A small series of consecutive, unmedicated male to female transsexuals were studied before hormonal treatment and prior to reassignment surgery. Quantitative EEG and LORETA source localization in the Eyes Open and Eyes Closed conditions were carried out, and they were compared to sinistral/ambilateral male and female controls, as the transsexual group was overwhelmingly sinistral. Discriminant function analysis and source localization showed that the transsexual group was similar to female heterosexual controls, with increased sources in the right hemisphere in the fast frequencies.
ZhouJNHofmanMAGoorenLJGSwaabDF. A sex difference in the human brain and its relation to transsexuality. Nature1995; 378: 68–70.
2.
KolesZJLindJCFlor-HenryP. A source-imaging (low resolution electromagnetic tomography) study of the EEGs from unmedicated men with schizophrenia. Psychiatry Res: Neuroimaging2004; 130: 171–190.
3.
Flor-HenryP. Differences in EEG organization in men and women. Lecture as part of Dr. Furedy's symposium “Psychophysiology of Sex Differences”, 11th World Congress of Psychophysiology, Montreal, Quebec, July 29-August 3, 2002. Int J Psychophysiology 45: 77.
4.
LandénMWålinderJLundströmB. Clinical characteristics of a total cohort of female and male applicants for sex reassignment: a descriptive study. Acta Psychiatrica Scandinavica1998; 97: 189–194.
5.
GreenRYoungR. Hand preference, sexual preference, and transsexualism. Arch Sex Behavior2001; 30(6): 565–574.
6.
OrlebekeJFBoomsmaDIGoorenLJGVerschoorAMvan den BreeMJM. Elevated sinistrality in transsexuals. Neuropsychology1992; 6(4): 351–355.
7.
AnnettM. A classification of hand preference by association analysis. Br J Psychology1970; 61: 303–321.
8.
Flor-HenryP. Sinistrality and psychopathology. In: CorenS, (ed). Left-handedness: Behavioral Implications and Anomalies. North Holland: Elsevier Science Publishers B.V.; 1990: 415–440.
9.
BlanchardRZuckerKJCohen-KettenisPTGoorenLJGBaileyJM. Birth order and sibling sex ratio in two samples of Dutch gender-dysphoric homosexual males. Arch Sex Behavior1996; 25(5): 495–514.
10.
GreenR. Birth order and ratio of brothers to sisters in transsexuals. Psychol Med2000; 30: 789–795.
11.
OhnoS. The role of H-Y antigen in primary sex determination. JAMA1978; 239(3): 217–220.
12.
SchneiderHJPickelJStallaGK. Typical female 2nd–4th finger length (2D:4D) ratios in male-to-female transsexuals: possible implications for prenatal androgen exposure. Psychoneuroendocrinology2006; 31: 265–269.
13.
PapageorgiouCPapageorgakiPTolisGRabavilasADChristodoulouGN. Psychophysiological correlates in male to female transsexuals studied with a P300 investigation. Psychol Med2003; 33: 555–561.
14.
Flor-HenryPLangRAKolesZJFrenzelRR. Quantitative EEG investigations of genital exhibitionism. Ann Sex Res1988; 1: 49–62.
15.
Flor-HenryPLangRAKolesZJFrenzelRR. Quantitative EEG studies of pedophilia. Int J Psychophysiology1991; 10: 253–258.
16.
Flor-HenryP. On the cerebral neurophysiology and neurotransmitter determination of sexual deviations. Int Rev Psychiatry1989; 1(2): 83–86.
