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Several studies have reported that heterosexual women's preferences for male faces vary with hormonal fluctuations over the menstrual cycle and that women tend to prefer more masculine faces during ovulation or when not using hormonal contraceptives. While this has been tested using observational data, we provide the first double-blind randomized controlled study testing if oral contraceptives red

Background: Motor fluctuations are routinely documented using the Parkinson's disease (PD) home diary. However, the validity of this diary when compared to clinical observers is limited. Objective: This study disassembled the effects of nonmotor symptoms (NMS) on inter-method agreement between the PD home motor diary and clinical observers (outside validity criterion). Methods: A prospective obser

Many studies report on the association between 2D:4D, a putative marker for prenatal testosterone exposure, and economic preferences. However, most of these studies have limited sample sizes and test multiple hypotheses (without preregistration). In this study we mainly replicate the common specifications found in the literature for the association between the 2D:4D ratio and risk taking, the will

We study gender differences in altruism in a large random sample of the Swedish population using a standard dictator game. Beside a baseline treatment we implement a priming treatment where participants are reminded of their gender, and two treatments with known male and female counterpart respectively. We find suggestive evidence that women are more altruistic than men only in the priming treatme

A growing body of correlational studies suggests that sex hormones such as those contained in, or affected by, oral contraceptives (OCs) may impact economic behavior. However, despite widespread use of OCs among women in Western countries, little is known about their potential behavioral effects. The present study investigates whether OCs causally influence economic preferences. We randomly alloca

Cooperation and competition are both essential elements of economic life. Here we explore how cooperativeness in a prisoner's dilemma correlates with competitiveness in a sample of 9–12 years old children in Colombia and Sweden. Using two different measures and four different tasks for competitiveness, we find no consistent relationship between cooperativeness and competitiveness. However, we find

We look at gender differences in competitiveness, risk preferences and altruism in a large sample of children and adolescents aged 7–16 in Armenia. Post-Soviet Armenia has few formal barriers to gender equality but is also characterized by a patrilineal kinship system and traditional gender roles. In contrast to research conducted in Western countries, we find that girls increase their performance

In this article we compare cooperation among Colombian and Swedish children aged 9–12. We illustrate the dynamics of the prisoner's dilemma in a new task that is easily understood by children and performed during a physical education class. We find no robust evidence of a difference in cooperation between Colombia and Sweden overall. However, Colombian girls cooperate less than Swedish girls. We a

We look at gender differences among adolescents in Sweden in preferences for competition, altruism and risk. For competitiveness, we explore two different tasks that differ in associated stereotypes. We find no gender difference in competitiveness when comparing performance under competition to that without competition. We further find that boys and girls are equally likely to self-select into com

We explore gender differences in preferences for competition and risk among children aged 9–12 in Colombia and Sweden, two countries differing in gender equality according to macro indices. We include four types of tasks that vary in gender stereotyping when looking at competitiveness: running, skipping rope, math and word search. We find that boys and girls are equally competitive in all tasks an

Recent studies find that women are less competitive than men. This gender difference in competitiveness has been suggested as one possible explanation for why men occupy the majority of top positions in many sectors. In this study we explore competitiveness in children, with the premise that both context and gendered stereotypes regarding the task at hand may influence competitive behavior. A rela

Recent literature in economics has highlighted that competition and symbolic awards can provide non-monetary incentives. In this paper, we report on a step contest that we carried out at a large Swedish workplace in order to test whether competition for symbolic awards can be used to promote physical exercise. Each individual was equipped with a pedometer and registered the number of steps daily d

Local democracy is theoretically based on political parties offering different policies across and within sub-national geographical units. However, local democracy is embedded within a multilevel party and institutional structure that may compromise this endeavour. This study develops three expectations of policy variation: within party variation in political positions across geographical units; d

Aims: To explore the association between soluble neuropilin-1 (sNRP-1) and depression in patients with newly diagnosed type 2 diabetes (T2D). Materials and Methods: Multicentre, cross-sectional study including adults with serologically confirmed newly diagnosed T2D. Included variables: sex, sNPR-1 (low sNRP-1 was defined as <226 ng/mL), psychometrically assessed depression and anxiety, antidepress

Given incumbent-led autocratization in Tunisia, the article investigates support to democracy among youth in historically marginalized regions and the likelihood they will prefer the authoritarian alternative. Putting forth a framework for micro-level assessment of the cognitive and interpretive dynamics generating loss of popular support to democratic transition, the research problematizes the re

Electric power grids have a limited capacity for safe and reliable transfer of power. Due to the ongoing large-scale expansion of variable renewable energy sources, such as wind and solar, there is a growing need for rapid gridcapacity increase.This thesis explores methods for improving and expanding grid capacity through control of converter-interfaced energy resources, including wind and solar pElectric power grids have a limited capacity for safe and reliable transfer of power. Due to the ongoing large-scale expansion of variable renewable energy sources, such as wind and solar, there is a growing need for rapid gridcapacity increase.This thesis explores methods for improving and expanding grid capacity through control of converter-interfaced energy resources, including wind and solar p