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The branch of psychology that studies how physical objects are perceived by subjects is known as psychophysics. A feature of the experimental design is that the experimenter presents objectively measurable objects that are imperfectly perceived by subjects. The responses are stochastic in that a subject might respond differently in otherwise identical situations. These stochastic choices can be compared to the objectively measurable properties. This Element offers a brief introduction to the topic, explains how psychophysics insights are already present in economics, and describes experimental techniques with the goal that they are useful in the design of economics experiments. Noise is a ubiquitous feature of experimental economics and there is a large strand of economics literature that carefully considers the noise. However, the authors view the psychophysics experimental techniques as uniquely suited to helping experimental economists uncover what is hiding in the noise.

Gene-culture co-evolution emphasizes the joint role of culture and genes for the emergence of altruistic and cooperative behaviors and behavioral genetics provides estimates of their relative importance. However, these approaches cannot assess which biological traits determine altruism or how. We analyze the association between altruism in adults and the exposure to prenatal sex hormones, using the second-to-fourth digit ratio. We find an inverted U-shaped relation for left and right hands, which is very consistent for men and less systematic for women. Subjects with both high and low digit ratios give less than individuals with intermediate digit ratios. We repeat the exercise with the same subjects seven months later and find a similar association, even though subjects' behavior differs the second time they play the game. We then construct proxies of the median digit ratio in the population (using more than 1000 different subjects), show that subjects' altruism decreases with the distance of their ratio to these proxies. These results provide direct evidence that prenatal events contribute to the variation of altruistic behavior and that the exposure to fetal hormones is one of the relevant biological factors. In addition, the findings suggest that there might be an optimal level of exposure to these hormones from social perspective. ; Financial support from the Spanish Ministry of Science and Innovation (ECO2010{17049; ECO2009-09120), the Government of Andalusia Project for Excellence in Research (P07.SEJ.02547), the Government of the Basque Country (IT-223–07) and Fundacion Ramon Areces (I+D-2011)is gratefully acknowledged.

A revised version: Brañas-Garza, P.; Meloso, D.; Miller, L. Interactive and moral reasoning: a comparative study of response time. Innocenzo Gasparini Institute for Economic Research (IGIER), 2013. (Working Paper; 440) ; In a series of recent papers, Ariel Rubinstein claims that the study of response time sheds light on the process of reasoning involved in classical economic decision problems. In particular, he considers that a distinction can be drawn between instinc- tive and cognitive reasoning. This paper complements and expands upon Rubinstein's study on time responses. We show that strategic risk is the key element in explaining differences in median response time in ultimatum behavior. ; Financial support from the Spanish Ministry of Science and Innovation (grants ECO2012-30626, CSD2010-00034, and ECO2010-17049), the Government of Andalusia Project for Excellence in Research (grant P07.SEJ.02547), the Fundación Ramón Areces R+D 2011, and the European Research Council (advanced grant BRSCDP-TEA).

The current study examines individuals who were raised in a certain religion and at some stage of their life left it. Currently, they define their religious affiliation as 'no religion'. A battery of explanatory variables (country-specific ones, personal attributes and marriage variables) was employed to test for the determinants of this decision. It was found that the tendency of individuals to leave their religion is strongly correlated with the degree of strictness of their country and with their spouse's religious characteristics. Moreover, personal socio-demographic features seem to be less relevant. -- Religion ; convert-out ; church attendance ; prayer ; parental religiosity ; Europe

This paper deals with pain anticipation experienced before medical procedures. our experimental results show that individuals with lower time discount factors are more prone to suffer pain in advance. We provide a framework to rationalize the connection between pain anticipation and impatience. in this set up, more impatient subjects, who only value very near events, mainly take into account the present negative effects of medical procedures (the costs), whereas more patient individuals have a net positive valuation of medical events, given that they are able to value both the cost incurred now and all the benefits to be accrued in the future. ; Este artículo trata de la anticipación del dolor experimentada antes de los procedimientos médicos. nuestros resultados experimentales muestran que los individuos con factor de descuento temporal más bajo son más proclives a sufrir dolor por adelantado. el artículo proporciona un marco en el que racionalizar la relación existente entre impaciencia y anticipación del dolor. en este marco, los sujetos más impacientes, que evalúan sólo los eventos muy próximos en el tiempo, focalizan su atención principalmente en los efectos negativos de los procedimientos médicos (sólo los costes), mientras que los individuos más pacientes tienen una valoración neta positiva de los actos médicos puesto que valoran tanto el coste en el que se incurre en el presente como los beneficios que se obtendrán en el futuro. ; Financial support from the Spanish Ministry of Science and Innovation (SEJ2007-62081 and ECO2009-09120 and CO2010-17049), the Government of Andalusia Project for Excellence in Research (P07.SEJ.02547), Gobierno Vasco-DEUI (IT-313-07) and the Women's Institute of Spain (2008.031).

ABSTRACTThis paper focuses on the friendship effect on donations in a dictator game. Our results indicate that the taste for altruism is substantially increased when friends play the role of recipients. Controlling for reciprocity there is still a significant friendship effect on donations.

This paper deals with pain anticipation experienced before medical procedures. Our experimental results show that individuals with lower discount factors are more prone to suffer pain in advance. We provide a framework to rationalize the connection between pain anticipation and impatience. In this set up, more impatient subjects, who only value very near events, take into account mainly the negative effects of medical procedures (just the costs) whereas more patient individuals have a net positive valuation of medical events (given that they value both the cost incurred now and all the benefits accrued in the future). ; Financial support from the Spanish Ministry of Science and Innovation (SEJ2007-62081 and ECO2009-09120), the Government of Andalusia Project for Excellence in Research (P07.SEJ.02547), Gobierno Vasco-DEUI (IT-313-07) and the Women's Institute of Spain (2008.031). (2008.031).

This paper provides an empirical demonstration of high stakes incentives in relation to religious practice. It shows that, when both positive (carrot) and negative (stick) incentives are available, the former are more effective than the latter. Specifically, it is shown that beliefs in heaven are much more relevant than beliefs in hell when estimating the production of religious commodities (church-attendance and praying equations).

The current study examines individuals who were raised in a certain religion and at some stage of their life left it. Currently, they define their religious affiliation as 'no religion'. A battery of explanatory variables (country-specific ones, personal attributes and marriage variables) was employed to test for the determinants of this decision. It was found that the tendency of individuals to leave their religion is strongly correlated with the degree of strictness of their country and with their spouse's religious characteristics. Moreover, personal socio-demographic features seem to be less relevant.