Risky business: emotion,decision-making,and addiction

Although metabolic abnormalities in the orbitofrontal cortex have been observed in substance dependent individuals (SDI) for several years, very little attention was paid to the role of this brain region in addiction. However, patients with damage to the ventromedial (VM) sector of the prefrontal cortex and SDI show similar behaviors. (1) They often deny, or they are not aware, that they have a problem. (2) When faced with a choice to pursue a course of action that brings an immediate reward at the risk of incurring future negative consequences, they choose the immediate reward and ignore the future consequences. Studies of patients with bilateral lesions of the VM prefrontal cortex support the view that the process of decision-making depends in many important ways on neural substrates that regulate homeostasis, emotion, and feeling. Parallel lines of study have revealed that VM cortex dysfunction is also evident in subgroups of individuals who are addicted to substances. Thus, understanding the neural mechanisms of decision-making has direct implications for understanding disorders of addiction and pathological gambling, and the switch from a controlled to uncontrolled and compulsive behavior. On the clinical front, the approach to treat addictive disorders has been dominated by a diagnostic system that focuses on behaviors, physical symptoms, or choice of drugs. The article emphasizes the concept of using neurocognitive criteria for subtyping addictive disorders. This is a significant paradigm shift with significant implications for guiding diagnosis and treatment. Using neurocognitive criteria could lead to more accurate subtyping of addictive disorders, and perhaps serve as a guide for more specific, and potentially more successful, behavioral and pharmacological interventions.     

Structural landscape changes in urban and peri-urban agricultural systems of two West African cities and their relations to ecosystem services provided by woody plant communities

Urban Ecosystems - High urbanization pressure in Sub-Saharan Africa led to changes in the composition and configuration of rural and peri-urban agricultural production systems and to the...     

Estimation of cyclic long-memory parameters

This paper studies cyclic long-memory processes with Gegenbauer-type spectral densities. For a semiparametric statistical model, new simultaneous estimates for singularity location and long-memory parameters are proposed. This generalized filtered method-of-moments approach is based on general filter transforms that include wavelet transformations as a particular case. It is proved that the estimates are almost surely convergent to the true values of parameters. Solutions of the estimation equations are studied, and adjusted statistics are proposed. Monte-Carlo study results are presented to confirm the theoretical findings.     

On the Processes Underlying the Relationship Between Alexithymia and Gambling Severity

A great number of individuals with persistent problematic gambling behavior exhibit alexithymic tendencies, greater impulsivity, impaired working memory and poor mood. However, the relationship between these cognitive, affective and personality factors in problem gambling remains poorly understood. Our aim was to investigate multiple pathways of the alexithymia and problem gambling relationship. One hundred and six male subjects with different levels of gambling problem severity were recruited. Alexithymia, impulsivity and verbal working memory were evaluated, and their relationships to disordered gambling was examined by means of a path analysis. Results indicate that alexithymia is related to an increase in the severity of gambling indirectly, i.e., through distress severity. In addition, a rise of alexithymic tendencies was also associated with problem gambling severity through enhanced impulsivity that directly increased distress. Working memory capacity failed to significantly impact our path model. Overall, our findings contribute a new finding to the literature by highlighting the importance of alexithymia, in addition to impulsivity, in the understanding of gambling problem severity and its clinical course.     

Feeling Attached and Feeling Accepted: Implications for Political Inclusion among Visible Minority Immigrants in Canada

Immigrants’ sense of belonging to their host communities is viewed as a core condition for their successful inclusion, but there is no consensus on which attributes of belonging are most relevant to understanding inclusion, nor is there agreement on how the sense of belonging ought to be measured empirically. This study examines how two related but independent dimensions of belonging help to better understand the political inclusion of visible minority immigrants in Canada. More specifically, it examines the role of feeling attached (immigrants’ feeling toward the host community) and the role of feeling accepted (immigrants’ sense of how their host communities feel about them). We assess the relationship between attachment, acceptance and political inclusion for both first- and second-generation visible minority Canadians; the results suggest there is analytical value in utilising separate measures of attachment and acceptance: political inclusion is more likely when both are stronger.     

Use and Misuse of Indicators in Spatial Planning: The Example of Land Take

The use of indicators to assess the impacts of spatial planning policies has experienced a strong increase in the last decades, despite the difficulties to identify clear causality links in this discipline. The aim of this article is to critically reflect on the impacts of such a phenomenon on spatial planning policies and practices. In order to do so, it explores the issue of land take and how the European Community has set up a policy objective, based on an indicator, to try to tackle the phenomenon.     

Global Development Goals: The Folly of Technocratic Pretensions

This article argues that, although effective strategic choices for achieving global development goals need to be based on assessments of the costs and benefits of alternative approaches, existing methods of arriving at such assessments are highly unreliable, in particular deriving from implausible and restrictive assumptions and often depending on data of poor quality, and on the pretence that the future can be adequately known. Such weaknesses can be mitigated, but not easily overcome, without abandoning deeply held technocratic presumptions.     

Self-Employment and Immigrants' Incorporation: The Case of Turks in Germany

This essay discusses the impact of self-employment on immigrants' incorporation in the host society. It focuses on empirical material coming from Turkish migrants' business activities in Germany. After introducing the main features of contemporary German-Turkish entrepreneurship, the essay presents its socio-economic and cultural consequences for the Turkish minority. Relying on the numerous debates that can be found in the literature, it argues that this impact is ambivalent. In some cases, business ownership may constitute a way of achieving upward social mobility and a path towards a harmonious and pluralistic integration. But it is also frequently a reaction to disadvantage that fosters immigrants' socio-professional vulnerability and that may then lead to ghettoization. The essay then attempts to understand the reasons behind these divergent interpretations and suggests that they lie in the intermediary nature of trade, which is an activity that may connect people from different backgrounds but only in a limited way. Ethnographic observations and the concept of ‘plural societies’ are used to address this aspect of business. The conclusion suggests that, given the globally inferior position of Turkish immigrants, business might not be enough to enable them to catch up.     

Impaired Metacognitive Capacities in Individuals with Problem Gambling

Impaired insight into behavior may be one of the clinical characteristics of pathological gambling. In the present study, we tested whether the capacity to evaluate accurately the quality of one’s own decisions during a non-gambling task was impaired in problem gamblers. Twenty-five problem gamblers and 25 matched healthy participants performed an artificial grammar-learning paradigm, in which the quality of choice remains uncertain throughout the task. After each trial of this task, participants had to indicate how confident they were in the grammaticality judgements using a scale ranging from 1 (low confidence) to 7 (high confidence). Results showed that (i), problem gamblers’ performance on the grammaticality test was lower than controls’; (ii) there was a significant correlation between grammaticality judgments and confidence for control participants, which indicates metacognitive insight and the presence of conscious knowledge; (iii) this correlation was not significant in problem gamblers, which suggests a disconnection between performance and confidence in this group. These findings suggest that problem gamblers are impaired in their metacognitive abilities on a non-gambling task, which suggests that compulsive gambling is associated with poor insight as a general factor. Clinical interventions tailored to improve metacognition in gambling could be a fruitful avenue of research in order to prevent pathological gambling.     

Cognitive rationality and alternative belief measures

In this article, we first examine the various criticisms of the probabilistic model. Then we introduce capacities in order to show that if a probability measure corresponds to anesthetizing the belief of the agent's knowledge, it is then possible to suggest another type of rationality—namely, being able to describe a wise and a rash behavior when facing risk—and therefore another model of belief under uncertainty. While trying to specify various alternative measures, possibility, necessity, and measures resulting from a triangular norm or from a triangular conorm, we finally try to define the field of application of the probabilistic model as well as a sign of the rationality choice: constraint of mass-unity for traditional rationality, and constraint of duality for the one we present.This article is a revised version of a paper presented during the FUR V Congress, Duke University, North Carolina, USA, June 10–13, 1990. I am indebted to Bertrand Munier, Alain Chateauneuf, Olivier Favereau, Jacques-François Thisse, Bernard Walliser, and Kip Viscusi for helpful comments on earlier versions of this article.