Cognitive Plasticity and Cortical Modules

ABSTRACT— Some organisms learn to calculate, accumulate knowledge, and communicate in ways that others do not. What factors determine which intellectual abilities a particular species or individual can easily acquire? I propose that cognitive-skill learning capacity reflects (a) the availability of specialized cortical circuits, (b) the flexibility with which cortical activity is coordinated, and (c) the customizability of cortical networks. This framework can potentially account for differences in learning capacity across species, individuals, and developmental stages. Understanding the mechanisms that constrain cognitive plasticity is fundamental to developing new technologies and educational practices that maximize intellectual advancements.     

Naïve definitions of action and inaction: The continuum,spread, and valence of behaviors

The cohesiveness of a society depends, in part, on how its individual members manage their daily activities with respect to the goals of that society. Hence, there should be a degree of social agreement on what constitutes action and what constitutes inaction. The present research investigated the structure of action and inaction definitions, the evaluation of action versus inaction, and individual differences in these evaluations. Action–inaction ratings of behaviors and states showed more social agreement at the ends of the inaction–action continuum than at the middle, suggesting a socially shared construal of this definition. Action–inaction ratings were also shown to correlate with the valence of the rated behaviors, such that the more active the behavior, the more positive its valence. Lastly, individual differences in locomotion, need for closure, and Christian religious beliefs correlated positively with a preference for action. Copyright © 2011 John Wiley & Sons, Ltd.     

Being active and impulsive: The role of goals for action and inaction in self-control

Although self-control often requires behavioral inaction (i.e., not eating a piece of cake), the process of inhibiting impulsive behavior is commonly characterized as cognitively active (i.e., actively exerting self-control). Two experiments examined whether motivation for action or inaction facilitates self-control behavior in the presence of tempting stimuli. Experiment 1 used a delay discounting task to assess the ability to delay gratification with respect to money. Experiment 2 used a Go/No-Go task to assess the ability to inhibit a dominant but incorrect motor response to the words ??condom?? and ??sex??. The results demonstrate that goals for inaction promote self-control, whereas goals for action promote impulsive behavior. These findings are discussed in light of recent evidence suggesting that goals for action and inaction modulate physiological resources that promote behavioral execution.     

Gender differences in children's divergent thinking

Block's theory (1984) of gender differences was examined to determine if it could explain inconsistencies in the reports of gender differences and the personality correlates of creativity in children. Additionally, an investigation of 244 gifted children in grades 4 to 8 is described. Two divergent thinking tests, each with a familiar and an unfamiliar item, were used to test cognitive style. The Dependency Proneness Test was used to measure independence, and the Fundamental Interpersonal Relations Orientation‐Behavior Children was used to measure social orientation. No gender differences were found on the measures of personality and cognitive style, and no significant association was found between cognitive style and personality. The results were discussed in light of the moderating influence of sex‐role flexibility and the relative freedom boys and girls experience in peer groups and play.     

Why are Wise People Happier? An Explanatory Model of Wisdom and Emotional Well-Being in Older Adults

This research investigated the relation between wisdom and emotional well-being in older adults, with an aim to elucidate pathways of positive development in adulthood. Three-hundred and sixty recently retired individuals completed a series of questionnaires including measures of wisdom, dispositional coping, perceived control, life engagement, and positive and negative affect. Structural equation modeling controlling for social desirability, health, and sociodemographic variables revealed that problem-focused coping, positive reappraisal coping, perceived control and life engagement mediate the positive relation between wisdom and positive affect. In addition, perceived control and life engagement, but not dispositional coping, were found to mediate the negative relation between wisdom and negative affect. The results demonstrate that higher levels of perceived control and life engagement in conjunction with an increased use of problem-focused and positive reappraisal coping account for the enhanced emotional well-being associated with wisdom. Findings are discussed in terms of the characteristics of wise individuals that promote positive aging.     

Phonological coding in reading comprehension: The importance of individual differences

Abstract

In two experiments, texts were presented word by word at a fixed pace to subjects high or low in test anxiety, under various concurrent interference conditions: no interference, articulatory suppression, finger tapping, unattended meaningful speech, reversed (meaningless) speech and nonword (meaningless) speech. High-anxiety subjects produced overt articulation more frequently than low-anxiety subjects, especially in the speech conditions. There was an interaction between anxiety and interference on comprehension performance: Conditions thought to interfere with phonological coding (i.e. articulatory suppression and nonword speech) were detrimental to comprehension for high but not for low-anxiety subjects; in contrast, there were no differences in comprehension performance as a function of anxiety under conditions causing no (proper) phonological interference (i.e. no interference, finger tapping and reversed speech). There were mixed results in the meaningful speech condition, partly attributable to its semantic interference component. These findings reveal that the use and importance of phonological coding in reading comprehension vary with differences in test anxiety-high-anxiety subjects are vulnerable to disruptive effects on phonological coding. This suggests that high-anxiety individuals are especially likely to resort to speech-based coding during reading, and that phonological coding has a compensatory role for them.     

Mood congruent Bias in Interpretation of Ambiguity Strategic Processes and Temporary Activation

Three experimentsinvestigated the tendency of high-anxiety individuals to interpretambiguous information in a threatening fashion. Priming ambiguous sentences (concerned with ego-threat, physical-threat, or non-threat events) were presented, followed by a disambiguating sentence in which a target word either confirmed or disconfirmed the consequence implied by the priming context. The sentences were presented word-by-word at a predetermined pace. Subjects read the sentences and pronounced the target word (naming task), which appeared either 500 msec or 1,250 msec after the onset of the last word (pre-target word) in the priming context. Results indicated that high-anxiety subjects named target words confirming threats faster than low-anxiety subjects, relative to non-threat words. Furthermore, this interpretative bias is: (a) strategic, rather than automatic, as it occurred with a 1,250-msec SOA, but not with a 500-msec SOA; (b) temporary, as it was found under evaluative stress conditions increasing state anxiety, butnot withnon-stress; and (c) specificto ego-threats, as it happened with ambiguous information concerning self-esteem and social evaluation, rather than with physical-threat-related information.     

Youth at Risk: In Search of a Definition

The term youth at risk has been defined in numerous ways. A review of these definitions, their perspectives on predisposing conditions, and the implications for counseling are discussed.     

Modeling possible effects of atypical cerebellar processing on eyeblink conditioning in autism

Autism is unique among other disorders in that acquisition of conditioned eyeblink responses is enhanced in children, occurring in a fraction of the trials required for control participants. The timing of learned responses is, however, atypical. Two animal models of autism display a similar phenotype. Researchers have hypothesized that these differences in conditioning reflect cerebellar abnormalities. The present study used computer simulations of the cerebellar cortex, including inhibition by the molecular layer interneurons, to more closely examine whether atypical cerebellar processing can account for faster conditioning in individuals with autism. In particular, the effects of inhibitory levels on delay eyeblink conditioning were simulated, as were the effects of learning-related synaptic changes at either parallel fibers or ascending branch synapses from granule cells to Purkinje cells. Results from these simulations predict that whether molecular layer inhibition results in an enhancement or an impairment of acquisition, or changes in timing, may depend on (1) the sources of inhibition, (2) the levels of inhibition, and (3) the locations of learning-related changes (parallel vs. ascending branch synapses). Overall, the simulations predict that a disruption in the balance or an overall increase of inhibition within the cerebellar cortex may contribute to atypical eyeblink conditioning in children with autism and in animal models of autism.