Spatial interference and response control in sequence learning: the role of explicit knowledge

In several sequence learning studies it has been suggested that response control shifts from the stimuli to some internal representation (i.e., motor program) through the learning process. The main questions addressed in this paper are whether this control shift is related to explicit knowledge and whether the formation of these internal representations depends on the stimulus attributes. In one experiment we compared the learning of a response sequence triggered by either spatial location or location symbol (left-right) by using a serial response task (SRT). Symbols were presented at either a centered or random location. The results showed that in the symbolic conditions the shift of response control correlated with the emergence of explicit knowledge. Only participants with complete explicit knowledge seemed to learn the sequence structure beyond probabilistic information (response time "RT" did not depend on the frequency of the response). Moreover, these participants were able to overcome, when needed, spatial interference (RT was the same for both spatially corresponding and non-corresponding trials). However, when spatial location was relevant, RT was always faster, especially for more frequent responses. These results suggest that the relevant stimulus dimension (location or symbol) seems to engage different sequence learning mechanisms.     

Moderators of the Relation Between Popularity and Depressive Symptoms in Children: Processing Strength and Friendship Value

Children with low (n = 25) and high (n = 38) peer-rated popularity completed an emotional Stroop task, using negative social words, a self-report measure of friendship value relative to other domains of competence, and the Child Depression Inventory (CDI). Six months later, they completed the CDI again. In regression analyses, after controlling for prior CDI scores, social status interacted significantly with both Stroop and value measures (separate regressions). For unpopular children, both greater friendship valuing and greater negative social word Stroop interference predicted increases in depressive symptoms. In contrast, neither predictor was significant for popular children. In a third regression that included friendship value and Stroop interference as joint predictors of depression change, their effects remained significant and independent. We discuss these findings' implications for 3 models of depression; Champion and Power's social-cognitive theory of depression (L. A. Champion and M. J. Power, 1995), Pyszczynski and Greenberg's self-regulatory perseveration theory of depression (T. Pyszczynski & J. Greenberg, 1992), and Harter's model of global self-worth (S. Harter, 1985).     

Teacher Burnout and Lack of Reciprocity1

Results are presented of a study on burnout among 249 Dutch elementary and secondary school teachers. The current study considers burnout in terms of the exchange of investments and outcomes at interpersonal (teacher-student) and organizational (teacher-school) levels. In addition, demographic (age and gender) and work-related factors (school type, teaching experience, number of hours employed) are included. Findings show that when teachers invest more than they get back from their school, they report higher levels of emotional exhaustion. As expected, at the interpersonal level, low outcomes from students are related to higher burnout levels; whereas at the organizational level, low investments are related to higher burnout levels. These findings are discussed in terms of the extent to which psychological contact is more intimate or impersonal in both types of relationships.     

Ambivalence Over Emotional Expression and Psychological Weil-Being Among Rheumatoid Arthritis Patients and Their Spouses1

Associations between ambivalence over emotional expression and psychological well-being among rheumatoid arthritis patients and their spouses were investigated. Sixty-nine couples completed questionnaires assessing ambivalence over emotional expression, emotional expressiveness, psychological well-being, and strategies used in coping with arthritis. Associations between the patient's ambivalence and psychological well-being were stronger for those married to a highly ambivalent spouse, although this pattern of results was not found for spouses. Lower psychological well-being among more ambivalent spouses, and to a lesser extent patients, could be partially explained by their greater use of passive and distancing coping strategies. Results emphasize the importance of taking a dyadic approach to the study of psychological functioning among chronically ill patients and their spouses.     

Quasivarieties Generated by Simple MV-algebras

In this paper we show that the quasivariety generated by an infinite simple MV-algebra only depends on the rationals which it contains. We extend this property to arbitrary families of simple MV-algebras.     

Life Circumstances and Personal Resources as Predictors of the Ten-Year Course of Depression

A 10-year naturalistic study of 313 patients who entered treatment for unipolar depression and a community comparison group of 284 nondepressed adults was conducted. We compared life stressors, social resources, personal resources, and coping among patients who were remitted (N = 76), partially remitted (N = 146), or nonremitted (N = 91). Compared with the controls and the remitted patients, the partially remitted and nonremitted patients consistently experienced more life stressors and fewer social resources, were less easygoing, and relied more on avoidance coping. A less easygoing disposition, fewer close relationships, and more reliance on avoidance coping were associated with higher odds of experiencing a course of partial remission or nonremission. In addition, more depressive symptoms and medical conditions predicted nonremission.     

Methylphenidate Does Not Modify the Impact of Response Frequency or Stimulus Sequence on Performance and Event-Related Potentials of Children with Attention Deficit Hyperactivity Disorder

Twenty-six children with attention deficit/hyperactivity disorder (ADHD) participated in a double-blind trial consisting of 2 consecutive weeks each of placebo and methylphenidate (M = 26.92 mg/day = 0.78 mg/kg/day). As expected, stimulant therapy resulted in moderate weight loss, increased somatic complaints, and teacher and parent reports of reduced inattentiveness, aggression, and oppositionality. In both phases of the trial, patients were tested in a choice reaction time task assessing two aspects of the task that presumably affect response selection: response frequency (ratio of targets/nontargets = 25/75 vs. 50/50) and stimulus sequence (alternations vs. repetitions). Both manipulations yielded expected results on performance and event-related potentials (ERPs). Stimulant treatment increased accuracy and speed among younger children and curtailed variability of reaction time for the sample as a whole. However, methylphenidate did not affect ERPs. In combination, the results imply that the enhancement of performance by methylphenidate does not involve the demands of response selection examined in this study.     

Predictors of Psychosocial and Cognitive Adaptation in Children with Sickle Cell Syndromes

Examined the role of socioecological factors (family functioning and socioeconomic variables) in predicting behavioral and cognitive adaptation in children with sickle cell syndromes (SCD). Participants included 74 African American children and adolescents with SCD and their primary caretakers. Outcomes included internalizing and externalizing behavior symptoms, as rated by caretakers, as well as intellectual abilities and academic achievement, as assessed by individually administered standardized instruments. Family functioning consisted of both caretaker adjustment and family environment (i.e., family adaptability and cohesion). Hierarchical multiple regression analyses revealed that caretaker psychological adjustment predicted externalizing behaviors, while family environment (i.e., adaptability and cohesion) predicted neither behavioral nor cognitive functioning. Socioeconomic variables alone predicted intellectual abilities and academic achievement and also contributed to the prediction of child behavioral adaptation. Results are discussed in terms of relevant sociocultural issues and implications for family-level prevention and intervention.     

Family-expressed emotion,childhood-onset depression,and childhood-onset schizophrenia spectrum disorders: Is expressed emotion a nonspecific correlate of child psychopathology or a specific risk factor for depression?

Expressed emotion (EE) was examined, using the brief Five Minute Speech Sample measure, in families of (1) children with depressive disorders, (2) children with schizophrenia spectrum disorders, and (3) normal controls screened for the absence of psychiatric disorder. Consistent with the hypothesis of some specificity in the association between EE and the form of child disorder, rates of EE were significantly higher among families of depressed children compared to families of normal controls and families of children with schizophrenia spectrum disorders. Within the depressed group, the presence of a comorbid disruptive behavior disorder was associated with high levels of critical EE, underscoring the need to attend to comorbid patterns and subtypes of EE in future research.This research was supported by a grant from the John D. and Catherine T. MacArthur Foundation as part of their Network on Risk and Protective Factors in the Major Mental Disorders. The authors wish to express their appreciation to Sybil Zaden and Ana Magana-Amato for their assistance coding the FMSS-EE data, to Gwen Gordon for her assistance with data analysis, and to the families participating in the project.