00:00    |    
Initial credits 
00:05    |    
Introduction
00:46    |    
Testosterone level measurement
03:00    |    
Effects of testosterone exposure
Relation with mathematical performance
Mother's androgen level
Genetical masculinization 
Other biological issues
Relation with sports and arts
Link with aversion to risk 
Behavioral conducts
Economics
Economic behavior
20:19    |    
First paper on digit ratio
Description of errors
First table: Part one
First table: Part two
New data
Final data set
33:16    |    
Second paper on digit ratio
Objective
Investigation execution
Session 1
Session 2
Sample results
Performed regressions
Regression results
Data calibration for real values 
Final results
48:09    |    
Work in progress
51:48    |    
Question and answer period
55:14    |    
Final credits



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Fetal Exposure to Testosterone and Cognitive Abilities

27 de octubre de 2012   | Vistas: 12 |  

The digit ratio is the ratio of the lengths of different digits or fingers typically measured from the bottom crease where the finger joins the hand to the tip of the finger. It has been suggested by some scientists that the ratio of two digits in particular, the 2nd (index finger) and 4th (ring finger), is affected by exposure to androgens e.g. testosterone while in the uterus and that this 2D:4D ratio can be considered a crude measure for prenatal androgen exposure, with lower 2D:4D ratios pointing to higher androgen exposure.
Source: Wikipedia/Digit_ratio

Pablo Brañas speaks about several research papers that discuss fetal exposure to testosterone (digit ratio) and its implications on various characteristics of human behavior, such as performance in math, sports and arts. He mentions works that link this topic to risk aversion thus determining certain conduct when making economic decisions, also noticing how ratios vary among different ethnic groups. He shares two papers carried out by him, along with fellow scholars. One shows a different approach to sampling for this type of investigation; and the other presents a hypothesis about the impact of testosterone exposure on altruism. After commenting on the results, he discusses the ongoing investigative work on second to fourth digit ratio (2D:4D), explaining the relation between certain questions and answers, depending on people's 2D:4D ratio.


Pablo Brañas is professor of behavioral economics at the Business School of Middlesex University; and at the Economic Science Institute…

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