The effects of stimulus sequence on event related potentials: A comparison of visual and auditory sequences

The effect of stimulus sequence on the waveform of the scalp-recorded event-related potential (ERP) was studied in the auditory and visual modalities. The results indicate that the sequential effects are qualitatively similar in the two modalities; however, an interaction appeared between the modalities and the stimulus effects. The degree of sequential effect was a function of whether or not the stimulus eliciting the ERP was the counted (target) event. This finding is discussed in terms of an expectancy model, and the interaction is attributed to variations in short-term memory for past events as a function of the level of processing required for each.     

The child's conceptions about means of production and their owners

Investigated the child's social ideas, namely notions about production means (factory, public transportation, farmland) and family influence on notion acquisition. 120 children of jive age groups (4 to 13 years) were clinically interviewed (sensu Piaget). Children's parents, workers and housewives of an Italian industrial centre, answered to questionnaires inquiring background information on parents and child and appraisal of child's level of understanding. Interview answers were classified on ten level sequences concerning father's job, home ownership, function and ownership of production means and produce. Correlational analyses and separate ANOVAs [5(age) × 2(sex) × 3(production mean)] in three subject areas (owner of production mean, of produce, and produce use) of interview answers reveal that children's ideas about different production means develop with differing rhythms through the same level sequences, which are clearly related to the general characterstics of intelligence described by Piaget. Questionnaires show that parents tend to furnish their children with the degree of information concerning jobs appropriate to the level of development at which the parents believe their children to be.     

AF-DX 116, a Presynaptic Muscarinic Receptor Antagonist, Potentiates the Effects of Glucose and Reverses the Effects of Insulin on Memory

Male Swiss mice were tested 24 h after training in a one-trial step-through inhibitory avoidance task. Low subeffective doses of -(+)-glucose (10 mg/kg, ip), but not its stereoisomer -(−)-glucose (30 mg/kg, ip), administered immediately after training, and AF-DX 116 (0.3 mg/kg, ip), a presynaptic muscarinic receptor antagonist, given 10 min after training, interact to improve retention. Insulin (8 IU/kg, ip) impaired retention when injected immediately after training, and the effects were reversed, in a dose-related manner, by AF-DX 116 (0.3, 1.0, or 3.0 mg/kg, ip) administered 10 min following insulin. Since AF-DX 116 possibly blocks autoreceptors mediating the inhibition of acetylcholine release from cholinergic nerve terminals, the present data support the view that changes in the central nervous system glucose availability, subsequent to modification of circulating glucose levels, influence the activity of central cholinergic mechanisms involved in memory storage of an inhibitory avoidance response in mice.     

Stereotypes and beliefs about different ethnic groups in Spain. A study with Spanish and Latin American children living in Madrid

96 Spanish and Latin American children from 3 grades in Madrid reported their knowledge of positive and negative stereotypes regarding Spaniards, Gypsies, Latin American and Chinese people. Their personal beliefs about these four ethnic groups were also assessed. Stereotypes about Spaniards were perceived as overwhelmingly positive and least negatively while stereotypes about Gypsies were rarely positive and often negative. Spanish children attributed more positive and fewer negative stereotypes to Chinese immigrants than Latin American children did. Older children reported more positive stereotypes about Gypsies than younger children and older Spanish children reported fewer positive stereotypes for their own group than their younger counterparts. Older children's personal beliefs about Gypsies were less consistent with negative stereotypes than younger children's. Older children also showed greater discrepancy of their personal beliefs with positive stereotypes of Spaniards than younger children did. Findings are discussed within the context of socio-cognitive approaches.     

Taking the easy way out: preference diversity, decision strategies, and decision refusal in groups

It has often been argued and found that preference diversity is beneficial for the quality of group decisions. However, this literature has neglected the fact that in many situations, it is also possible not to choose. Further, preference diversity can be based on attractions, aversions, or both. The authors argue that some types of preference diversity can lead to biased discussions and choice refusal (i.e., the group refuses to choose any of the available options). In a laboratory experiment, three different patterns were observed. When group members held different aversions before discussion, discussions were aversion driven and group members quickly agreed to refuse all alternatives. When each alternative had both a proponent and an adversary, discussions were longer and unbiased but still often led to refusal, which was accompanied by relatively low levels of outcome satisfaction. Only when preference diversity was based only on attractions did it lead to unbiased discussion, low prevalence of refusal, and high outcome satisfaction. Implications for group decision making are discussed.     

Decomposition of repetition priming components in picture naming

Cognitive mechanisms underlying repetition priming in picture naming were decomposed in several experiments. Sets of encoding manipulations meant to selectively prime or reduce priming in object identification or word production components of picture naming were combined factorially to dissociate processes underlying priming in picture naming. Experiments 1, 2, and 3 were conducted with Spanish-English bilingual participants and bilingual materials. Experiments 4, 5A, and 5B were single-language experiments in English or Spanish. A simple process model was used to formalize the theoretical predictions and test them across all experiments simultaneously. Object identification and word production processes were selectively influenced in an additive manner, which suggests that the 2 sets of processes are independent and sequential. The patterns of facilitation support a quantitative model of transfer-appropriate processing in which shared processes from encoding to test are the causal basis and speeded processes are the mechanism of facilitation.     

Recognition memory and prefrontal cortex: dissociating recollection and familiarity processes using rTMS

Recognition memory can be supported by both the assessment of the familiarity of an item and by the recollection of the context in which an item was encountered. The neural substrates of these memory processes are controversial. To address these issues we applied repetitive transcranial magnetic stimulation (rTMS) over the right and left dorsolateral prefrontal cortex (DLPFC) of healthy subjects performing a remember/know task. rTMS disrupted familiarity judgments when applied before encoding of stimuli over both right and left DLPFC. rTMS disrupted recollection when applied before encoding of stimuli over the right DLPFC. These findings suggest that the DLPFC plays a critical role in recognition memory based on familiarity as well as recollection.     

Latent variable models for multivariate longitudinal ordinal responses

The paper proposes a full information maximum likelihood estimation method for modelling multivariate longitudinal ordinal variables. Two latent variable models are proposed that account for dependencies among items within time and between time. One model fits item‐specific random effects which account for the between time points correlations and the second model uses a common factor. The relationships between the time‐dependent latent variables are modelled with a non‐stationary autoregressive model. The proposed models are fitted to a real data set.     

Predictive Factors of Ethnic Prejudice Toward Immigrants in a Representative Subsample of Spanish Young People1

This research aimed to study those factors that predict different types of ethnic prejudice in a representative subsample of Spanish young people. The instrument we used was Pettigrew & Meertens' (1995 ) blatant/subtle prejudice scale. Results show that although there is a similar underlying pattern in both types of ethnic prejudice, subtle prejudice is based more on cultural differences, whereas blatant prejudice also stresses the racial, economic, and labor effects of immigration. Moreover, blatant prejudice is also influenced by the formal level of education and political position. The results are interpreted within the Spanish context; and the implications for identity formation and maintenance, and practical programs directed toward ethnic prejudice awareness are discussed.