Task switching: the effect of task recency with dual- and single-affordance stimuli

When we switch to a new task, performance is transiently relatively poor, but improves dramatically after one trial. Such a “switch cost” may result from the preceding task being highly primed while the new task is not yet primed. This predicts that it should become more difficult to switch back to Task A when more trials of Task B have intervened. Such a lag effect has been found in some but not in most previous experiments, and to resolve this discrepancy we examined the effects of task lag with different stimuli. We found that when stimuli uniquely and clearly cued the task—minimizing the need for control—switch reaction time increased with task lag. However, when the need for control was increased by using similar or identical stimuli in the two tasks, this lag effect was abolished or reversed. Thus only when control processes are minimized can priming explain the difficulty of switching back from Task B to Task A. Second, we asked how the impact of control is mediated in conditions where it is not minimized. If it is mediated through altering the relative activation states of competing tasks, then as it becomes easier to do one task—the relative task-set activation state is tipped in that task's favour—it should always become harder to do the other task. On the other hand, if control bias affects switch performance directly, this relationship need not hold. We found that as it becomes easier to perform one task it can become easier, not harder, to switch to the competing task. Thus control bias must act directly on switch performance, rather than only through its influence on relative task-set activation.     

Involvement of IP3 receptors in LTP and LTD induction in guinea pig hippocampal CA1 neurons

The role of inositol 1, 4, 5-trisphosphate receptors (IP3Rs) in long-term potentiation (LTP) and long-term depression (LTD) was studied in CA1 neurons in guinea pig hippocampal slices. In standard solution, short tetanic stimulation consisting of 15 pulses at 100 Hz induced LTP, while three short trains of low-frequency stimulation (LFS; 200 pulses at 1 Hz) at 18-min intervals or one long train of LFS (1000 pulses at 1 Hz) induced stable LTD in both the slope of the field EPSP (S-EPSP) and the amplitude of the population spike (A-PS). Bath application of 2-aminoethoxydiphenyl borate (2-APB), an IP3R antagonist, or of alpha-methyl-4-carboxyphenylglycine (MCPG), a wide-spectrum metabotropic glutamate receptor antagonist, during weak tetanic stimulation significantly increased the magnitude of the LTP in both the S-EPSP and A-PS. Three short trains of LFS or one long train of LFS delivered in the presence of 2-APB or MCPG did not induce LTD, but elicited LTP. Based on these results, we conclude that, in hippocampal CA1 neurons, IP3Rs play an important role in synaptic plasticity by attenuating LTP and facilitating LTD.     

Computer-Facilitated Therapy: Reality-Based Dialogue with People with Schizophrenia

Schizophrenia is often characterized by deficits in information processing, attention, and memory that profoundly disrupt communication. Two vignettes are presented to illustrate how computer word-processing technique can be used with people with schizophrenia to facilitate reality-based conversation, to help them remember or remain focused in therapy session, and to participate with them in the development of cognitive-behavioral statements in managing their psychiatric symptoms. By visually representing the spoken words on the computer screen, the author hypothesizes that people with schizophrenia can partially compensate for the difficulties in remaining focused in a typically auditory-based conversational mode. Print-outs given from the conversational sessions can also be helpful as a memory aid.     

Hunger and Social Motivation: Hungry People are Less Interested in Social Activities than Satiated People

College students (N = 207) were asked their level of interest in sex, dating, and friendship affiliation before or after eating dinner at a dining hall. The threat of hunger before dinner was predicted to make participants focus on satisfying this need and therefore be less interested in social activities, compared to participants after dinner who were not hungry. Consistent with predictions, hungry males and females were less interested in sex, dating, and hanging out with friends compared to individuals who had just eaten. Results are considered in the context of motivation theory and recent research findings in the areas of physical attraction and social inclusion.     

Numbers for Boys and Words for Girls? Academic Gender Stereotypes among Chinese Parents

Academic gender stereotypes contribute to observed gender differences in educational enrollment and attainment. Investigating parents’ stereotypes among 907 families in China, this study used exploratory and confirmatory factor analyses to uncover four latent factors: boys-Math, boys-Sciences, girls-Chinese, and girls-Liberal Arts stereotypes. The former two depicted boys as more gifted, enthusiastic, and higher-achieving learners in Math and Sciences, and the latter two favored girls in Chinese and Liberal Arts. This four-factor structure was invariant across parents with sons and daughters after accounting for the nonindependence of parents within families. The boys-Math and boys-Sciences stereotypes were found to be stronger than the other two stereotypes. Further analyses revealed nuances concerning the boys-Math stereotype: it was more pronounced among mothers than fathers in families with daughters, fathers with sons than daughters, and girls’ mothers without college degrees than those with degrees. Within the same family, mothers more commonly held stereotype-consistent perceptions concerning Math and Chinese than fathers, but there was a general agreement over gendered perceptions of all four achievement domains regardless of child gender. The findings highlight the need for family-based awareness-raising programs targeting parents’ gender stereotypes to create gender-fair and gender-inclusive learning environments.

     

One Foot Out of the Nest: How Parents and Friends Influence Social Perceptions in Emerging Adulthood

Attachment theory proposes that representations of attachment figures are transferred between relationships, resulting in stable relational experiences. The current study used a transference paradigm to examine how parental and best friend attachment representations influence perceptions of new relationship partners in emerging adulthood. We discovered that close friendships influenced attachment anxiety and avoidance experienced specifically with friend-like others, while parental relationships affected feelings of anxiety toward a variety of people. Several relationship factors, such as the importance of the friend relationship, moderated the transference process. Our findings suggest that emerging adults’ current relationships have an impact on their reactions toward novel individuals, and emerging adults’ feelings about their existing relationship partners color their future social experiences.     

Religiosity and its association with positive and negative emotions among college students from Algeria

To explore the associations between religiosity and both positive and negative emotions and traits, a sample of 244 volunteer Muslim college students from Algeria was recruited. The students responded to five self-rating scales to assess religiosity, physical health, mental health, happiness, and satisfaction with life, in addition to the Arabic Scale of Optimism and Pessimism, and the Kuwait University Anxiety Scale. Religiosity and satisfaction with life were higher among women than men. Among men, religiosity was significantly correlated only with mental health. However, in women, religiosity was significantly and positively correlated with physical health, mental health, happiness, satisfaction with life, and optimism, whereas religiosity correlated negatively with both anxiety and pessimism. Factor analysis yielded a single bipolar factor labelled positive emotions and religiosity vs. neurotic tendency (anxiety and pessimism) in women. Two orthogonal factors were extracted in men: positive vs. negative traits of mental health, and religiosity. The present results are compatible with the wider literature on the association between religion and positive variables among a Muslim context.     

The creativity-spirituality construct and its role in transformative coping

The present study examines whether and to what extent creativity and spirituality are used in coping in a cross-cultural and cross-denominational student sample of 610 participants. Two new theory-based instruments, displaying good internal consistency and satisfactory levels of content-, and construct validity, are introduced, the Creative Coping Scale-19 (CCS-19), and the Spiritual Coping Scale-30 (SCS-30). A positive, moderate relationship between creative and spiritual coping emerged, thus supporting the theory of transformative coping. The findings demonstrated that participants applied both creative and spiritual coping in their lives in order to deal with acute and chronic stress. Associations between creative and spiritual coping and demographic variables were outlined. Practical applications for the promotion of mental health were discussed. Future research should seek to replicate and extend the present findings.     

A comparative study of Sr-doped LaMnO3 synthesised via solid-state reaction and sol–gel methods

ABSTRACT

This work deals with the synthesis of hole-doped La_1-xSr_xMnO₃ (x?=?0.25 and 0.33) perovskite via two different ways, namely a solid-state reaction method and a sol–gel process. Various properties of the samples have been investigated and compared by means of different techniques, namely X-ray diffraction (XRD), temperature-dependent resistivity measurements in the temperature range 25–300?K using a closed cycle refrigerator and vibrating sample magnetometry (VSM). All samples have orthorhombic crystal symmetry and an irregular variation in unit-cell volume with increase in Sr content. The average crystallite size was determined from the XRD data and found to lie in the range 19–22?nm. Metal–insulator transitions (MIT) were observed in all the samples via low-temperature electrical characterisations. The magnetic measurements confirm that the magnetisation does not saturate for the 25% Sr doped samples up to the available field of 10?kOe. The magnetic response also supports the interpretation of XRD and resistivity data. The obtained results are explained on the basis of double-exchange and super-exchange mechanisms.