Hypothesis testing for coefficient alpha: An SEM approach

We show how to test hypotheses for coefficient alpha in three different situations: (1) hypothesis tests of whether coefficient alpha equals a prespecified value, (2) hypothesis tests involving two statistically independent sample alphas as may arise when testing the equality of coefficient alpha across groups, and (3) hypothesis tests involving two statistically dependent sample alphas as may arise when testing the equality of alpha across time or when testing the equality of alpha for two test scores within the same sample. We illustrate how these hypotheses may be tested in a structural equation-modeling framework under the assumption of normally distributed responses and also under asymptotically distribution free assumptions. The formulas for the hypothesis tests and computer code are given for four different applied examples. Supplemental materials for this article may be downloaded from http://brm.psychonomic-journals.org/content/supplemental.     

Effects of Bilingual Tact Instruction for a Child with Communication Disorder

We evaluated the effects of tact training when instruction was presented in English only compared to tact training in a bilingual format (in English and the home language, Portuguese) for a participant diagnosed with a communication disorder. The participant’s parents completed a questionnaire describing his exposure to both languages prior to the start of the study. We also conducted formal language assessments to determine the participant’s preexisting language abilities. An adapted alternating treatment design was used to compare the rate of acquisition in the two training conditions. Results show the participant emitted more correct responses during tact training in English than during the bilingual tact training. Generalization and maintenance of acquired tact responses for stimuli trained in the bilingual condition were greater than for stimuli trained in the English-only condition. These results are discussed with respect to implications for language-training programs for children with language delays and developmental disabilities, and we outline suggestions for future research in this area.     

High Trait Cheerfulness Individuals are More Sensitive to the Emotional Environment

The aim of this paper was to study whether trait cheerfulness modulates changes in state cheerfulness as a result of exposing participants to affective stimuli. Two studies with a within-participant experimental design were carried out. Forty-eight (33 women) and sixty-four (45 women) undergraduate psychology students were selected as Sample 1 and Sample 2, respectively, for scoring high or low on the Trait Form of the State-Trait-Cheerfulness Inventory (STCI-T; Ruch et al. in Humor Int J Humor Res 9:303–339, 1996; Ruch et al. in Personal Individ Differ 22:477–491, 1997). Participants watched amusing, neutral, and sad film clips and reported their affective states before and after viewing them. In the second study, heart rate and skin conductance level were also recorded. Results showed that people with high trait cheerfulness reported greater changes in state cheerfulness when exposed to both amusing and sad film clips, showing larger increases and decreases in state cheerfulness, respectively, than participants with low trait cheerfulness. Effects were not mediated by social desirability. Furthermore, people with low trait cheerfulness showed a greater heart rate deceleration during the visioning of the clips compared to high trait cheerfulness participants, especially in an amusing scene with high emotional load. No modulation on trait cheerfulness was found for skin conductance level. Data with self-report and electrophysiological measures are discussed, highlighting that high trait cheerfulness people are more permeable to affective events, perhaps showing a better understanding and management of them.     

Procura-PALavras (P-PAL): A Web-based interface for a new European Portuguese lexical database

In this article, we present Procura-PALavras (P-PAL), a Web-based interface for a new European Portuguese (EP) lexical database. Based on a contemporary printed corpus of over 227 million words, P-PAL provides a broad range of word attributes and statistics, including several measures of word frequency (e.g., raw counts, per-million word frequency, logarithmic Zipf scale), morpho-syntactic information (e.g., parts of speech [PoSs], grammatical gender and number, dominant PoS, and frequency and relative frequency of the dominant PoS), as well as several lexical and sublexical orthographic (e.g., number of letters; consonant–vowel orthographic structure; density and frequency of orthographic neighbors; orthographic Levenshtein distance; orthographic uniqueness point; orthographic syllabification; and trigram, bigram, and letter type and token frequencies), and phonological measures (e.g., pronunciation, number of phonemes, stress, density and frequency of phonological neighbors, transposed and phonographic neighbors, syllabification, and biphone and phone type and token frequencies) for ~53,000 lemmatized and ~208,000 nonlemmatized EP word forms. To obtain these metrics, researchers can choose between two word queries in the application: (i) analyze words previously selected for specific attributes and/or lexical and sublexical characteristics, or (ii) generate word lists that meet word requirements defined by the user in the menu of analyses. For the measures it provides and the flexibility it allows, P-PAL will be a key resource to support research in all cognitive areas that use EP verbal stimuli. P-PAL is freely available at http://p-pal.di.uminho.pt/tools.     

There’s More Than Catastrophizing in Chronic Pain: Low Frustration Tolerance and Self-Downing Also Predict Mental Health in Chronic Pain Patients

Among the potential range of irrational beliefs that could be used as predictors of physical and mental health, catastrophizing is the process that has received most attention in chronic pain research. Other irrational processes such as demandingness, low frustration tolerance, and self-downing have rarely been studied. The goal of this study was to explore whether this wider range of beliefs is associated with health in chronic pain patients beyond catastrophizing. A total of 492 chronic pain patients completed a measure of irrational beliefs, a measure of physical and mental health, and a numerical rating scale designed to assess pain intensity and interference. Irrational processes were more strongly associated with mental than with physical health. Low frustration tolerance and self-downing were found to be significantly related to mental health even after controlling for the effect of catastrophizing. Processes other than catastrophizing appear to have potentially important relationships with the mental health of people with chronic pain. These results may offer new intervention targets for practitioners.     

When the brain simulates stopping: Neural activity recorded during real and imagined stop-signal tasks

It has been suggested that mental rehearsal activates brain areas similar to those activated by real performance. Although inhibition is a key function of human behavior, there are no previous reports of brain activity during imagined response cancellation. We analyzed event-related potentials (ERPs) and time–frequency data associated with motor execution and inhibition during real and imagined performance of a stop-signal task. The ERPs characteristic of stop trials—that is, the stop-N2 and stop-P3—were also observed during covert performance of the task. Imagined stop (IS) trials yielded smaller stop-N2 amplitudes than did successful stop (SS) and unsuccessful stop (US) trials, but midfrontal theta power similar to that in SS trials. The stop-P3 amplitude for IS was intermediate between those observed for SS and US. The results may be explained by the absence of error-processing and correction processes during imagined performance. For go trials, real execution was associated with higher mu and beta desynchronization over motor areas, which confirms previous reports of lower motor activation during imagined execution and also with larger P3b amplitudes, probably indicating increased top-down attention to the real task. The similar patterns of activity observed for imagined and real performance suggest that imagination tasks may be useful for training inhibitory processes. Nevertheless, brain activation was generally weaker during mental rehearsal, probably as a result of the reduced engagement of top-down mechanisms and limited error processing.     

Further exploration of Filipino personality structure using the lexical approach: do the big-five or big-seven dimensions emerge?

Filipino college students (N=740) rated their personalities using 502 reasonably familiar terms from a comprehensive taxonomy of Filipino trait adjectives. Using factor analysis, we replicated the seven Filipino personality dimensions identified in a previous study (Church, Reyes, Katigbak and Grimm, 1997). At least seven factors are needed to identify dimensions resembling all of the Big Five. When positive- and negative-evaluation terms are included a Negative-Valence dimension is found, but positive-evaluation terms blend with Intellect terms rather than identifying a distinct dimension. Thus, the cross-cultural generalizability of the Big-Seven model (Tellegen and Waller, 1997) is not completely supported. Correlational analyses consistently show good one-to-one correspondence between the Filipino Gregariousness, Concern for Others versus Egotism, Conscientiousness, and Intellect dimensions and Big-Five Extraversion, Agreeableness, Conscientiousness, and Intellect, respectively. The Filipino Temperamentalness and Self-assurance dimensions, although moderately correlated with Neuroticism, are multidimensional in terms of the Big Five. © 1998 John Wiley & Sons, Ltd.     

From Interpretation to Commentary: Truth and Meaning in Psychotherapy

Some of the epistemological consequences of adopting the narrative point of view in psychotherapy are explored. Attempts to apply principles and norms from the philosophy of science to psychotherapy are criticized, since psychotherapy is not a science, but a technique. In addition, those models, related to the acquisition of knowledge, that consider that knowledge could increase by apposition without transforming the subject who is knowing are discussed. Natural science and hermeneutic metaphors are not suitable for understanding the practice of psychotherapy. Traditionally, the interpretation of symptoms or problems to solve has been the main instrument in therapy. In other words, the therapist tries to look for the truth hidden under the symptom, which then becomes a sign. Our proposition is to substitute these metaphors for the paradigm of text commentary. Text commentary, instead of providing a unique truth, provides a set of meanings suggested by a commentary. Characteristics that allow one to distinguish a good and a bad commentary, and implications of the paradigm described for the training of psychotherapists, are discussed.     

A genetic analysis of stereotypy in the mouse: dopaminergic plasticity following chronic stress

After repeated stressful experiences, DBA/2 (DBA) mice showed an increase in apomorphine-induced climbing while C57BL/6 (C57) mice showed a clear-cut decrease of this behavior. Genetic analysis involving F1 and F2 hybrids and the backcross populations (F1 X C57; F1 X DBA) indicated complete dominance of the C57 genotype and a significant genotype X environment interaction. These findings are discussed in terms of dopaminergic plasticity and of the heuristic value of this animal model in relation to disturbed behaviors triggered by stressful experiences.