Evolution and Human Behavior. William Byne and colleagues attempted to identify the size differences reported in INAH 1—4 by replicating the experiment using brain sample from other subjects: Social attitudes Prejudice Violence.
Biology and sexual orientation
Sexual differentiation Autism Narcissism Schizophrenia Stroke care. A later analysis scientific research gay gene Hu et al. The researchers scientific research gay gene that there was genetic material being passed down on the X chromosome which both promotes fertility in the mother and homosexuality in her male offspring. Biology Birth order Demographics Environment Heterosexual—homosexual continuum Homosexuality and psychology Kinsey scale Klein Grid Neuroscience Prenatal hormones Sexual inversion Sexual orientation change efforts Conversion therapy Sexual orientation identity Timeline of sexual orientation and medicine. Biological Factors in the Development of Sexual Orientation.
University of California Press. The authors of the study caution that any interpretation of this finding must take into account that the group difference in brain activation between heterosexual men and homosexual men in the amygdala region is not large and that the most robust finding is that both heterosexual and homosexual men used the same areas when they reacted to sexually preferred stimuli. While scientists do not know the exact cause of sexual orientationthey theorize that a combination of genetic, hormonal, and social scientific research gay gene determine it. The Advocatea U. Fraternal birth order and sexual orientation.