Renewal and resurgence phenomena generalize to Amazon's Mechanical Turk

Amazon's Mechanical Turk (MTurk) is a crowdsourcing platform that provides researchers with the potential for obtaining behavioral data for very little cost. However, the extent to which the results of common behavioral phenomena found in basic, translational, and applied laboratories may be reproduced (as a first step towards prospective research) via MTurk remains relatively unexplored. We evaluated renewal and resurgence arrangements using MTurk as the subject recruitment platform as a first step to determining the generality of the obtained data. Results suggested that MTurk participants produced renewal and resurgence data similar to those reported in basic, translational, and applied studies.     

Synchronizing movements with the metronome: nonlinear error correction and unstable periodic orbits.

The control of human hand movements is investigated in a simple synchronization task. We propose and analyze a stochastic model based on nonlinear error correction; a mechanism which implies the existence of unstable periodic orbits. This prediction is tested in an experiment with human subjects. We find that our experimental data are in good agreement with numerical simulations of our theoretical model. These results suggest that feedback control of the human motor systems shows nonlinear behavior.     

The Use of Acceptance and Commitment Therapy to Promote Mental Health and School Engagement in University Students: A Multisite Randomized Controlled Trial

The aim of this multisite randomized controlled trial was to determine whether an intervention based on Acceptance and Commitment Therapy (ACT) was efficacious in improving university students’ psychological flexibility, mental health, and school engagement. Students were recruited in four Canadian universities and randomly assigned to an intervention (n = 72) or a wait-list control group (n = 72). Students in the intervention group took part in four 2.5-hour workshops during a 4-week period and were asked to do exercises at home (e.g., meditation, observation grids). Wait-list students received the intervention soon after the post measurements. MANCOVAs and ANCOVAs revealed that students in the intervention group showed greater psychological flexibility at postintervention than those in the control group. They also reported greater well-being and school engagement, and lower stress, anxiety, and depression symptoms. Taken together, results of this study suggest that an ACT-based intervention offers a valuable way to promote mental health and school engagement in postsecondary settings.     

The two landscapes of northern Norway

Our concepts of the world come from our common activities in the world. Without coastal fishing, or seafaring, in boats too large for their crews to draw them ashore, there is no place for the concept of a harbour. And without reindeer herding, there will be no concept of JASSA. That is one point. The other is this: without some of the coastal fisherman's skill and local knowledge, you will not be able to recognize a natural harbour when you see one. And without the reindeer herder's skill, you will not be able to recognize a JASSA when you see one. To put it all rather bluntly. Though there is more of both work and experience behind the first part of this article, about the world of coastal fishing, most of my academic friends have found the latter part, about the concept JASSA, the better and more readable. Can it be that the better teacher is the one who has just learnt the lesson himself?     

Spinoza's theory of knowledge

This paper is a discussion of which kinds of knowledge Spinoza himself employs in developing the system of the Ethics. The problem is raised by Professor D. Savan and further discussed by G. H. R. Parkinson. The thesis is (1) that no occurrence of the first kind of knowledge is to be found in the Ethics (against Parkinson), (2) that the main part of the analysis in the Ethics is conducted on the level of the second kind of knowledge (in agreement with Parkinson), and (3) that the third kind of knowledge occurs frequently and plays a most important role in the Ethics (in part against Parkinson). The relation between knowledge and language, the distinction between two types of imagination, or two ways of imagining things, the translation of knowledge of modes of extension into knowledge of the mind, and the relation between the second and third kind of knowledge are main parts of the argument. The third kind of knowledge derives its significance in the Ethics from the definitions and axioms, particularly in Part 1. These definitions and axioms form the basis of the whole system of the Ethics, and at least some of them, it is suggested, belong to the third kind of knowledge.     

In the Wake of Violence: Enacting and Witnessing Hope Among People

In the territory of violence and despair, hope is rare. Recent work on hope has shifted attention from hope as a feeling to hope as a practice that people can do together. This case report of a family exposed to domestic violence highlights the role played by a South African police officer in the mother's actions to separate from the context of violence. As a witness to the violence, the police officer acted from an ethic of justice and an ethic of compassion. Outsider witnessing of a counseling session resulted in the recruiting of a community of acknowledgement for the mother, the police officer, and an Assistant Commissioner of Police. Listening carefully and doing hope together gave rise to alliances against practices of violence. As a step of accountability, the authors used reflexive practices to question their responses and to avoid colonizing practices.     

The Motivational Roots of Norms for Environmentally Responsible Behavior

We assessed whether people use a magnitude-matching principle in determining causes for complex social events. We hypothesized that individuals tend to favor causal explanations that match the event in terms of size and scope. In Experiment 1, the magnitude of the consequences of events was manipulated, and participants were presented with two potential causes of modest magnitude and two potential causes of high magnitude. Analyses revealed a relative magnitude-matching effect such that participants were more likely to select high magnitude causes for large magnitude events than modest magnitude events and more likely to select modest magnitude causes for modest magnitude events than large magnitude events. Experiment 2 replicated the magnitude-matching effect with a different event and set of causes, and demonstrated that this effect could be reversed by undermining participants' beliefs in the magnitude-matching principle.     

Memory for a staged criminal event witnessed live and on video

Memory for a staged robbery was tested in two groups of participants witnessing the event either live (n = 62) or on video (n = 64). Immediately after the event participants filled out a questionnaire probing memory with emphasis on the timing of the event and robber characteristics. The results showed that participants who watched a video recording of the event reported more details and with a higher accuracy than participants who were present on the scene, but the pattern of memory errors were similar in the two conditions. It is concluded that laboratory experiments may overestimate the memory of eyewitnesses but are otherwise able to simulate essential aspects of memory performance in naturalistic contexts.