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Neurocognitive Effects of Transcranial Direct Current Stimulation in Arithmetic Learning and Performance: A Simultaneous tDCS-fMRI Study

BACKGROUND A small but increasing number of studies suggest that non-invasive brain stimulation by means of transcranial direct current stimulation (tDCS) can modulate arithmetic processes that are essential for higher-order mathematical skills and that are impaired in dyscalculic individuals. However, little is known about the neural mechanisms underlying such stimulation effects,…

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English / 20/07/2016

«Vermögenskonzentration ist konstant geblieben»

Wirtschaftsprofessor David Dorn über die Gründe für die zunehmende Lohnungleichheit in der Schweiz

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Deutsch / 14/07/2016

Time, not size, matters for striatal reward predictions to dopamine

Midbrain dopamine neurons encode reward prediction errors. In this issue of Neuron, Takahashi et al. (2016) show that the ventral striatum provides dopamine neurons with prediction information specific to the timing, but not the quantity, of reward, suggesting a surprisingly nuanced neural implementation of reward prediction errors.

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English / 06/07/2016

Dopamine D2/3- and μ-opioid receptor antagonists reduce cue-induced responding and reward impulsivity in humans

Increased responding to drug-associated stimuli (cue reactivity) and an inability to tolerate delayed gratification (reward impulsivity) have been implicated in the development and maintenance of drug addiction. Whereas data from animal studies suggest that both the dopamine and opioid system are involved in these two reward-related processes, their role in humans is less clear.…

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English / 05/07/2016

Re-insurance in the Swiss health insurance market

Risk equalization mechanisms mitigate insurers’ incentives to practice risk selection. On the other hand, incentives to limit healthcare spending can be distorted by risk equalization, particularly when risk equalization payments depend on realized costs instead of expected costs. In addition, cost based risk equalization mechanisms may incentivize health insurers to distort the…

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English / 01/07/2016

Deficits in context-dependent adaptive coding of reward in schizophrenia

Theoretical principles of information processing and empirical findings suggest that to efficiently represent all possible rewards in the natural environment, reward-sensitive neurons have to adapt their coding range dynamically to the current reward context. Adaptation ensures that the reward system is most sensitive for the most likely rewards, enabling the system to efficiently…

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English / 15/06/2016

Indexfonds und Monopolbildung

Die von den grössten amerikanischen Indexfonds gesammelten Mittel sind enorm, ihr Einfluss dementsprechend. Es entsteht die Befürchtung, dass der Wettbewerb in manchen Sektoren darunter leidet.

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Deutsch / 04/06/2016

Agricultural productivity and structural transformation : evidence from Brazil

We study the effects of the adoption of new agricultural technologies on structural transformation. To guide empirical work, we present a simple model where the effect of agricultural productivity on industrial development depends on the factor bias of technical change. We test the predictions of the model by studying the introduction of genetically engineered soybean seeds in Brazil…

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English / 01/06/2016

Doubt in the insula: risk processing in obsessive-compulsive disorder

Extensive cleaning or checking of patients with obsessive-compulsive disorder (OCD) are often interpreted as strategies to avoid harm and as an expression of the widespread belief that OCD patients are more risk-averse. However, despite its clinical significance, the neural basis of risk attitude in OCD is unknown. Here, we investigated neural activity during risk processing using…

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English / 01/06/2016

Learning what to see in a changing world

Visual perception is strongly shaped by expectations, but it is poorly understood how such perceptual expectations are learned in our dynamic sensory environment. Here, we applied a Bayesian framework to investigate whether perceptual expectations are continuously updated from different aspects of ongoing experience. In two experiments, human observers performed an associative…

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English / 31/05/2016

«Zwei Millionen US-Arbeitsplätze sind abgebaut worden» : Wahlkampf und Wirtschaft in den USA

Billige Importe aus China haben in den USA zu einem gewaltigen Verlust an Jobs in der Industrie geführt, sagt der Zürcher Ökonom David Dorn. Die Betroffenen wählten häufig weit rechts oder weit links.

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Deutsch / 22/05/2016

INTERVIEW Was Menschen für Geld tun «Die Arbeit geht uns nicht aus»

Der technische Fortschritt vernichtet Arbeitsplätze und schafft neue. Über die Entwicklung der Arbeitswelt sprachen Roger Nickl und Thomas Gull mit der Historikerin Brigitta Bernet und dem Ökonomen David Dorn.

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Deutsch / 09/05/2016

"Die Arbeit geht uns nicht aus"

Der technische Fortschritt vernichtet Arbeitsplätze und schafft neue. Über die Entwicklung der Arbeitswelt sprachen Roger Nickl und Thomas Gull mit der Historikerin Brigitta Bernet und dem Ökonomen David Dorn.

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Deutsch / 09/05/2016

An externality-robust auction: Theory and experimental evidence

Behavioral robustness is essential in mechanism design. Existing papers focus on robustness as captured by dominant strategies. This paper studies the novel concept of externality-robustness, which addresses players' motives to affect other players' monetary payoffs. One example is externalities due to spite, which has been used to explain overbidding in second-price…

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English / 01/05/2016

Ventral striatal hypoactivation is associated with apathy but not diminished expression in patients with schizophrenia

BACKGROUND: Negative symptoms of schizophrenia can be grouped in 2 dimensions: apathy and diminished expression. Increasing evidence suggests that negative symptoms are associated with altered neural activity of subcortical and cortical regions in the brain reward system. However, the neurobiological basis of the distinct symptom dimensions within negative symptoms is still poorly…

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English / 01/05/2016

Inequality in mortality decreased among the young while increasing for older adults, 1990–2010

Many recent studies point to increasing inequality in mortality in the United States over the past 20 years. These studies often use mortality rates in middle and old age. We used poverty level rankings of groups of U.S. counties as a basis for analyzing inequality in mortality for all age groups in 1990, 2000, and 2010. Consistent with previous studies, we found increasing…

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English / 01/05/2016

Ungleichheit und Wachstum

Zunehmende Ungleichheit gefährdet künftiges Wachstum, weil sie den gesellschaftlichen Zusammenhalt 
schwächt und Unterstützung für schädliche politische Strömungen schafft.

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Deutsch / 27/04/2016

Ventral pallidum encodes contextual information and controls aversive behaviors

Successful avoidance of aversive outcomes is crucial for the survival of animals. Although accumulating evidence indicates that an indirect pathway in the basal ganglia is involved in aversive behavior, the ventral pallidum (VP), which is an important component of this pathway, has so far been implicated primarily in appetitive behavior. In this study, we used single-cell recordings…

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English / 24/04/2016

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