Pheromones and cerebral electrical activity
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Pheromones and cerebral electrical activity Tatu K, Molo MT, Perozzo P, Castelli L, Vighetti S CE.R.NE., Fondazione Carlo Molo , Torino, Italy. AIM OF THIS STUDY.

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Pheromones and cerebral electrical activity

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Pheromones and cerebral electrical activity

Pheromones and cerebral electrical activity

Tatu K, Molo MT, Perozzo P, Castelli L, Vighetti S

CE.R.NE., Fondazione Carlo Molo, Torino, Italy


Pheromones and cerebral electrical activity

AIM OF THIS STUDY

To examine cerebral electrical activity during the nasal administration of male and female pheromones in transsexuals and eterosexuals, during erotic visual stimulation


Pheromones and cerebral electrical activity

The vomeronasal organ (VNO)


Pheromones and cerebral electrical activity

The vomeronasal organ: connection with the hypothalamus


Pheromones and cerebral electrical activity

Subjects:

6 heterosexual male

6 heterosexual female

6 male-to-female (MtF) transsexuals

VNO detected with an optical fibre probe

Cerebral electrical activity recording (EEG): Brain

Mapping technique

16 erotic pictures of naked people (8 man and 8

women) selected from the International Affective

Picture System (Lang, 1999) were presented to each

subject.


Pheromones and cerebral electrical activity

First session

MtF Estratetraenol/Androstadienone

Males Estratetraenol/placebo

Females Androstadienone/placebo

Second session

MtF the opposite

Males the opposite

Females the opposite


Pheromones and cerebral electrical activity

Results

A specific software transformed all the numerical values recorded by each electrode into a spectrum of colours, thus creating a brain map

Statistical analysis showed significant differences in the two following conditions:

1. in the MtF group when comparing the androstadienone with the estratetraenol condition

2. between the MtF and the heterosexual women during the androstadienone condition.


Pheromones and cerebral electrical activity

Procedure

MtF Androstadienone

Males the opposite

Females the opposite

MtF Estratetraenol

Males Estratetraenol/placebo

Females Androstadienone/placebo

Results

1) In the MtF subgroup comparing the Androstadienone to the Estratetraenol condition we found:

major decrease in alpha rhythm (p=0.015) major increase in beta rhythm (p=0.001) with androstadienone = cerebral arousal


Pheromones and cerebral electrical activity

MTF

AndrostadienoneVSEstratetraenol


Pheromones and cerebral electrical activity

Procedure

MtF Androstadienone

Males the opposite

Females the opposite

MtF Estratetraenol

Males Estratetraenol/placebo

FemalesAndrostadienone/placebo

Results

2) During the Androstadienone condition, comparing the MtF and the Female subgroups we found:

major decrease in alpha rhythm (p=0.045) major increase in beta rhythm (p=0.045) in the MtF subgroup = cerebral arousal


Pheromones and cerebral electrical activity

Androstadienone

MtF VS Heterosexual females


Pheromones and cerebral electrical activity

Procedure

MtF Androstadienone

Males the opposite

Females the opposite

MtF Estratetraenol

Males Estratetraenol/placebo

Females Androstadienone/placebo

  • Results

  • 3) No significant differences were found among the other conditions:

  • between the MtF and the heterosexual males in the estratetraenol condition

  •   between the estratetraenol condition and placebo in the heterosexual males

  • between the androstadienone condition and placebo in the heterosexual females


Pheromones and cerebral electrical activity

Conclusion

Our study highlights two important findings:

New evidence of biological differences between transsexuals and men

Transsexuals are more aroused than heterosexuals by erotic stimuli


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