Gray matter correlates of fluid,crystallized, and spatial intelligence: Testing the P-FIT model

The parieto-frontal integration theory (P-FIT) nominates several areas distributed throughout the brain as relevant for intelligence. This theory was derived from previously published studies using a variety of both imaging methods and tests of cognitive ability. Here we test this theory in a new sample of young healthy adults (N = 100) using a psychometric battery tapping fluid, crystallized, and spatial intelligence factors. High resolution structural MRI scans (3T) were obtained and analyzed with Voxel-based Morphometry (VBM). The main findings are consistent with the P-FIT, supporting the view that general intelligence (g) involves multiple cortical areas throughout the brain. Key regions include the dorsolateral prefrontal cortex, Broca's and Wernicke's areas, the somato-sensory association cortex, and the visual association cortex. Further, estimates of crystallized and spatial intelligence with g statistically removed, still share several brain areas with general intelligence, but also show some degree of uniqueness.     

Fluid intelligence, memory span, and temperament difficulties predict academic performance of young adolescents

There are several candidate measures when asking which psychological construct significantly predicts academic performance. Hundreds of studies have addressed this issue by measuring intelligence, basic cognitive processes, or personality. However, the simultaneous consideration of a broad and varied array of measures is much less common. Here we consider several cognitive and personality measures concurrently to define latent factors representing six constructs of presumed interest: fluid intelligence, short-term memory, working memory, processing speed, controlled attention, and temperament difficulties. One hundred and thirty-five secondary school students were tested. Their academic performance was measured by average grades in the nine scholastic areas of their curriculum. The main finding shows that a latent factor defined by fluid intelligence and memory span along with a latent factor defined by impulsiveness, sensation seeking, and lack of fear account for an impressive figure of 60% of the variance in academic performance.     

Memory for details with self-referencing

Self-referencing benefits item memory, but little is known about the ways in which referencing the self affects memory for details. Experiment 1 assessed whether the effects of self-referencing operate only at the item, or general, level or whether they also enhance memory for specific visual details of objects. Participants incidentally encoded objects by making judgements in reference to the self, a close other (one's mother), or a familiar other (Bill Clinton). Results indicate that referencing the self or a close other enhances both specific and general memory. Experiments 2 and 3 assessed verbal memory for source in a task that relied on distinguishing between different mental operations (internal sources). The results indicate that self-referencing disproportionately enhances source memory, relative to conditions referencing other people, semantic, or perceptual information. We conclude that self-referencing not only enhances specific memory for both visual and verbal information, but can also disproportionately improve memory for specific internal source details.     

Generation of a new Space

This paper addresses a significant gender issue in the Chinese religious culture of Taiwan. The exclusion of deceased maidens from family and ancestral lineages leaves relations between the living and the dead disordered. People believe that homeless maidens become restless, polluting ghosts after death who will bring misfortune to their family and others in society. The case study examined here is a correction to the exclusion/pollution/homelessness of maiden-spirits through ‘adoption’ in the maiden-temple of Sam-giap. I will analyse how spirit-adoption in the Sam-giap maiden-temple constitutes an attempt to correct that disorder and pollution. I will also argue that one result of the Sam-giap corrective practice is the generation of a new space for maiden-spirits in which a new category that disrupts the opposition of ghosts and ancestors emerges.     

Memory for details with self-referencing

Self-referencing benefits item memory, but little is known about the ways in which referencing the self affects memory for details. Experiment 1 assessed whether the effects of self-referencing operate only at the item, or general, level or whether they also enhance memory for specific visual details of objects. Participants incidentally encoded objects by making judgements in reference to the self, a close other (one's mother), or a familiar other (Bill Clinton). Results indicate that referencing the self or a close other enhances both specific and general memory. Experiments 2 and 3 assessed verbal memory for source in a task that relied on distinguishing between different mental operations (internal sources). The results indicate that self-referencing disproportionately enhances source memory, relative to conditions referencing other people, semantic, or perceptual information. We conclude that self-referencing not only enhances specific memory for both visual and verbal information, but can also disproportionately improve memory for specific internal source details.     

The Compromise Effect in Choosing for Others

Most research into the compromise effect focuses on cognitive factors related to choosing for oneself. However, there are daily opportunities to make choices for others, from helping friends to buy merchandise to choosing souvenirs for relatives. Although it is a common practice, choosing for others is rarely discussed in the literature. Hence, this research is directed to determine whether (i) the compromise effect is greater for people choosing for others with whom one has a distant relationship compared to choosing for themselves, (ii) the decision maker's susceptibility to interpersonal relationships, accountability, and anticipated regret moderate the relationship between choosing for others versus choosing for themselves and the compromise effect, and (iii) the confidence of the decision maker mediates the relationship between deciding for others and the compromise effect. Five hypotheses are proposed and they are supported by the results from four experiments. Copyright © 2011 John Wiley & Sons, Ltd.     

Speed of simple arithmetic in bilinguals

Four types of bilinguals solved simple addition problems that were auditorily presented in their preferred language, the language in which they first learned arithmetic, or in their nonpreferred language. Subjects responded in the language in which the problems were presented. Solution time averaged .227 sec faster in the preferred language and was an increasing linear function of the number of addition operations required. The intercepts of the preferred and nonpreferred language functions significantly differed, but the slopes did not. The preferred language advantage was attributed to faster encoding and/or response times in the preferred language. When bilinguals used only one of their languages in a given experimental session, encoding/response times in the two languages were equivalent and the preferred language advantage was eliminated.     

Stereotype Susceptibility: Identity Salience and Shifts in Quantitative Performance

Abstract—Recent studies have documented that performance in a domain is hindered when individuals feel that a sociocultural group to which they belong is negatively stereotyped in that domain. We report that implicit activation of a social identity can facilitate as well as impede performance on a quantitative task. When a particular social identity was made salient at an implicit level, performance was altered in the direction predicted by the stereotype associated with the identity. Common cultural stereotypes hold that Asians have superior quantitative skills compared with other ethnic groups and that women have inferior quantitative skills compared with men. We found that Asian-American women performed better on a mathematics test when their ethnic identity was activated, but worse when their gender identity was activated, compared with a control group who had neither identity activated. Cross-cultural investigation indicated that it was the stereotype, and not the identity per se, that influenced performance.     

The social construction of race: biracial identity and vulnerability to stereotypes

Multiracial individuals are more likely to have a heightened awareness of race as a social construct than monoracial individuals. This article examines the impact that a heightened awareness of race as a social construct has on the relationship between racial stereotypes and performance. Study 1 finds that multiracial individuals reported subscribing less to the notion that race biologically determines ability. Study 2 finds that monoracial individuals show stereotype activation, whereas multiracial individuals show stereotype inhibition in reaction to race salience. Study 3 draws on the work on stereotypes and performance to test the susceptibility of multiracial individuals to racial stereotypes about ability. The authors find that Asian/White and Black/White multiracial individuals were less susceptible to racial stereotypes than monoracial individuals. Whereas monoracial participants showed significant performance changes in reaction to race salience, multiracial individuals did not. Study 4 finds that emphasizing the social construction of race buffers individuals from stereotype threat effects.