Stimulus generalization, discrimination learning, and peak shift in horses.

Using horses, we investigated three aspects of the stimulus control of lever-pressing behavior: stimulus generalization, discrimination learning, and peak shift. Nine solid black circles, ranging in size from 0.5 in. to 4.5 in. (1.3 cm to 11.4 cm) served as stimuli. Each horse was shaped, using successive approximations, to press a rat lever with its lip in the presence of a positive stimulus, the 2.5-in. (6.4-cm) circle. Shaping proceeded quickly and was comparable to that of other laboratory organisms. After responding was maintained on a variable-interval 30-s schedule, stimulus generalization gradients were collected from 2 horses prior to discrimination training. During discrimination training, grain followed lever presses in the presence of a positive stimulus (a 2.5-in circle) and never followed lever presses in the presence of a negative stimulus (a 1.5-in. [3.8-cm] circle). Three horses met a criterion of zero responses to the negative stimulus in fewer than 15 sessions. Horses given stimulus generalization testing prior to discrimination training produced symmetrical gradients; horses given discrimination training prior to generalization testing produced asymmetrical gradients. The peak of these gradients shifted away from the negative stimulus. These results are consistent with discrimination, stimulus generalization, and peak-shift phenomena observed in other organisms.     

Hyperbolic modeling and assessment of hypothetical health behaviors during a viral outbreak using crowdsourced samples

The COVID-19 pandemic provided an opportunity to investigate factors related to public response to public health measures, which could help better prepare implementation of similar measures for inevitable future pandemics. To understand individual and environmental factors that influence likelihood in engaging in personal and public health measures, three crowdsourced convenience samples from Amazon Mechanical Turk (MTurk) completed likelihood-discounting tasks of engaging in health behaviors given a variety of hypothetical viral outbreak scenarios. Experiment 1 assessed likelihood of mask wearing for a novel virus. Experiment 2 assessed vaccination likelihood based on efficacy and cost. Experiment 3 assessed likelihood of seeking health care based on number of symptoms and cost of treatment. Volume-based measures and three-dimensional modeling were used to analyze hypothetical decision making. Hypothetical public and personal health participation increased as viral fatality increased and generally followed a hyperbolic function. Public health participation was moderated by political orientation and trust in science, whereas treatment-seeking was only moderated by income. Analytic methods used in this cross-sectional study predicted population-level outcomes that occurred later in the pandemic and can be extended to various health behaviors.     

Civic engagement and the possibility of the political

During the last half a century, civil rights movements have been led by people of faith even as they have marched in different directions. Some spoke out for the status quo while others demanded a different vision of justice, some for peace and others for war, for a violence-free life for women and against it. The issues and partisans shift, particularly as the relationship between state and church, faith and politics, has varied from one country to the next. Participation is dangerous, but even more so are inaction, withdrawal, obedience. This issue of Dialog takes another look at the history, philosophy, and practice of Christians.     

Relationship assessment in infant mental health

Infant-caregiver relationships are the crucial context for infant development and psychopathology. Considerable evidence suggests that infants may construct qualitatively different relationships with different caregivers. For these reasons, infant-caregiver relationships should be a centerpiece of assessment in infant mental health. We advocate assessing infant relationships with all important caregivers in both clinic based and naturalistic settings. In this article we describe our approach, which attends both to the external component of the relationship, behavioral interaction, as well as the internal component of the relationship, subjective experience. By integrating results from assessments of these two components, we determine both level of relationship adaptation and the specific domains of strengths and weaknesses. © 1997 Michigan Association for Infant Mental Health     

The importance of including quality-of-life indices in international social and economic development activities

Psychology has not been a visible player in international social and economic development efforts. Through its demonstrated commitment to the concept of quality of life, psychology has an opportunity to help shape foreign policy and to improve the lives of countless people around the globe. Poverty has reached unacceptable limits of humanitarian tolerance and political consequence throughout the world. The United Nations estimates that 20% of the world's population now lives in conditions of absolute poverty in which there is an absence of even the bare essentials for living. Social and economic development efforts have often failed despite good intentions because they have often concentrated on improving peoples' material level of living but not their quality of life. This article addresses the need to include quality-of-life (QOL) indices in international social and economic development efforts. In addition, the article calls attention to the need to use valid cross-cultural measurement strategies (i.e., culturally equivalent) when assessing QOL across cultural and national boundaries. Current approaches to social and economic development rely heavily on interventions that do not reflect the actual peoples' perceptions of life satisfaction and subjective well-being. Self-serving political and economic national interests have kept new approaches to development from being implemented. New interventions must be holistic, decentralized, integrated, empowering, participatory, and human-resource directed, and must include culturally equivalent objective and subjective quality-of-life indices as the arbiters of success.     

Psychosocial job strain and productivity in human service workers: A test of the demand-control-support model

The aim of the study was to test the main and interactive effects of the key dimensions of the demand-control-support model in predicting levels of strain (specifically emotional exhaustion, depersonalization and job dissatisfaction) and feelings of productivity and competency (personal accomplishment) in a multi-occupational sample of human service workers (N = 813). Controlling for demographics, negative affectivity (NA), and quadratic terms, structural equation analyses showed some support for the additive iso-strain hypothesis: jobs combining high demands, low control and low support produced the lowest levels of satisfaction in workers. High demands and low supports only were associated with high depersonalization, and high emotional exhaustion. Support was also found for the additive active learning hypotheses: jobs combining high demands and high control produced the highest levels of personal accomplishment. The study supports job redesign interventions for improving worker well-being and productivity.