Bayesian inference for the information gain model

One of the most popular paradigms to use for studying human reasoning involves the Wason card selection task. In this task, the participant is presented with four cards and a conditional rule (e.g., “If there is an A on one side of the card, there is always a 2 on the other side”). Participants are asked which cards should be turned to verify whether or not the rule holds. In this simple task, participants consistently provide answers that are incorrect according to formal logic. To account for these errors, several models have been proposed, one of the most prominent being the information gain model (Oaksford & Chater, Psychological Review, 101, 608–631, 1994). This model is based on the assumption that people independently select cards based on the expected information gain of turning a particular card. In this article, we present two estimation methods to fit the information gain model: a maximum likelihood procedure (programmed in R) and a Bayesian procedure (programmed in WinBUGS). We compare the two procedures and illustrate the flexibility of the Bayesian hierarchical procedure by applying it to data from a meta-analysis of the Wason task (Oaksford & Chater, Psychological Review, 101, 608–631, 1994). We also show that the goodness of fit of the information gain model can be assessed by inspecting the posterior predictives of the model. These Bayesian procedures make it easy to apply the information gain model to empirical data. Supplemental materials may be downloaded along with this article from .     

Exaggeration is harder than understatement, but practice makes perfect!

Previous research on the fakeability of the Implicit Association Test (IAT) yielded inconsistent results. The present study simultaneously analyses several relevant factors: faking direction, type of instructions, and practice. Furthermore, it takes baseline individual differences into account. After a baseline assessment in a self-esteem IAT without faking instructions (t0), participants in the faking conditions then (t1) faked high or low scores without being provided with recommended strategies on how to do so (i.e., individual strategies). At t2 and t3, they were asked to fake the IAT after having received information on recommended faking strategies. At t4, faking direction was reversed. Without the recommended strategies, faking high scores was not possible, but faking low scores was. With the recommended strategies, participants needed additional practice to fake high scores. When faking directions were reversed, participants were successful without additional practice, suggesting a transfer in faking skills. In most of the faking attempts, faking success was moderated by individual differences in baseline implicit self-esteem. This suggests that the complex interplay of factors influencing faking success should be taken into account when considering the issue of fakeability of the IAT.     

Response-retrieval and negative priming

The existence of across-notation automatic numerical processing of two-digit (2D) numbers was explored using size comparisons tasks. Participants were Arabic speakers, who use two sets of numerical symbols—Arabic and Indian. They were presented with pairs of 2D numbers in the same or in mixed notations. Responses for a numerical comparison task were affected by decade difference and unit-decade compatibility and global distance in both conditions, extending previous findings with Arabic digits (Nuerk, Weger, & Willmes, 2001). Responses for a physical comparison task were affected by congruency with the numerical size, as indicated by the size congruency effect (SiCE). The SiCE was affected by unit-decade compatibility but not by global distance, thus suggesting that the units and decades digits of the 2D numbers, but not the whole number value were automatically translated into a common representation of magnitude. The presence of similar results for same- and mixed-notation pairs supports the idea of an abstract representation of magnitude.     

��Does Plagiarism Mean anything? LOL.�� Students�� Conceptions of Writing and Citing

This study focuses on the intersection of research ethics and academic writing, i.e. the use of sources, assignment of credit to the contributors in the research, and the dissemination of research findings. The study utilized a set of semi-structured and open-ended questions. The sample consisted of 269 undergraduate (BA) and graduate (MA) students at a U.S. university department of psychology including major and non-major students. The data showed that although an overwhelming number of the students’ examples related to ethical issues in citation dealt with plagiarism, a broad range of examples of other types of issues were also provided. Understandably, students tended to view the questions about both the assignment of credit to those involved in conducting the research and the dissemination of research findings from the research participant’s perspective, which is more familiar to them than the researcher perspective. In order to help the students to expand their notions beyond the immediate own experience to a broader understanding for the ethical principles that ought to guide a researcher in his or her work, it is desirable that students be provided with opportunities to participate in authentic research projects. With a deeper understanding of the students’ conceptions of ethics in research and academic writing, we can become more attuned to the common limitations and misconceptions that students harbor, and thus better equipped to support students in their learning process.     

Action-induced effects on perception depend neither on element-level nor on set-level similarity between stimulus and response sets

As was shown by Wykowska, Schubö, and Hommel (Journal of Experimental Psychology, Human Perception and Performance, 35, 1755–1769, 2009), action control can affect rather early perceptual processes in visual search: Although size pop-outs are detected faster when having prepared for a manual grasping action, luminance pop-outs benefit from preparing for a pointing action. In the present study, we demonstrate that this effect of action–target congruency does not rely on, or vary with, set-level similarity or element-level similarity between perception and action—two factors that play crucial roles in standard stimulus–response interactions and in models accounting for these interactions. This result suggests that action control biases perceptual processes in specific ways that go beyond standard stimulus–response compatibility effects and supports the idea that action–target congruency taps into a fundamental characteristic of human action control.     

On ‘Doing’ Memory and Self in Different Cultural Contexts

After a brief and pointed recapitulation of the main issues of Demuth, Chaudhary and Keller’s article, Memories of me. Comparisons from Osnabrück (Germany) and Delhi (India) students and their mothers (doi:), alternative or complementary approaches to the investigation of ‘doing’ memory and self in different cultural contexts are outlined in a sketch of three interrelated proposals. These proposals turn around a) ‘contemporaneousness of the non-contemporaneous’ (Gleichzeitigkeit des Ungleichzeitigen) and the analysis of ‘cultural hybrids’, b) ‘indigenous concepts of memory and self’ and c) ‘memory and self in actual cultural practice’.     

The role of encoding strategies in the verbal memory performance in patients with schizophrenia

Background. Verbal learning and memory is often compromised in patients with schizophrenia who prefer encoding words in order of their presentation (serial clustering) rather than using semantic categories (semantic clustering). Method. One hundred and four in‐patients with schizophrenia were assessed twice with the California Verbal Learning Test. Results. Patients showed significantly less semantic than serial clustering at both assessment times. Usage of encoding strategies were not stable over time. An increase in semantic clustering improved recall and recognition performance. Conclusions. Patients with schizophrenia should be taught to use the more effective encoding strategy of semantic clustering in order to improve their memory performance.     

Was und wie häufig sind Fehlurteile?

Spectacular trials leading to alleged or proven wrongful convictions arouse the concern of the German public. In spite of that there is no current systematic analysis of sources of error in criminal procedures. This article defines what may be recognized as a wrongful conviction or wrongful decision and gives an account of studies on wrongful convictions in America and some European countries. Concerning the German situation, firstly possible sources of error in preliminary proceedings are highlighted and then the outcomes of appeals are analyzed, thus estimating the quantity of wrongful convictions by courts in the first instance on the basis of statistical data. Furthermore, the very restrictive prerequisites for retrials are discussed. Concluding, the author argues for a systematic empirical analysis of sources of error in criminal proceedings and a facilitation of the prerequisites for retrials.     

Die Rehabilitation von Straftätern

The rehabilitation of offenders in English-speaking countries is primarily guided by a risk management framework (the risk-need-responsivity principles: RNR model), which aims at reducing the possibility of harm to the community rather than improving offenders’ quality of life. In the last decade Tony Ward and his colleagues have developed the good lives model of offender rehabilitation (GLM) as an alternative to the RNR model. The GLM incorporates the RNR principles of risk, need and responsivity into its theoretical structure while aiming to provide a more constructive and comprehensive approach to correctional practice. More specifically, it aims to both reduce risk while enhancing the quality of offenders’ lives. The present article aims at outlining the general, etiological assumptions and practice implications of the GLM. In addition, its strengths and limitations and evidence base are reported. These illustrations highlight the usefulness of the GLM for the treatment of offenders and sex offenders in particular.