The cytological evidence has revealed a visible mechanical basis for the production of males and females in equal numbers and irrespective of external conditions (Wilson, 1909).

This cross-sectional study investigated toy-choice in 38 one-year-old, 33 three-year-old, and 35 five-year-old children, who could choose between 10 different toys (four feminine, four masculine, and two neutral) in a structured play-session. The children played alone for 7 minutes and together with their accompanying parent for another 7 minutes (play-status). The results showed that girls and...

The aim of the present study was to analyze whether task repetitions which are an inevitable part of repeated measures designs might induce performance alterations specific for gender and hemisphere. Male and female subjects conducted twice a lexical decision, a polygon recognition, and a face discrimination task as a visual half field paradigm with the two experimental sessions repeated by 2 w...

This study describes the characteristics of the Korean elderly. This study also investigates the population aging in conjunction with social and economic changes in Korea. Finally, this study explores social and economic implications with respect to the current and projected situation of the Korea elderly. Korean society has experienced very rapid changes both in demographic transition and popu...

Preclinical research is fundamental for the advancement of biomedical sciences and enhancing healthcare. Considering sex differences in all studies throughout the entire biomedical research pipeline is necessary to adequately inform clinical research and improve health outcomes. However, there is a paucity of information to date on sex differences in preclinical work. As of 2009, most (about 80...

The practice of sex selection for social reasons has raised serious criticism. Advocates of this practice, however, insist that objections to it are unfounded and that legal bans are ethically unjustified. Usually, proponents use a rights-based liberal approach as the framework to evaluate this practice. Under this framework, reproductive choice is a basic freedom and interference with individu...

We analyzed one decade of data collected by the Programme for International Student Assessment (PISA), including the mathematics and reading performance of nearly 1.5 million 15 year olds in 75 countries. Across nations, boys scored higher than girls in mathematics, but lower than girls in reading. The sex difference in reading was three times as large as in mathematics. There was considerable ...