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Disentangling neural representations of value and salience in the human brain

A large body of evidence has implicated the posterior parietal and orbitofrontal cortex in the processing of value. However, value correlates perfectly with salience when appetitive stimuli are investigated in isolation. Accordingly, considerable uncertainty has remained about the precise nature of the previously identified signals. In particular, recent evidence suggests that...

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English / 01/01/2014

Activity in dlPFC and its effective connectivity to vmPFC are associated with temporal discounting

There is widespread interest in identifying computational and neurobiological mechanisms that influence the ability to choose long-term benefits over more proximal and readily available rewards in domains such as dietary and economic choice. We present the results of a human fMRI study that examines how neural activity relates to observed individual differences in the discounting of...

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English / 01/01/2014

Fast construction of voxel-level functional connectivity graphs

Background: Graph-based analysis of fMRI data has recently emerged as a promising approach to study brain networks. Based on the assessment of synchronous fMRI activity at separate brain sites, functional connectivity graphs are constructed and analyzed using graph-theoretical concepts. Most previous studies investigated region-level graphs, which are computationally inexpensive, but...

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English / 01/01/2014

Case Report: Practicability of functionally based tractography of the optic radiation during presurgical epilepsy work up

Pre-operative tractography of the optic radiation (OR) has been advised to assess the risk for postoperative visual field deficit (VFD) in certain candidates for resective epilepsy surgery. Diffusion tensor imaging (DTI) tractography relies on a precise anatomical determination of start and target regions of interest (ROIs), such as the lateral geniculate nucleus (LGN) and the...

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English / 01/01/2014

Neural oscillations and synchronization differentially support evidence accumulation in perceptual and value-based decision making

Organisms make two types of decisions on a regular basis. Perceptual decisions are determined by objective states of the world (e.g., melons are bigger than apples), whereas value-based decisions are determined by subjective preferences (e.g., I prefer apples to melons). Theoretical accounts suggest that both types of choice involve neural computations accumulating evidence for the...

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English / 01/01/2014

A game theoretic fundation of competitive quilibria with adverse selection

We construct an extensive form game that captures competitive markets with adverse selection. It allows firms to offer any finite set of contracts, so that cross-subsidization is not ruled out. Moreover, firms can withdraw from the market after initial contract offers have been observed. We show that a subgame perfect equilibrium always exists. In fact, when withdrawal is costless,...

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English / 01/01/2014

Culture, entrepreneurship, and growth

We discuss the two-way link between culture and economic growth. We present a model of endogenous technical change where growth is driven by the innovative activity of entrepreneurs. Entrepreneurship is risky and requires investments that affect the steepness of the lifetime consumption profile. As a consequence, the occupational choice of entrepreneurship hinges on risk tolerance...

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English / 01/01/2014

Return of the Solow Paradox? IT, Productivity, and Employment in US Manufacturing

An increasingly influential "technological-discontinuity" paradigm suggests that IT-induced technological changes are rapidly raising productivity while making workers redundant. This paper explores the evidence for this view among the IT-using US manufacturing industries. There is some limited support for more rapid productivity growth in IT-intensive industries depending...

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English / 01/01/2014

Seeking the roots of entrepreneurship: Insights from behavioral economics†

There is a growing body of evidence that many entrepreneurs seem to enter and persist in entrepreneurship despite earning low risk-adjusted returns. This has lead to attempts to provide explanations—using both standard economic theory and behavioral economics—for why certain individuals may be attracted to such an apparently unprofitable activity. Drawing on research in behavioral...

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English / 01/01/2014

Teens impulsively react rather than retreat from threat

There is a significant inflection in risk taking and criminal behavior during adolescence, but the basis for this increase remains largely unknown. An increased sensitivity to rewards has been suggested to explain these behaviors, yet juvenile offences often occur in emotionally charged situations of negative valence. How behavior is altered by changes in negative emotional processes...

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English / 01/01/2014

The consumption–income ratio, entrepreneurial risk, and the U.S. stock market

The owners of small noncorporate businesses face substantial and largely uninsurable entrepreneurial risk. They are also an important group of stock owners. This paper explores the role of entrepreneurial risk in explaining time variation in expected U.S. stock returns in the period 1952–2010. It proposes an entrepreneurial distress factor that is based on a cointegrating...

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English / 01/01/2014

Rethinking reciprocity

Reciprocal behavioral has been found to play a significant role in many economic domains, including labor supply, tax compliance, voting behavior, and fund-raising. What explains individuals’ tendency to respond to the kindness of others? Existing theories posit internal preferences for the welfare of others, inequality aversion, or utility from repaying others’ kindness. However,...

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English / 01/01/2014

Event-related theta synchronization predicts deficit in facial affect recognition in schizophrenia

Growing evidence suggests that abnormalities in the synchronized oscillatory activity of neurons in schizophrenia may lead to impaired neural activation and temporal coding and thus lead to neurocognitive dysfunctions, such as deficits in facial affect recognition. To gain an insight into the neurobiological processes linked to facial affect recognition, we investigated both induced...

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English / 01/01/2014

Shared and drug-specific effects of atomoxetine and methylphenidate on inhibitory brain dysfunction in medication-naive ADHD boys

The stimulant methylphenidate (MPX) and the nonstimulant atomoxetine (ATX) are the most commonly prescribed medications for attention deficit hyperactivity disorder (ADHD). However, no functional magnetic resonance imaging (fMRI) study has as yet investigated the effects of ATX on inhibitory or any other brain function in ADHD patients or compared its effects with those of MPX. A...

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English / 01/01/2014

Automatic detection of trustworthiness of the face: A visual mismatch negativity study

Recognizing intentions of strangers from facial cues is crucial in everyday social interactions. Recent studies demonstrated enhanced event-related potential (ERP) responses to untrustworthy compared to trustworthy faces. The aim of the present study was to investigate the electrophysiological correlates of automatic processing of trustworthiness cues in a visual oddball paradigm in...

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English / 01/01/2014

Inferring on the intentions of others by hierarchical bayesian learning

Inferring on others' (potentially time-varying) intentions is a fundamental problem during many social transactions. To investigate the underlying mechanisms, we applied computational modeling to behavioral data from an economic game in which 16 pairs of volunteers (randomly assigned to “player” or “adviser” roles) interacted. The player performed a probabilistic reinforcement...

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English / 01/01/2014

Cable regulation in the internet era

The market for multi-channel video programming has undergone considerable change in the last 15 years. Direct-Broadcast Satellite service, spurred by 1999 legislation that leveled the playing field with cable television systems, has grown from 3% to 33% of the U.S. MVPD (cable, satellite, and telco video) market. Telephone operators have entered in some parts of the US and online...

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English / 01/01/2014

Unternehmer mit Biss

Unternehmer braucht das Land, sagt der Ökonom Fabrizio Zilibotti: Sie sorgen
für Innovationen und wirtschaftliche Entwicklung. Zilibotti erforscht den Esprit
des Unternehmertums und wie dieser weitergegeben wird.

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Deutsch / 01/01/2014

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