Unidimensionality of Abbreviated Proactive Personality Scales across Cultures

Vu la pertinence de la personnalité proactive et du comportement proactif pour l’efficacité des individus, des équipes et des organisations dans un environnement de plus en plus multiculturel, cette étude a examiné l’unidimensionnalité des formes abrégées de l’Echelle de Personnalité Proactive (PPS) de Bateman & Crant (1993) sur des données ni américaines, ni britanniques. L’unidimensionnalité des PPS à 10, 6, 5 et 4 items a été mise à l’épreuve grâce à une analyse factorielle et à une analyse de fidélité interne sur des échantillons indépendants provenant de trois pays: la Belgique (N= 822), la Finlande (N= 100) et l’Espagne (N= 100). Les résultats montrent que les versions de 4 et 5 items ne présentent aucune fidélité interne en Belgique, en Finlande et en Espagne, tandis que les deux autres formes abrégées sont satisfaisantes. L’analyse factorielle confirme qu’un modèle à facteur unique est une solution quasi optimale pour la PPS à 10 items. La PPS à 6 items mesure la personnalité proactive avec une fidélité interne cohérente à partir d’un facteur unique. Le score total sur l’échelle a été calculé par l’addition des scores sur les 6 items. On a obtenu sur un autre échantillon belge (N= 499) une corrélation des plus satisfaisantes (r= .92) entre la PPS de 6 items et la version originelle de 17 items. Given the relevance of proactive personality and proactive behavior for effectiveness of individuals, teams, and organisations in an increasingly multicultural context, this study investigated the unidimensionality of abbreviated forms of the Proactive Personality Scale (PPS; Bateman & Crant, 1993 ) beyond American and British data. The unidimensionality of the 10‐item, the 6‐item, the 5‐item, and the 4‐item PPS was tested through internal reliability analysis and factor analysis across independent samples in three countries (Belgium, N= 822; Finland, N= 100; Spain, N= 100). The results showed that the 5‐item and the 4‐item versions were not internally reliable in Belgium, Finland, and Spain, while the two other abbreviated forms of the PPS were. Factor analysis showed that a one‐factor solution for the 10‐item PPS was a sub‐optimal solution. The 6‐item PPS, however, measured the proactive personality in an internally consistent manner and through a single factor. The total score on the scale was calculated by adding up scores on the six items. In a separate Belgian sample (N= 499), correlations of the 6‐item PPS with the original 17‐item PPS proved satisfactory with r= .92.     

Interaction between the basolateral amygdala and dorsal hippocampus is critical for cocaine memory reconsolidation and subsequent drug context-induced cocaine-seeking behavior in rats

Contextual stimulus control over instrumental drug-seeking behavior relies on the reconsolidation of context-response-drug associative memories into long-term memory storage following retrieval-induced destabilization. According to previous studies, the basolateral amygdala (BLA) and dorsal hippocampus (DH) regulate cocaine-related memory reconsolidation; however, it is not known whether these brain regions interact or independently control this phenomenon. To investigate this question, rats were trained to lever press for cocaine reinforcement in a distinct environmental context followed by extinction training in a different context. Rats were then briefly re-exposed to the cocaine-paired context to destabilize cocaine-related memories, or they were exposed to an unpaired context. Immediately thereafter, the rats received unilateral microinfusions of anisomycin (ANI) into the BLA plus baclofen/muscimol (B/M) into the contralateral (BLA/DH disconnection) or ipsilateral DH, or they received contralateral or ipsilateral microinfusions of vehicle. They then remained in their home cages overnight or for 21 d, followed by additional extinction training and a test of cocaine-seeking behavior (nonreinforced active lever responding). BLA/DH disconnection following re-exposure to the cocaine-paired context, but not the unpaired context, impaired subsequent drug context-induced cocaine-seeking behavior relative to vehicle or ipsilateral ANI + B/M treatment. Prolonged home cage stay elicited a time-dependent increase, or incubation, of drug-context-induced cocaine-seeking behavior, and BLA/DH disconnection inhibited this incubation effect despite some recovery of cocaine-seeking behavior. Thus, the BLA and DH interact to regulate the reconsolidation of cocaine-related associative memories, thereby facilitating the ability of drug-paired contexts to trigger cocaine-seeking behavior and contributing to the incubation of cocaine-seeking behavior.     

Recording vocalizations with Bluetooth technology

We propose a method for capturing vocalizations that is designed to avoid some of the limiting factors found in traditional bioacoustical methods, such as the impossibility of obtaining continuous long-term registers or analyzing amplitude due to the continuous change of distance between the subject and the position of the recording system. Using Bluetooth technology, vocalizations are captured and transmitted wirelessly into a receiving system without affecting the quality of the signal. The recordings of the proposed system were compared to those obtained as a reference, which were based on the coding of the signal with the so-called pulse-code modulation technique in WAV audio format without any compressing process. The evaluation showed p < .05 for the measured quantitative and qualitative parameters. We also describe how the transmitting system is encapsulated and fixed on the animal and a way to video record a spider monkey’s behavior simultaneously with the audio recordings.     

Race Dialogues in Group Psychotherapy: Key Issues in Training and Practice

Growing racial and ethnic diversity in the United States and globally requires culturally competent mental health professionals who can address ongoing racial tensions and experiences of racism and xenophobia. Attending to racial and ethnic issues and infusing race and ethnic dialogues in group psychotherapy can play a major role in addressing mental health problems, promoting racial harmony, and healing deep psychological wounds and trauma that are the result of racial tensions. This article describes seven key issues necessary to effectively address race and ethnicity in group psychotherapy.     

The auditory sensory memory trace decays rapidly in newborns

The present study investigated the temporal dynamics of auditory sensory memory in newborns as reflected by the mismatch negativity (MMN), a preattentive electric change-detection response. MMN was obtained from 24 full-term healthy newborns who were either awake or asleep (quiet or active sleep) during the experiments. Stimuli were 1,000 Hz tones (standards) that were occasionally replaced by 1,100 Hz tones (deviants). The constant stimulus onset asynchrony (SOA) was, in separate blocks, either 450, 800, or 1,500 ms. A prominent MMN was obtained at the 800 ms SOA in all three sleep or waking states, whereas no MMN occurred at 450 and 1,500 ms SOAs. In view of the fact that in adults MMN is elicited even with a 10s SOA, these results imply that the time span of auditory memory is considerably shorter in neonates than in adults and 8-12-year-old children.     

Role of dopamine,the frontal cortex and memory circuits in drug addiction: insight from imaging studies

Drug addiction is characterized by a set of recurring processes (intoxication, withdrawal, craving) that lead to the relapsing nature of the disorder. We have used positron emission tomography to investigate in humans the role of dopamine (DA) and the brain circuits it regulates in these processes. We have shown that increases in DA are associated with the subjective reports of drug reinforcement corroborating the relevance of drug-induced DA increases in the rewarding effects of drugs in humans. During withdrawal we have shown in drug abusers significant reductions in DA D2 receptors and in DA release. We postulate that this hypodopaminergic state would result in a decreased sensitivity to natural reinforcers perpetuating the use of the drug as a means to compensate for this deficit and contributing to the anhedonia and dysphoria seen during withdrawal. Because the D2 reductions are associated with decreased activity in the anterior cingulate gyrus and in the orbitofrontal cortex we postulate that this is one of the mechanisms by which DA disruption leads to compulsive drug administration and the lack of control over drug intake in the drug-addicted individual. This is supported by studies showing that during craving these frontal regions become hyperactive in proportion to the intensity of the craving. Craving is also associated with activation of memory circuits including the amygdala (implicated in conditioned learning), hippocampus (implicated in declarative learning), and dorsal striatum (implicated in habit learning) all of which receive DA innervation. We therefore postulate that dopamine contributes to addiction by disrupting the frontal cortical circuits that regulate motivation, drive, and self-control and by memory circuits that increase the motivational salience of the drug and drug-associated stimuli.     

Working memory retention systems: a state of activated long-term memory

High temporal resolution event-related brain potential and electroencephalographic coherence studies of the neural substrate of short-term storage in working memory indicate that the sustained coactivation of both prefrontal cortex and the posterior cortical systems that participate in the initial perception and comprehension of the retained information are involved in its storage. These studies further show that short-term storage mechanisms involve an increase in neural synchrony between prefrontal cortex and posterior cortex and the enhanced activation of long-term memory representations of material held in short-term memory. This activation begins during the encoding/comprehension phase and evidently is prolonged into the retention phase by attentional drive from prefrontal cortex control systems. A parsimonious interpretation of these findings is that the long-term memory systems associated with the posterior cortical processors provide the necessary representational basis for working memory, with the property of short-term memory decay being primarily due to the posterior system. In this view, there is no reason to posit specialized neural systems whose functions are limited to those of short-term storage buffers. Prefrontal cortex provides the attentional pointer system for maintaining activation in the appropriate posterior processing systems. Short-term memory capacity and phenomena such as displacement of information in short-term memory are determined by limitations on the number of pointers that can be sustained by the prefrontal control systems.     

Machiavellianism and Theory of Mind in people affected by schizophrenia

CONTEXT: People affected by schizophrenia show deficits in social interaction (Cramer, Bowen, & O'Neill, 1992); such a deficit may stem from an alteration in the representation of mental states. OBJECT: In this study we have examined 42 people affected by schizophrenia, diagnosed according to DSM-IV criteria, by testing them with an instrument (the Mach IV scale, Christie & Geis, 1970) assessing "Machiavellian Intelligence" according to Niccolò Machiavelli's assertions. Schizophrenic subjects were compared to a sample of normal controls, matched for age, sex, and education. OBJECTIVE: The aim of our study was to evaluate if there were correlations between the ability to understand other people's mental states and the capacity for interpreting "Machiavellian expressions." RESULTS: Results show that people affected by schizophrenia are less able to use Machiavellian-style "tactical" abilities than controls. CONCLUSION: Such a disability seems to be correlated to poor mentalising abilities.