast, engagement in intellectual/cultural activities was found to moderate the relations between education and the level of fluid ability, working memory, speed of processing, and episodic memory. Findings suggest that the risk of cognitive decline in people with less education can be reduced via engagement in intellectual and cultural activities throughout adulthood.     

Engaging in cultural activities compensates for educational differences in cognitive abilities

The goal of the current project was to examine whether engagement in intellectual/cultural activities explains the long-term effects of education on cognitive abilities throughout adulthood, and whether it compensates for educational differences in cognitive abilities throughout adulthood. Participants between 18 and 96 years of age completed a comprehensive questionnaire about intellectual/cultural activities that they participated in and performed a wide variety of cognitive tests. There were no mediation effects of engagement in intellectual/cultural activities on the relationship between education and cognitive functioning. In contrast, engagement in intellectual/cultural activities was found to moderate the relations between education and the level of fluid ability, working memory, speed of processing, and episodic memory. Findings suggest that the risk of cognitive decline in people with less education can be reduced via engagement in intellectual and cultural activities throughout adulthood.     

Subjective cognitive effort: a model of states, traits, and time

Self-regulation theories were used to develop a dynamic model of the determinants of subjective cognitive effort. The authors assessed the roles of malleable states and stable individual differences. Subjective cognitive effort and perceived difficulty were measured while individuals performed an air traffic control task. As expected, Conscientiousness moderated the effort trajectory. Individuals with high Conscientiousness maintained subjective cognitive effort at high levels for longer than their counterparts. There were also individual differences in reactions to perceptions of task difficulty. The intra-individual relationship between perceived difficulty and subjective cognitive effort was stronger for individuals with low ability or low Conscientiousness than for their counterparts. A follow-up study showed that the measures of perceived difficulty and subjective cognitive effort were sensitive to a task difficulty manipulation as well as that the relationship between perceived difficulty and subjective cognitive effort held after controlling for self-set goal level. These findings contribute to the self-regulation literature by identifying factors that influence changes in subjective cognitive effort during skill acquisition.     

Out of sight,out of mind? Relations between visual acuity and cognition

Prior research has established significant relations between measures of sensory ability and cognitive function in adults of different ages, and several explanations for this relation have been proposed. One explanation is that sensory abilities restrict cognitive processing, a second is that cognitive abilities influence assessments of sensory ability, and a third is that both sensory function and cognition are affected by a common, potentially age-based, third factor. These explanations were investigated using mediation and moderation analyses, with near visual acuity as the sensory measure and scores on visual speed tests and auditory memory tests as the cognitive measures. Measures of visual acuity, speed, and memory were obtained from three moderately large samples, two cross-sectional (N?=?380, N?=?4,779) and one longitudinal (N?=?2,258), with participants ranging from 18 to 90 years of age. The visual acuity and cognitive measures had different age trajectories, and the visual acuity–cognition relations were similar in each 5-year age band. The results suggest that the age-related differences and changes in near visual acuity are unlikely to contribute to the age-related differences and changes in speed and memory measures.     

Mental Exercise and Mental Aging

ABSTRACT— It is widely believed that keeping mentally active will prevent age-related mental decline. The primary prediction of this mental-exercise hypothesis is that the rate of age-related decline in measures of cognitive functioning will be less pronounced for people who are more mentally active, or, equivalently, that the cognitive differences among people who vary in level of mental activity will be greater with increased age. Although many training studies, and comparisons involving experts, people in specific occupations, and people whose mental activity levels are determined by their self-reports, have found a positive relation between level of activity and level of cognitive functioning, very few studies have found an interactive effect of age and mental activity on measures of cognitive functioning. Despite the current lack of empirical evidence for the idea that the rate of mental aging is moderated by amount of mental activity, there may be personal benefits to assuming that the mental-exercise hypothesis is true.     

The association between personality and cognitive ability: Going beyond simple effects

To examine the relationship between the Big Five and cognitive ability, we investigated whether we could replicate in a heterogeneous population sample the positive association between cognitive ability and Openness and Emotional Stability and its negative association with Conscientiousness. Besides analyzing the pure associations, we shed further light on sources of these associations by investigating potential moderating effects of education and labor force participation. Our results clearly replicate the previously found positive association between cognitive ability and Emotional Stability and Openness and the negative relationship between Conscientiousness and cognitive ability. The correlation between cognitive ability and Openness was found to be moderated by educational attainment, the negative association between Conscientiousness and cognitive ability was moderated by labor force participation.     

Une redéfinition des relations entre la personnalité « Ouverte à l’expérience » et l’intelligence

Previous investigations of the relations between the Big Five personality traits and cognitive abilities have consistently supported that higher levels of openness to experience are associated with higher levels of crystallized abilities or knowledge. However, consistent with the idea that crystallized abilities are the product of the exercise of fluid abilities in the past, a moderately strong correlation between both types of abilities is generally found. Then, the first purpose of the current project was to examine the role of fluid abilities in the relation between openness to experience and crystallized abilities. It aimed at determining whether the relation of openness to crystallized abilities was still significant after controlling for the specific contribution of fluid intelligence to crystallized abilities; or conversely, whether this relation was explained by the relation of openness to fluid intelligence. The second purpose was to determine if the relation of openness to experience to both fluid and crystallized abilities varied as a function of age. The possibility that openness to experience differentially contributes to the variance in fluid and crystallized abilities as a function of age was examined. One hundred and sixty-four participants, aged 18 to 96, completed the openness to experience scale (French version of the IPIP, Goldberg, 1999. Personality psychology in Europe), in addition to several tests of fluid and crystallized abilities. After controlling for the variance associated with fluid abilities in crystallized abilities, Openness to experience was not related to crystallized abilities anymore. Moreover, the contribution of the personality trait of Openness to the variation in fluid and crystallized intelligences was similar at different ages in adulthood. Several possible interpretations and their respective implications are discussed. First, people more open may exercise fluid abilities more than people who are less open, and then increase the efficiency of these abilities. Second, fluid abilities may influence the development of the personality trait of openness to experience, that is people's tendency to seek out for novelty and curiosity. And third, the openness to experience scale may only reflect people's self-assessments of their abilities, such as a self-assessed intelligence construct. In any case, our results strongly suggest that the openness-cognition relation reflects something different from a relation between activity and knowledge acquisition.     

Influence of social desirability on age differences in self-reports of mood and personality

ABSTRACT Increased age has been found to be associated with differences in affect and personality that have been interpreted in terms of better emotional regulation and increased maturity. However, these findings have largely been based on self-report data, and the primary goal of the current research was to investigate the hypothesis that age-related differences in affect and in certain desirable personality traits might, at least partially, reflect age differences in social desirability. As expected, increased age was associated with lower levels of negative affect and Neuroticism and higher levels of positive affect, life satisfaction, Agreeableness, and Conscientiousness, and scores on the social desirability scale were positively related to age and to desirable self-report characteristics but negatively related to undesirable self-report characteristics. Importantly, controlling for the variance in the social desirability measure resulted in less positive age trends in both types of self-report measures.     

Altruism and health outcomes in multiple sclerosis: The effect of cognitive reserve

Despite age-associated decreases in cognitive and physical abilities, age is not associated with a decrease in ratings of well-being; this phenomenon is termed the ‘paradox of well-being.’ One potential explanation for this paradox may be that older adults place less value on cognitive abilities that have been shown to decrease with age (e.g., memory) and more value on cognitive abilities shown to increase with age (e.g., knowledge). Using online methods, 358 individuals between the ages of 18 and 88 completed a survey assessing the values placed on everyday cognitive abilities, self-ratings for those same abilities, and life satisfaction. Results indicated that there were minimal age-related differences in values placed on everyday cognitive abilities and that values generally did not moderate the relationship between perceptions of cognitive functioning and life satisfaction. Of note, values placed on cognition significantly predicted life satisfaction in younger adults, but not in middle-aged and older adults.     

Personality predicts prospective memory task performance: an adult lifespan study

Do interindividual differences in prospective memory task performance reflect individual differences in personality and lifestyle? Do the cognitive abilities known to change with age retain their power to predict episodic prospective memory task performance after controlling for personality and lifestyle variables, and do personality and lifestyle variables offer predictive power apart from that provided by cognitive ability measures? To answer these questions, we conducted a study with community‐living healthy individuals (n= 141) between 18 and 81 years of age. They completed three different episodic prospective memory tasks – two laboratory tasks and one field task – as well as various measures of personality, lifestyle, and cognitive ability. The results indicated that personality and lifestyle reliably predicted who will succeed and who will fail on all three episodic prospective memory tasks. Conscientiousness predicted performance on two of the prospective memory tasks; socially prescribed perfectionism and neuroticism each predicted performance on one of the prospective memory tasks. Cognitive ability predicted performance on one of the laboratory prospective memory tasks but not on the other two prospective memory tasks. After we controlled for individual differences in personality and lifestyle variables, cognitive ability was no longer able to predict performance on the laboratory prospective memory task. By contrast, controlling for cognitive ability had no influence on the predictive power of the personality and lifestyle variables.     

Age-related differentiation of cognitive abilities in ages 3–7

One important issue in the study of individual differences in cognitive abilities has been the question whether abilities tend to become more differentiated with increasing age. The present study examines age-related differentiation in the structure of cognitive abilities among children 3–7 years of age, using data from the recently undertaken Swedish standardisation of the Wechsler Preschool and Primary Scale of Intelligence-Revised. A confirmatory factor analytic modelling approach is applied. Models of different factor structure are built, evaluated and tested against empirical data using the LISREL 8 and the Mplus2 programs run under the STREAMS modelling environment. The results provide support for the notion that cognitive abilities show increasing differentiation with increasing age.     

Where cognitive development and aging meet: face learning ability peaks after age 30

Research on age-related cognitive change traditionally focuses on either development or aging, where development ends with adulthood and aging begins around 55 years. This approach ignores age-related changes during the 35 years in-between, implying that this period is uninformative. Here we investigated face recognition as an ability that may mature late relative to other abilities. Using data from over 60,000 participants, we traced the ability to learn new faces from pre-adolescence through middle age. In three separate experiments, we show that face learning ability improves until just after age 30 – even though other putatively related abilities (inverted face recognition and name recognition) stop showing age-related improvements years earlier. Our data provide the first behavioral evidence for late maturation of face processing and the dissociation of face recognition from other abilities over time demonstrates that studies on adult age development can provide insight into the organization and development of cognitive systems.     

抑制和加工速度与液态智力的年老化

研究抑制能力和加工速度在液态智力年老化过程中的相对作用。被试为142名18~85岁健康成年人,完成包括抑制优势反应、加工速度和液态智力共13项测验。分层回归分析显示,抑制能力与年龄相关的特异性变异,在控制简单的速度变量时较控制复杂的速度变量时更大;结构方程分析表明,对液态智力年老化的中介作用,当选取较复杂的速度变量时加工速度的作用更大,而当选取较简单的速度变量时抑制能力的作用更大。研究结果表明,在液态智力的年老化过程中,除了加工速度的作用之外,抑制能力也起重要的中介作用。该结果为认知年老化的抑制理论和执行衰退假说提供了认知行为学研究的证据,并且对加工速度理论作了有益的补充和修正     

Comparability of Self‐Reported Conscientiousness Across 21 Countries

In cross‐national studies, mean levels of self‐reported phenomena are often not congruent with more objective criteria. One prominent explanation for such findings is that people make self‐report judgements in relation to culture‐specific standards (often called the reference group effect), thereby undermining the cross‐cultural comparability of the judgements. We employed a simple method called anchoring vignettes in order to test whether people from 21 different countries have varying standards for Conscientiousness, a Big Five personality trait that has repeatedly shown unexpected nation‐level relationships with external criteria. Participants rated their own Conscientiousness and that of 30 hypothetical persons portrayed in short vignettes. The latter type of ratings was expected to reveal individual differences in standards of Conscientiousness. The vignettes were rated relatively similarly in all countries, suggesting no substantial culture‐related differences in standards for Conscientiousness. Controlling for the small differences in standards did not substantially change the rankings of countries on mean self‐ratings or the predictive validities of these rankings for objective criteria. These findings are not consistent with mean self‐rated Conscientiousness scores being influenced by culture‐specific standards. The technique of anchoring vignettes can be used in various types of studies to assess the potentially confounding effects of reference levels. Copyright © 2011 John Wiley & Sons, Ltd.     

Structural Imaging Measures of Brain Aging

During the course of normal aging, biological changes occur in the brain that are associated with changes in cognitive ability. This review presents data from neuroimaging studies of primarily “normal” or healthy brain aging. As such, we focus on research in unimpaired or nondemented older adults, but also include findings from lifespan studies that include younger and middle aged individuals as well as from populations with prodromal or clinically symptomatic disease such as cerebrovascular or Alzheimer’s disease. This review predominantly addresses structural MRI biomarkers, such as volumetric or thickness measures from anatomical images, and measures of white matter injury and integrity respectively from FLAIR or DTI, and includes complementary data from PET and cognitive or clinical testing as appropriate. The findings reveal highly consistent age-related differences in brain structure, particularly frontal lobe and medial temporal regions that are also accompanied by age-related differences in frontal and medial temporal lobe mediated cognitive abilities. Newer findings also suggest that degeneration of specific white matter tracts such as those passing through the genu and splenium of the corpus callosum may also be related to age-related differences in cognitive performance. Interpretation of these findings, however, must be tempered by the fact that comorbid diseases such as cerebrovascular and Alzheimer’s disease also increase in prevalence with advancing age. As such, this review discusses challenges related to interpretation of current theories of cognitive aging in light of the common occurrence of these later-life diseases. Understanding the differences between “Normal” and “Healthy” brain aging and identifying potential modifiable risk factors for brain aging is critical to inform potential treatments to stall or reverse the effects of brain aging and possibly extend cognitive health for our aging society.     

Task control and cognitive abilities of self and spouse in collaboration in middle-aged and older couples

Collaborative problem solving may be used by older couples to optimize cognitive functioning, with some suggestion that older couples exhibit greater collaborative expertise. The study explored age differences in 2 aspects of collaborative expertise: spouses' knowledge of their own and their spouse's cognitive abilities and the ability to fit task control to these cognitive abilities. The participants were 300 middle-aged and older couples who completed a hypothetical errand task. The interactions were coded for control asserted by husbands and wives. Fluid intelligence was assessed, and spouses rated their own and their spouse's cognitive abilities. The results revealed no age differences in couple expertise, either in the ability to predict their own and their spouse's cognitive abilities or in the ability to fit task control to abilities. However, gender differences were found. Women fit task control to their own and their spouse's cognitive abilities; men only fit task control to their spouse's cognitive abilities. For women only, the fit between control and abilities was associated with better performance. The results indicate no age differences in couple expertise but point to gender as a factor in optimal collaboration.     

The sensory‐cognition association in adulthood: Different magnitudes for processing speed,inhibition, episodic memory,and false memory?

One hundred and forty-six participants (age range = 20-80) completed a battery of tests designed to measure visual acuity, processing speed, inhibition, episodic memory and false memory. The relations between visual acuity and general cognitive ability, as well as between visual acuity and the indicators of this construct, were evaluated with structural equation modeling. The measurement model confirmed that the indicators of the individual cognitive abilities could be grouped into a general cognitive functioning factor. However, the relation between episodic and false memory was not completely explained by the shared association with this general factor. Furthermore, visual acuity predicted approximately half of the age-related variance in the general cognition factor. Also, the proportion of age-related variance shared with vision was highest in inhibition and lowest in false memory. The results are discussed in the light of common cause accounts of cognitive aging.