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    Home > Active Ingredient News > Endocrine System > Shenzhen University and other institutions have found that men with high male hormones are more stingy, selfish, and not generous enough

    Shenzhen University and other institutions have found that men with high male hormones are more stingy, selfish, and not generous enough

    • Last Update: 2021-09-12
    • Source: Internet
    • Author: User
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    Testosterone is a hormone that is secreted by the testes and adrenal glands in the male body


    Testosterone is a hormone that is secreted by the testes and adrenal glands in the male body


    dailymail

    dailymail March 23, 2021, a study published in the Proceedings of the National Academy of Sciences by Shenzhen University, Sichuan Normal University, Shanghai Sport University and other organizations has once again verified that testosterone can reduce human generosity .


    The temporal-parietal junction is the area where the temporal lobe and the parietal lobe meet in the middle of the brain.
    It is responsible for collecting information from the thalamus and limbic system, as well as the visual, auditory and somatosensory systems, and then processing it
    .

    The left and right temporal and parietal junctions are shown in red.
    Previous studies have shown that when TPJ is activated, people will be more generous .
    In addition, when transcranial magnetic stimulation disrupts TPJ activity, it can lead to more selfish choices .
    Based on the above findings, the authors wonder whether testosterone can reduce generosity by affecting the activity of TPJ .
    To test this idea, the researchers recruited 70 male volunteers between the ages of 18 and 25 .
    Before the experiment started, the researchers asked them to treat mothers, fathers, siblings, partners, children, grandparents, family members, relatives, best friends, circle members, colleagues, neighbors, acquaintances, and strangers according to their degree of closeness.
    Score ((1=very close, 20=not close, using a 20-point Likert scale) .
    Next, the participants were asked to write down the corresponding social distances as 1, 2, 3, 5, 10, 20 The relationship between the target person and the participant, and the contact information used to pay for money .
    In addition, people with a social distance of 50 and 100 (respectively referred to as pure acquaintances and complete strangers) were added to the experiment .
    Researchers will volunteer Divided into 2 groups, the researchers applied gel on their upper arms and shoulders .
    One of the gels contained 150 mg of testosterone; the other used a placebo .
    Then, all participants received a sum of money for follow-up Experiment .
    After applying the gel for 3 hours, each volunteer was asked to lie on the fMRI machine .
    Then the researchers selected one of the volunteers to rate and asked the volunteers to make decisions about money: 

     
     

     

     


     
    Choose to own it alone (a selfish option) or to keep a portion of the money for yourself and share a portion with the person mentioned by the researcher (a generous choice)
    .
    Participants must respond within 6 seconds
    .
    The results of the study showed that whether it was in the testosterone group or the placebo group, the participants paid roughly the same to those close to them, and the degree of generosity decreased with the increase in social distance .
    But compared with participants in the placebo group, those who were given testosterone were less generous to people who were not close to them .
     The degree of generosity is measured by the amount of money that participants are willing to give up to benefit the other party.
    Next, the researchers explored the neurological mechanism behind this phenomenon.
    They discovered the temporal-parietal junction (TPJ) of the testosterone group of participants.
    There is a difference between the activities of the group and the placebo group .
    TPJ determines the degree of generosity of the generous .
    In the experiment, among the people who made generous choices, there was a positive correlation between the degree of generosity and the activities of TPJ, and the activity of TPJ increased as the degree of generosity increased .
    Testosterone reduced the TPJ signal activity associated with generosity.
    Compared with the placebo participants, the TPJ signal activity of the testosterone group was weak .
    In addition, the researchers also found that testosterone also reduces the functional connection between TPJ and the insula or striatum .
    During the generous selection process, the placebo group had a stronger functional connection with the insula or striatum than the testosterone group .
    Striatum: Coordinates multiple aspects of cognition, including movement and action planning, decision-making, motivation, reinforcement and reward perception .
    Striatum (red) insula in the brain: 

      
     


     

     
      It is thought to be related to consciousness and plays a role in a variety of functions usually associated with the regulation of mood or body homeostasis
    .
    These include awareness compassion, empathy and so on
    .
    Insula In short, this study confirms that high levels of testosterone can lead to more selfish choices .
    Testosterone reduces the generosity of participants by disrupting the activity of the brain's temporal-parietal junction (TPJ) and the functional connection with the insula and striatum .
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