Individual differences in rates of change in cognitive abilities of older persons.

The authors examined change in cognitive abilities in older Catholic clergy members. For up to 6 years, participants underwent annual clinical evaluations, which included a battery of tests from which summary measures of 7 abilities were derived. On average, decline occurred in each ability and was more rapid in older persons than in younger persons. However, wide individual differences were evident at all ages. Rate of change in a given domain was not strongly related to baseline level of function in that domain but was moderately associated with rates of change in other cognitive domains. The results suggest that change in cognitive function in old age primarily reflects person-specific factors rather than an inevitable developmental process. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sex differences in the personality and cognitive correlates of spatial ability.

D. J. Ozer (see PA, Vol 74:33989) found that spatial visualization correlated with personality and verbal ability for girls but not for boys. To account for this finding, he hypothesized that "the causes of individual differences in spatial visualization [may be] different for the two sexes" (Ozer, 1987, p. 134). Although Ozer's conclusion is an intriguing one, it should be viewed with at least some skepticism until the discrepancies between his data and those of other researchers have been reconciled. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Individual differences in lateralization: effects of gender and handedness

Representative genomes from each of the three kingdoms of life are compared in terms of protein structure, in particular, those of Haemophilus influenzae (a bacteria), Methanococcus jannaschii (an archaeon), and yeast (a eukaryote). The comparison is in the form of a census (or comprehensive accounting) of the relative occurrence of secondary and tertiary structures in the genomes, which particular emphasis on patterns of supersecondary structure. Comparison of secondary structure shows that the three genomes have nearly the same overall secondary-structure content, although they differ markedly in amino acid composition. Comparison of super-secondary structure, using a novel "frequent-words" approach, shows that yeast has a preponderance of consecutive strands (e.g. beta-beta-beta patterns), Haemophilus, consecutive helices (alpha-alpha-alpha), and Methanococcus, alternating helix-strand structures (beta-alpha-beta). Yeast also has significantly more helical membrane proteins than the other two genomes, with most of the differences concentrated in proteins containing two transmembrane segments. Comparison of tertiary structure (by sequence matching and domain-level clustering) highlights the substantial duplication in each genome (approximately 30% to 50%), with the degree of duplication following similar patterns in all three. Many sequence families are shared among the genomes, with the degree of overlap between any two genomes being roughly similar. In total, the three genomes contain 148 of the approximately 300 known protein folds. Forty-five of these 148 that are present in all three genomes are especially enriched in mixed super-secondary structures (alpha/beta). Moreover, the five most common of these 45 (the "top-5") have a remarkably similar super-secondary structure architecture, containing a central sheet of parallel strands with helices packed onto at least one face and beta-alpha-beta connections between adjacent strands. These most basic molecular parts, which, presumably, were present in the last common ancestor to the three Kingdoms, include the TIM-barrel, Rossmann, flavodoxin, thiamin-binding, and P-loop-hydrolase folds.     

Individual differences in cognitive processes.

Studied the effects of verbal ability and sex on performance in a simultaneous matching task. The 537 undergraduates who participated were administered the verbal battery of the Lorge-Thorndike Intelligence Test. Ss with high-verbal ability (high verbals) were much faster than Ss with low-verbal ability (low verbals) in making taxonomic category identity matches and homophone identity matches. Results suggest that verbal ability is related to the speed of retrieval from long-term memory. In addition, high verbals were faster in making physical identity word matches, suggesting that either lexicographically coded information stored in long-term memory is used in such a task or that verbal ability is also related to the speed of retrieval from short-term memory. As expected, males did not differ from females in the time they required to perform any of the matching tasks, although males made slightly more errors. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Individual differences in cognitive arithmetic.

Investigated the convergence of mental processes assessed by paper-and-pencil measures defining the Numerical Facility factor and component processes for cognitive arithmetic identified by using chronometric techniques. 100 undergraduates responded to 320 arithmetic problems in a true–false reaction-time (RT) verification paradigm and were administered a battery of ability measures spanning Numerical Facility, Perceptual Speed, and Spatial Relations factors. The 320 cognitive arithmetic problems comprised 80 problems of each of 4 types: simple addition, complex addition, simple multiplication, and complex multiplication. Information-processing results indicate that regression models that included a structural variable consistent with memory network retrieval of arithmetic facts were the best predictors of RT to each of the 4 types of arithmetic problems. Generally, results provide evidence for continuity of intellectual abilities identified with the use of factor-analytic methods and elementary component processes isolated with the use of RT techniques. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Individual differences in working memory within a nomological network of cognitive and perceptual speed abilities.

It has become fashionable to equate constructs of working memory (WM) and general intelligence (g). Few investigations have provided direct evidence that WM and g measures yield similar ordering of individuals. Correlational investigations have yielded mixed results. The authors assess the construct space for WM and g and demonstrate that WM shares substantial variance with perceptual speed (PS) constructs. Thirty-six ability tests representing verbal, numerical, spatial, and PS abilities; the Raven Advanced Progressive Matrices; and 7 WM tests were administered to 135 adults. A nomological representation for WM is provided through a series of cognitive and PS ability models. Construct overlap between PS and WM is further investigated with attention to complexity, processing differences, and practice effects. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Individual differences in latent neuropsychological abilities at addictions treatment entry.

The latent structure of neuropsychological abilities and risk factors for impairment were examined in 197 persons entering addictions treatment. Confirmatory factor analysis yielded 4 factors: Executive, Memory, Verbal, and Processing Speed. The measurement model was consistent with evidence that neuropsychological test performance is factorially complex and supported by multiple brain regions. Path analyses showed that risk factors explained 34-57% of the true variance in abilities. Age, education, and medical status had the most generalized and robust associations with abilities. Drug use disorder diagnoses, childhood behavior problems, familial alcoholism, and psychopathology were also significantly related to specific latent abilities. Knowledge of neuropsychological impairment may be clinically useful, and selected risk factors may help treatment providers decide which clients should receive formal neuropsychological assessment. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sex differences in brain and personality correlates of the ability to identify popular word associations.

The ability of men to identify popular word associations had earlier been shown to be affected by left-sided thalamic surgery for movement disorders; now, over a year later, the impairment has been observed with operations on both sides. In addition, upon testing at approximately the same time interval, men who had undergone temporal lobe surgery for epilepsy have also shown the impairment. In contrast, women have improved after the operations. The Word Association Test (WAT) requires a subject to identify popular word associations to 54 words. In a large group of unoperated subjects, the errors on the WAT were greater for men than for women, although the men scored higher on the Wechsler-Bellevue Intelligence Scale (WB). WAT scores were found to correlate with scores on the WB and the Minnesota Multiphasic Personality Inventory (MMPI), and the WAT scores of the men tended to show a higher correlation with these measures than did those of the women. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Individual differences in need for cognitive closure

This article introduces an individual-difference measure of the need for cognitive closure. As a dispositional construct, the need for cognitive closure is presently treated as a latent variable manifested through several different aspects, namely, desire for predictability, preference for order and structure, discomfort with ambiguity, decisiveness, and close-mindedness. This article presents psychometric work on the measure as well as several validation studies including (a) a "known-groups" discrimination between populations assumed to differ in their need for closure, (b) discriminant and convergent validation with respect to related personality measures, and (c) replication of effects obtained with situational inductions of the need for closure. The present findings suggest that the Need for Closure Scale is a reliable and valid instrument of considerable potential utility in future "motivated social cognition" research.     

Sex differences in cerebral organization for speech and praxic functions.

A retrospective study on incidence of aphasia and apraxia was done on 143 male (mean age 50.4 yrs) and 73 female (mean age 45.7 yrs) right-handed patients with unilateral lesions of the left cerebral hemisphere and on a subgroup of 81 patients with damage restricted to anterior or posterior regions. Aphasia was proportionally more frequent in males than in females, but this difference was significant only in the larger sample. Moreover, the pattern of speech representation differed between the sexes: Speech disorders and manual apraxia occurred in females more often from damage to the anterior part of the left hemisphere than from posterior damage. This was not true for males. In the 169 Ss with unilateral right-hemisphere damage, the incidence of aphasia was extremely low and did not differentiate the sexes. It is concluded that there are sex differences in the organization of speech and praxis within the left hemisphere and that speech is not simply more bilaterally organized in females than males. (French abstract) (29 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Uncertainty orientation and trust in close relationships: Individual differences in cognitive styles.

Because coping with uncertainty is an important aspect of close relationships and is critical to issues of trust, the authors expected individual differences in uncertainty orientation to play a central role in shaping people's representations of their relationships. For a 3-week period, 77 couples completed a series of questionnaires and kept diaries on their interactions. As expected, certainty-oriented persons' need for cognitive closure resulted in either high or low trust for their partners, whereas uncertainty-oriented persons typically attained only a moderate level of trust. Several other measures indicated that certainty-oriented partners found their relationships most aversive under moderate trust. Memory data indicated that certainty-oriented individuals, but not uncertainty-oriented individuals, used conclusions about trust as a heuristic for reconstructing the past in ways that maintained cognitive clarity. Uncertainty orientation also combined with gender in many interesting ways. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The need and ability to achieve cognitive structuring: Individual differences that moderate the effect of stress on information processing.

The authors examined the hypothesis that the interaction between the need for cognitive structure (NCS) and the ability to achieve cognitive structure (AACS) moderates the effect of stress on information processing. NCS is the preference for using cognitive structuring, as opposed to piecemeal processes, as a means to achieve certainty. AACS is the extent to which individuals are able to apply information processes that are consistent with their levels of NCS. The hypothesis was validated in 4 studies, which showed that stress increased high-AACS participants' use of cognitive structuring if they had high NCS and reduced it if they had low NCS. An opposite effect was found for low-AACS participants. The implications of these results for the understanding of the mechanisms responsible for the effect of stress on information processing are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sex differences in episodic memory: The impact of verbal and visuospatial ability.

The impact of verbal and visuospatial ability on sex differences in episodic memory was investigated. One hundred men and 100 women, 20–40 years old, participated in a series of verbal and visuospatial tasks. Episodic memory was assessed in tasks that, to a greater or lesser extent, were verbal or visuospatial in nature. Results showed that women excelled in verbal production tasks and that men performed at a superior level on a mental rotation task. In addition, women tended to perform at a higher level than men on most episodic memory tasks. Taken together, the results demonstrated that (a) women perform at a higher level than men on most verbal episodic memory tasks and on some episodic memory tasks with a visuospatial component, and (b) women's higher performance on episodic memory tasks cannot fully be explained by their superior performance on verbal production tasks. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Adult attachment style and information processing: Individual differences in curiosity and cognitive closure.

Five studies examined the association between adult attachment style and information processing. Studies 1–2 focused on information search (curiosity-related beliefs and behaviors). Studies 3–5 focused on the integration of new information within cognitive structures; namely, the level of cognitive closure and its expressions in social judgments. Secure and anxious–ambivalent persons described themselves as more curious and held more positive attitudes toward curiosity than did avoidant persons. The competition between information search and social interaction increased information search among avoidant persons, but decreased it among anxious–ambivalent persons. Finally, secure persons reported less preference for cognitive closure and were more likely to rely on new information in making social judgments than avoidant and anxious–ambivalent persons. The theoretical implications of the link between attachment and information processing are discussed. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Dichotic listening performance, cognitive ability, and cerebral organization.

Explored linkages between dichotic listening performance, cognitive ability, and cerebral organization, addressing 3 main questions: (1) the relationship of sex, handedness, and familial sinistrality to auditory laterality and to selected aspects of cognitive performance; (2) the relationship between laterality and cognitive ability; and (3) the relationship between verbal and musical laterality. Two dichotic listening tests (one involving recognition of stop consonant-vowel syllables and the other, recognition of melodic patterns) were administered to 120 college students balanced for handedness, sex, and familial sinistrality. Ss also underwent psychometric tests. Results indicate an independence of verbal and nonverbal laterality effects and support a componential (modular) theory of brain organization rather than one of complementarity. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sex typing and androgyny in dyadic interaction: Individual differences in responsiveness to physical attractiveness.

In an expansion of the "behavioral confirmation" paradigm developed by M. Snyder et al (see record 1979-26014-001), 12 sex-typed and 12 androgynous (Bem Sex-Role Inventory) undergraduates of each sex engaged in getting-acquainted telephone conversations with allegedly attractive and unattractive members of their own and the opposite sex. Although females were more socially responsive than males, the sexes neither differed in their responsiveness to physical attractiveness nor in their responsiveness to cross-sex and same-sex interaction. As hypothesized, sex-typed individuals were rated by blind judges as being significantly more responsive toward allegedly attractive than unattractive partners. In contrast, androgynous men did not differentiate on the basis of physical attractiveness, and androgynous women actually led allegedly unattractive targets to be rated as more socially attractive than allegedly attractive targets, thereby disconfirming the physical attractiveness stereotype. Because cultural definitions of physical attractiveness are different for men and women, results are discussed in the context of recent evidence that sex-typed individuals have a particular readiness to encode and organize information in terms of gender. (22 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A model for representing gender differences in the pattern of cognitive abilities.

Comments on A. Feingold's (see record 1988-18577-001) meta-analytic assessment of gender-related performance on the Differential Aptitude Tests, which indicated a trend toward disappearing gender differences in the profile of cognitive abilities (CAs). In a review of potential explanatory models for this finding, the present author considers the mechanisms by which both biological and sociocultural factors might influence the developing pattern of human CAs. A satisfactory model might include the identification of a mechanism such as gender, and individual, differences in the frequency of engagement in sex-dimorphic behaviors. This model would predict a specific relationship between early activity patterns and the pattern of later CAs. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Thirty years of research on race differences in cognitive ability.

The culture-only (0% genetic-100% environmental) and the hereditarian (50% genetic-50% environmental) models of the causes of mean Black-White differences in cognitive ability are compared and contrasted across 10 categories of evidence: the worldwide distribution of test scores, g factor of mental ability, heritability, brain size and cognitive ability, transracial adoption, racial admixture, regression, related life-history traits, human origins research, and hypothesized environmental variables. The new evidence reviewed here points to some genetic component in Black-White differences in mean IQ. The implication for public policy is that the discrimination model (i.e., Black-White differences in socially valued outcomes will be equal barring discrimination) must be tempered by a distributional model (i.e., Black-White outcomes reflect underlying group characteristics). (PsycINFO Database Record (c) 2010 APA, all rights reserved)