Bayesian inference for psychology,part III: Parameter estimation in nonstandard models

We demonstrate the use of three popular Bayesian software packages that enable researchers to estimate parameters in a broad class of models that are commonly used in psychological research. We focus on WinBUGS, JAGS, and Stan, and show how they can be interfaced from R and MATLAB. We illustrate the use of the packages through two fully worked examples; the examples involve a simple univariate linear regression and fitting a multinomial processing tree model to data from a classic false-memory experiment. We conclude with a comparison of the strengths and weaknesses of the packages. Our example code, data, and this text are available via https://osf.io/ucmaz/.     

A Positive Psychology Intervention for Patients with an Acute Coronary Syndrome: Treatment Development and Proof-of-Concept Trial

Positive psychological constructs are associated with superior outcomes in cardiac patients, but there has been minimal study of positive psychology (PP) interventions in this population. Our objective was to describe the intervention development and pilot testing of an 8-week phone-based PP intervention for patients following an acute coronary syndrome (ACS). Initial intervention development and single-arm proof-of-concept trial, plus comparison of the PP intervention to a subsequently-recruited treatment as usual (TAU) cohort. PP development utilized existing literature, expert input, and qualitative interview data in ACS patients. In the proof-of-concept trial, the primary outcomes were feasibility and acceptability, measured by rates of exercise completion and participant ratings of exercise ease/utility. Secondary outcomes were pre-post changes in psychological outcomes and TAU comparisons, measured using effect sizes (Cohen’s d). The PP intervention and treatment manual were successfully created. In the proof-of-concept trial, 17/23 PP participants (74 %) completed at least 5 of 8 exercises. Participants rated the ease (M = 7.4/10; SD = 2.1) and utility (M = 8.1/10, SD = 1.6) of PP exercises highly. There were moderate pre-post improvements (ds = .46–.69) in positive affect, anxiety, and depression, but minimal effects on dispositional optimism (d = .08). Compared to TAU participants (n = 22), PP participants demonstrated greater improvements in positive affect, anxiety, and depression (ds = . 47–.71), but not optimism. A PP intervention was feasible, well-accepted, and associated with improvements in most psychological measures among cardiac patients. These results provide support for a larger trial focusing on behavioral outcomes.     

Exploring well-being among US Hispanics/Latinos in a church-based institution: a qualitative study

Major theories informing conceptions of psychological well-being draw heavily from Western-centric perspectives, which often neglect culturally bound frameworks. We investigated how US Hispanics/Latinos conceptualize well-being, how psychosocial and behavioral aspects may increase well-being, and how psychosocial stressors may impact positive emotional states. Spanish-speaking Hispanic/Latino adults were recruited from a church in an urban city in the US and invited to participate in focus groups. Two groups of women (n = 19) and one group of men (n = 8) participated. The importance of harmonious social relationships emerged as a theme with the central family unit as the fundamental force influencing long-lasting emotional well-being. Additional correlates of well-being included: faith/religiosity; physical health; self-love and -esteem; effective/open communication with family and friends; and financial security. Programs aimed at increasing well-being may need to be adapted before administration in Hispanics/Latinos to include a heightened focus on interpersonal factors. Delivery in religious institutions may also be particularly beneficial.     

The generality of the relation between familiarity and judged validity

Using factual information of uncertain truth value as the stimulus material, previous investigators have found that repeated statements are rated more valid than non-repeated statements. Experiments 1 and 1A were designed to determine if this effect would also occur for opinion statements and for statements initially rated either true or false. Subjects were exposed to a 108-statement list one week and a second list of the same length a week later. This second list was comprised of some of the statements seen earlier plus some statements seen for the first time. Results suggested that all types of repeated statements are rated as more valid than their non-repeated counterparts. Experiment 2 demonstrated that the validity-enhancing effect of repetition does not occur in subject domains about which a person claims not be knowledgeable. From the results of both studies we concluded that familiarity is a basis for the judged validity of statements. The relation between this phenomenon and the judged validity of decisions and predictions was also discussed.     

Acting out in the treatment situation

More and more frequently the deficiencies and deprivations of early life are seen in the inability of patients to utilize psychic process to ameliorate conflict and painful affect. As a result, the tendency to act out anger and violent feelings in the external world in ways that are destructive and damaging is a prominent symptom. In the course of therapy, this somatic expression enters the treatment situation itself, often directed to the person of the analyst as the transference object. Understanding dynamics of what is actually being reenacted and using this information to convert somatic language to psychic process is the central focus of this paper. Acting out is defined and what places it apart from other pathological symptoms is described, along with associated ego functions, triggering mechanisms, affects, narcissistic and preoedipal factors, speech and symbolization, and stability and quality of mental representations. Acting out has been linked to somatization in recent years, and is understood as a defense against hostile wishes and impulses in an attempt to eliminate internal dangers from awareness. Treatment focuses on moving acting out into the realm of talking out, free association, dream interpretation, and interpretation in general with the proper timing in assessing the patient's ability to transfer experiences with early objects onto the analyst.     

Inhibition of nitric oxide synthase impairs early olfactory associative learning in newborn rats

The present experiments examined the role of nitric oxide ( NO) in early associative olfactory learning in rats. A preference for peppermint odor was induced by pairing peppermint odor with tactile stimulation in Wistar rat pups, in either a repetitive training paradigm or in a one-trial olfactory learning paradigm. In a first experiment we studied the effect of nitric oxide synthase (NOs) inhibition on early olfactory learning in a repetitive paradigm, by systemic daily injections of NG-nitro-l-arginine methyl ester (l-NAME, 50 mg/kg, i.p.). In order to exclude possible deleterous effects of repeated injections of l-NAME, we explored in a second experiment the effect of a single inhibitor injection in a one-trial olfactory learning paradigm. Inhibition of NOs was performed by either administration of l-NAME (50 mg/kg, i.p.), or 7-nitroindazole (7-NI, 30 mg/kg, i.p.), a more selective inhibitor of the neuronal NOs. We showed that both l-NAME and 7-NI impaired early olfactory associative learning when given before training but not before subsequent testing. Considering that NOs neurons are already widespread in the central nervous system (the olfactory bulb included) during the first postnatal week, the sites where NO inhibition may have acted to impair olfactory learning are discussed. The mechanisms of action of NO in relation with other neurotransmitters known to be necessary for olfactory conditioning in rat pups remain to be established. Impairment by NO synthesis inhibition of the acquisition during the first postnatal week of an olfactory conditioning, but not its recall, suggests a role for NO at synapses involved in that learning.     

Religious Attendance and Volunteering: Testing National Culture as a Boundary Condition

Numerous studies have documented the importance of religion, and especially of religious congregational attendance, in regard to volunteering. Most of these studies focus on individual and contextual factors, usually within one country. Recent studies suggest that the association between religious attendance and volunteering varies among countries. We hypothesize that national culture plays an important role in explaining volunteering mainly as a moderator of the relationship between religious attendance and volunteering, especially on volunteering to help people in need. To support this position, we used individual‐level data from the World Values Survey (WVS) coupled with national data on cultural measures. This enabled assessment of these relationships using a multilevel analysis of individuals nested in countries. We used two models of national culture, Hofstede (1984) and WVS to explain the differences between countries. We found direct relationships between national culture constructs (power distance and survival/self‐expression values) and volunteering. We also found that individualism, power distance, and survival/self‐expression values moderated the effect of religion on volunteering, with a stronger relationship between religious attendance and volunteering in nationalities with self‐expression values, high power distance, and low individualism. Theoretical and practical implications of this approach are discussed.     

Spotlight on Age‐Diversity Climate: The Impact of Age‐Inclusive HR Practices on Firm‐Level Outcomes

This study investigates the emergence and the performance effects of an age‐diversity climate at the organizational level of analysis. Building upon Kopelman and colleagues’ (Kopelman, Brief, & Guzzo, 1990 ) climate model of firm productivity as well as Cox's ( 1994 ) interactional model of cultural diversity, we hypothesize a positive influence of age‐inclusive HR practices on the development of an organization‐wide age‐diversity climate, which in turn should be directly related to collective perceptions of social exchange and indirectly to firm performance and employees’ collective turnover intentions. The assumed relationships are tested in a sample of 93 German small and medium‐sized companies with 14,260 employees participating. To circumvent common source problems, information for the various constructs was gathered from 6 different sources. To test our assumed relationships, we applied structural equation modeling and executed bootstrapping procedures to test the significance of the indirect effects. We received support for all assumed relationships. The paper concludes with practical recommendations on how to establish and make use of a positive age‐diversity climate.