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Dopaminergic Modulation of the Trade-off Between Probability and Time in Economic Decision-Making 

Date: 06/2015 Author(s): Arrondo, G.; Aznárez-Sanado, M.; Fernández-Seara, M.A.; Goñi, J.; Loayza, F.R.; Salamon-Klobut, Ewa; Heukamp, Franz; Pastor, M.A. Document type: Article in Journal (refereed) Studies on animals and humans have demonstrated the importance of dopamine in modulating decision-making processes. In this work, we have tested dopaminergic modulation of economic decision-making and its neural correlates by administering either placebo or metoclopramide, a dopamine D2-receptor antagonist, to healthy subjects, during a functional ... More information

Probability and Time Trade-Off 

Date: 04/2012 Author(s): Baucells Alibés, Manel; Heukamp, Franz Document type: Article in Journal (refereed) Probability and time are integral dimensions of virtually any decision. To treat them together, we consider the prospect of receiving outcome x with a probability p at time t. We define risk and time distance, and show that if these two distances are traded off linearly, then preferences are characterized by three functions: a value function, a probability ... More information Read related article

Effects on Resting Cerebral Blood Flow and Functional Connectivity Induced by Metoclopramide: A Perfusion MRI Study in Healthy Volunteers 

Date: 08/2011 Author(s): Fernández-Seara, M.A.; Aznárez-Sanado, M.; Mengual, E.; Irigoyen, J.; Heukamp, Franz; Pastor, M.A. Document type: Article in Journal (refereed) To determine the effects of metoclopramide on brain function, cerebral perfusion changes after a single oral dose were assessed in healthy volunteers using magnetic resonance imaging (MRI) techniques. Arterial spin labelling (ASL) perfusion MRI was used to measure cerebral blood flow before and after metoclopramide. Blood haemodynamics in the vertebral ... More information

The Neural Substrate and Functional Integration of Uncertainty in Decision Making: An Information Theory Approach 

Date: 03/2011 Author(s): Goñi, J.; Aznárez-Sanado, M.; Arrondo, G.; Fernández-Seara, M.; Loayza, F.R.; Heukamp, Franz; et al. Document type: Article in Journal (refereed) Decision making can be regarded as the outcome of cognitive processes leading to the selection of a course of action among several alternatives. Borrowing a central measurement from information theory, Shannon entropy, we quantified the uncertainties produced by decisions of participants within an economic decision task under different configurations ... More information

Does Country Matter for Subjective Well-Being? 

Date: 01/2011 Author(s): Heukamp, Franz; Ariño, Miguel Angel Document type: Article in Journal (refereed) It is known that characteristics of individuals explain only a part of the variations in Subjective Well-Being (SWB) between people. The country of origin of an individual accounts for a significant part of these differences. We study what drives the variations in SWB between countries after taking individual characteristics into account. We base our ... More information Read related article

Introduction to the Special Issue 

Date: 02/2010 Author(s): Baucells Alibés, Manel; Bosch-Domènech, A.; Heukamp, Franz Document type: Article in Journal (refereed) More information

Common Ratio Using Delay 

Date: 02/2010 Author(s): Baucells Alibés, Manel; Heukamp, Franz Document type: Article in Journal (refereed) We present an experiment in which in a choice between two risky prospects a common delay is added. The results show the same change in preferences as in the well-documented common ratio effect in risky lotteries. The added common delay acts as if the probabilities were divided by some common ratio. The experiment confirms prior evidence in the literature ... More information

Do Business Angels Alter the Risk-Return Equation in Early Stage Investments? 

Date: 06/2007 Author(s): Heukamp, Franz; Liechtenstein, Heinrich; Wakeling, N. Document type: Article in Journal (refereed) Venture capitalists in the German-speaking countries do not value the contribution of business angels in co-invested deals. Business angels do not reduce the risk perceived by venture capitalists in early stage deals even if the business angels have what venture capitalists regard as an ideal profile. Venture capitalists also refute that deals with ... More information

Stochastic Dominance and Cumulative Prospect Theory 

Date: 09/2006 Author(s): Baucells Alibés, Manel; Heukamp, Franz Document type: Article in Journal (refereed) We generalize and extend the second-order stochastic dominance condition for expected utility to cumulative prospect theory. The new definitions include preferences represented by S-shaped value functions, inverse S-shaped probability weighting functions, and loss aversion. The stochastic dominance conditions supply a framework to test different features ... More information

Does calcium leaching increase ductility of cementitious material? Evidence from direct tensile test 

Date: 06/2005 Author(s): Heukamp, Franz; Ulm, F.J.; Germaine, J.T. Document type: Article in Journal (refereed) There is an ongoing debate in the chemomechanics community over whether calcium leaching leads to an increase in brittleness or ductility of cementitious materials. While other research teams have addressed this question by size-effect studies of the fracture process of partially degraded mortar beams, we address this question, in this paper, through ... More information
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