Working Memory Capacity and the Development of Quantitative Central Conceptual Structures

Abstract

This article reconsiders Case’s theory of central conceptual structures (CCS), examining the relation between working memory and the acquisition of quantitative CCS. The lead hypothesis is that the development of working memory capacity shapes the development of quantitative concepts (whole and rational numbers). Study I, with 779 children from preschool to grade 5, validated a measure of the whole number CCS and found that children’s understanding of whole number advances by one developmental level per additional unit of working memory capacity. Study II, with 92 sixth- and seventh-graders, found that a test of the rational number CCS was predicted by working memory capacity and, to a lesser extent, by intrusion errors in the listening span. We also identified 2 subsets of items that demand a capacity of 4 or 5 units, respectively. Overall, the results support Case’s CCS theory and clarify the role of working memory in the acquisition of numerical concepts. The relevance of these results in relation to the current debate is discussed, with extensive connections to other current theories of whole or rational number comprehension.     

The temporal dynamics of first versus second language production

In this study we explored the temporal origin of processing differences between first and second language production. Forty highly proficient bilinguals named objects of high and low lexical frequency aloud for both L1 and L2 separately while event-related brain potentials (ERPs) were recorded. The first electrophysiological differences elicited by response language occurred at the same early P2 peak (∼140–220 ms) where we observed the onset of the lexical frequency effect, but only for those bilinguals who started naming in an L1 context and afterwards switched to an L2 naming context. The bilinguals who named objects in the reverse direction did not display a language effect in the ERPs. Taken together, the data show that the L2 naming disadvantage originates during the onset of lexical access and seems to be driven by both representational strength, which is lower for L2 words, and language control demands, which are higher for L2 words.     

The Impact of Rumination on State Paranoid Ideation in a Nonclinical Sample

Cognitive-behavioral models of paranoia have emphasized the potential role of perseverative thinking styles, such as rumination or worry, in the development, maintenance and exacerbation of paranoid beliefs. This study aimed to experimentally test the hypothesis that rumination may play a role in the maintenance or exacerbation of state paranoid ideation. Following a paranoia induction, 37 nonclinical participants were randomly assigned to either a rumination task or a distraction control condition. In accord with main hypothesis, rumination was associated with maintained levels of paranoia, whereas distraction was associated with a decrease in levels of paranoia. These findings suggest that perseverative thinking may play a role in the maintenance of paranoid ideas, which may have implications for our understanding of the maintenance of paranoia and persecutory delusions in the clinical population. Furthermore, the study used a novel experimental paradigm for inducing paranoia, which may prove valuable for future research aiming to elicit paranoid thoughts and feelings in vivo.     

The role of outcome inhibition in interference between outcomes: A contingency‐learning analogue of retrieval‐induced forgetting

Current associative theories of contingency learning assume that inhibitory learning plays a part in the interference between outcomes. However, it is unclear whether this inhibitory learning results in the inhibition of the outcome representation or whether it simply counteracts previous excitatory learning so that the outcome representation is neither activated nor inhibited. Additionally, these models tend to conceptualize inhibition as a relatively transient and cue‐dependent state. However, research on retrieval‐induced forgetting suggests that the inhibition of representations is a real process that can be relatively independent of the retrieval cue used to access the inhibited information. Consistent with this alternative view, we found that interference between outcomes reduces the retrievability of the target outcome even when the outcome is associated with a novel (non‐inhibitory) cue. This result has important theoretical implications for associative models of interference and shows that the empirical facts and theories developed in studies of retrieval‐induced forgetting might be relevant in contingency learning and vice versa.     

Relational and Social Aggression and Reflective Processing in a University Sample

This study examined whether the dimension of reflective processing (e.g., deep and elaborative processing) was connected to the use of relational aggressions, social aggression, or both. A convenience sample of 629 college students (66% female, 91.6% White) was surveyed to ascertain the relation between self-reported relational and social aggression and deep and elaborative processing. The overall multivariate regression model was significant, Wilks’s λ = .12, F(4, 2162) = 1010.80, p < .001. Univariate results were used to show that the two predictors (relational and social aggression) significantly and strongly positively predicted the use of deep processing, R² = .81, p < .001, as well as the use of elaborative processing, R² = .87, p < .001. In summary, higher levels of social and relational aggression were related to higher levels of deep and elaborative processing. Implications for these findings are presented.     

Short- and Long-Term Implicit Memory in Aging and Alzheimer's Disease

ABSTRACT

Implicit memory processes were investigated via picture naming in healthy young and older adults and in persons with mild Alzheimer's disease (AD). Repetition priming in picture-naming was intact in all groups over the course of a short retention interval (seconds), and only the AD group revealed a deficit over a longer interval (72 hours). In addition, the AD group showed impaired procedural memory, with no benefit of practice on picture-naming. Impaired long-term priming was related to severity of AD. Both theoretical and methodological implications are discussed.     

Stereotypic ingroup bias as self‐defense against relative deprivation: evidence from a longitudinal study of the German unification process

In a longitudinal questionnaire field study on psychological consequences of German unification, the intergroup situation between East and West Germans was investigated. Data were collected in 1996 and 1998. The sample consisted of 585 East Germans and 387 West Germans who had never lived in the other part of Germany. It was assumed that East Germans' social identity is threatened due to their fraternal deprivation in comparison with West Germans. It was predicted that East Germans would employ ingroup bias as an identity management strategy in order to protect their emotional well‐being against harmful consequences of fraternal deprivation. In line with this prediction, it was found that (a) East Germans feel fraternally deprived compared to West Germans on important quality of life dimensions, (b) they display ingroup bias vis‐à‐vis West Germans, (c) ingroup bias increases with increasing East German identity, (d) ingroup bias is determined longitudinally by relative deprivation, and (e) ingroup bias buffers the effect of relative deprivation on mental health over time. As expected, ingroup bias and the effects of ingroup bias were larger for the dimension of personal integrity than for the dimensions of sympathy and competence. Ingroup bias is interpreted as compensatory self‐enhancement. West Germans feel fraternally privileged compared to East Germans and consider their advantages to be undeserved. Unexpectedly, West Germans display outgroup bias on the stereotype dimensions of integrity. This bias is interpreted as an effort to appease the moral outrage of East Germans and to silence their own guilty conscience due to undeserved advantages. Copyright © 2002 John Wiley & Sons, Ltd.     

EVIDENCE THAT GENDER DIFFERENCES IN SOCIAL DOMINANCE ORIENTATION RESULT FROM GENDERED SELF-STEREOTYPING AND GROUP-INTERESTED RESPONSES TO PATRIARCHY

Numerous studies have found that, compared to women, men express higher levels of social dominance orientation (SDO), an individual difference variable reflecting support for unequal, hierarchical relationships between groups. Recent research suggests that the often-observed gender difference in SDO results from processes related to gender group identity. We hypothesized that two aspects of gender group identity could account for men's higher SDO relative to women's: responses to patriarchy that reflect the interests of the gender ingroup (as measured by hostile and benevolent sexism) and self-stereotyping in gendered terms. We found the gender difference in SDO was fully mediated by gender differences in feminine self-stereotyping, hostile sexism, and benevolent sexism. The discussion addresses implications for social dominance theory's treatment of gender and the complexity of social-contextual forces that produce gender differences in SDO.     

Stimulus control in the experimental study of cooperation

The cooperative responses of pairs of human subjects were reinforced under several stimulus conditions in two settings designed to require a "social" response, i.e., where at least one of the two persons is responding to the behavior of the other. The first task, designed by Lindsley and Cohen, required individual responses within 0.5 sec of one another for reinforcement. The second (modified) task required a delay of 3 sec between individual responses. To determine dependence of cooperation on social stimuli, rates of cooperative behavior on these tasks were compared in the presence and absence of a stimulus indicating to each subject the other's response and a stimulus which indicated the duration of the timeout after reinforcement. The results indicated that only in the modified task was a high rate of cooperation always contingent upon the presence of the social stimuli.