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  1. #11
    RETIRED CzeCze's Avatar
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    I don't know about hereditary but I think people are pre-disposed to it. I was an extrovert by common definitions since I was a toddler, even before then. I do belief people are hard wired for pre-dispositions to introversion and extroversion. Life experience has probably made me more 'introverted' if anything.
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  2. #12
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    Quote Originally Posted by Mr. Sherlock Holmes View Post
    I only did genetics for one term in year 10, so please inform me. How do the recessive genes affect it and is it measurable and comparable to the situation? As far as I was aware there are no known genes that determine someone's introversion or extroversion, and that was sort of the purpose of the study.
    If there's no genetic connection then you want mother and father's types for socialization purposes?

    But yeah if you're taking genes into account, saying people are physically born one way or the other, then yes we have to take recessive genes into account, it wouldn't be as simple as mother and father.

  3. #13
    Klingon Warrior Princess Patches's Avatar
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    Sherlock, I feel like the problem with that poll is that as someone mentioned, Introversion-Extroversion is more of a spectrum than a black and white. For example, In my situation I have two extroverted parents that raised two introverted children. However, when you look at it from a 'spectrum' perspective - My mother is on the 'lesser' side of the extroversion spectrum, while my biological father is VERY extroverted. I feel like you have to account for that difference. Labeling them both as extroverts when they exhibit very different levels of extroversion doesn't work.

    Visual example: This is what my family would look like if ranked on a scale system. Which is why just labeling "I" and "E" would hardly be descriptive.
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  4. #14
    Consulting Detective Mr. Sherlock Holmes's Avatar
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    Yes, you're probably right there. It would be difficult to just have black and white extroversion. It'd probably have to be done to some degree of gradation if it was done.


    But I think I realise what you're saying now, marmalade.sunrise. We would have to know the genetics of our parents and add that into the equation rather than just saying whether they are introverted or extroverted? Yeah, that's a good point. I was simply thinking of the correlation of introversion and extroversion in comparison to parents in general, but that's probably going to vary based on all your genes and wouldn't reveal terribly accurate results on genetic predisposition. But genetics is so complicated and we can hardly expect people to list up their chromosone pairs along with that of their family or anything. That sort of thing would be an incredibly complex and difficult to achieve experiment, wouldn't it? Pfft... why am I even trying to propose an experiment to test any genetic aspect of personality. It's impossible! I'm gonna go study or something. I have a math exam in 2 days that I'm going to fail if I don't do something.
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  5. #15
    Senior Member NewEra's Avatar
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    This article should help: http://en.wikipedia.org/wiki/Extrave...ogical_factors

    Biological factors

    The relative importance of nature versus environment in determining the level of extraversion is controversial and the focus of many studies. Twin studies find a genetic component of 39% to 58%. In terms of the environmental component, the shared family environment appears to be far less important than individual environmental factors that are not shared between siblings.[13]

    Eysenck proposed that extraversion was caused by variability in cortical arousal. He hypothesized that introverts are characterized by higher levels of activity than extraverts and so are chronically more cortically aroused than extraverts. The fact that extraverts require more external stimulation than introverts has been interpreted as evidence for this hypothesis. Other evidence of the "stimulation" hypothesis is that introverts salivate more than extraverts in response to a drop of lemon juice.[14]

    Extraversion has been linked to higher sensitivity of the mesolimbic dopamine system to potentially rewarding stimuli.[15] This in part explains the high levels of positive affect found in extraverts, since they will more intensely feel the excitement of a potential reward. One consequence of this is that extraverts can more easily learn the contingencies for positive reinforcement, since the reward itself is experienced as greater.

    One study found that introverts have more blood flow in the frontal lobes of their brain and the anterior or frontal thalamus, which are areas dealing with internal processing, such as planning and problem solving. Extraverts have more blood flow in the anterior cingulate gyrus, temporal lobes, and posterior thalamus, which are involved in sensory and emotional experience.[16] This study and other research indicates that introversion-extraversion is related to individual differences in brain function.

    Also, in my experience, my parents are different (one extroverted, the other introverted) so it doesn't really help. As an introvert, when being exposed to extroverted situations too much (just being around various people too much), I get tired as hell.

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