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Thread: Average IQ of nations

  1. #51
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    Quote Originally Posted by giuseppe rossi View Post
    There is a very strong correlation between brain size controlled for height and weight and the mean IQ.

    Just read the
    RACE DIFFERENCES IN INTELLIGENCE by Richard Lynn.
    I don't know if I'd call it a "high" correlation, but there does seem to be a correlation:

    Structural brain variation and general intelligence

    RJ Haier, RE Jung, RA Yeo, K Head, MT Alkire - NeuroImage, 2004-

    Follow the link on this google scholar page to the study:
    http://scholar.google.com/scholar?st...=0,33&as_vis=1

    "Total brain volume accounts for about 16% of the variance in general intelligence scores."

    Also, "total brain volume assessed by MRI in many studies has been shown to correlate about r = 0.40 with intelligence scores."

    Also see :
    http://www.sciencedirect.com/science...60289604001357


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    I know a lot of very intelligent people who just can't cope with this extravert society we have;
    they overanalyze what people might think about them and therefore block themselves in doing what they can.
    I think that's a shame, because introvert people (often, but certainly not always connected with high intelligence)
    are also important for everyone.

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    Quote Originally Posted by Angela
    Well, they also have the highest recorded IQ scores
    Not all East Asians have the highest recorded IQ scores - only the Chinese, the Japanese and the Koreans. Natives of Siberia and of Russia's Far East, natives of Kazakhstan and natives of Mongolia do not have as high IQs as the former three ethnic groups. Which confirms the point made by Harpending & Cochran about civilization causing selective pressures which increase IQ (greater access to females and thus greater reproductive success for intellectually more capable males is well-attested for example in historical studies on Chinese civilization).

    So what determined male reproductive success in Chinese and European civilizations during historical times was mostly intelligence.

    While in Sub-Saharan tribal societies probably physical strength and size of male reproductive organ :) were more important.

    Check also the data that I posted before:

    https://robertlindsay.wordpress.com/...iq-trainwreck/

    Mongolians

    Largest heads 1450 cc.+
    Variable IQ

    North Chinese* 105
    Mongolians 99.5
    Eskimos 91
    Amerindians** 87
    Siberians*** unknown

    Median 95.5

    *Manchuria
    **Alaskans
    ***Aboriginals

    Large heads 1400-1449 cc.
    Variable IQ

    NE Asians* 105
    Russians** 96
    Amerindians** 87

    Median 96

    *incl. S. Chinese
    **Uralics
    **Canada, Alaska, Mexico, Fuegians

    Medium-large heads 1350-1399 cc.
    Variable IQ

    Nor./Cent. Europeans 98
    Amerindians* 87
    Oceanians** 84.5
    Ugandans 73

    Median 86

    *Most Amerindians
    **Polynesia, Micronesia, Melanesia

    Smallest heads 1200-1249 cc.
    Variable IQ

    SE Asians 90
    Far South Indians* 81

    Median 85.5

    *Incl. Sri Lanka, Seychelles, Comoros
    As you can see small-brained South-East Asians have the same IQ as very large-brained Eskimos. Etc., etc.

    The biggest heads of all are in Northern Chinese (Manchurians), Eskimos, Alaskan natives, Siberians and Mongolians. The Northern Chinese IQ is 105, the Mongolian IQ is 100, the Eskimo IQ is 91, the Alaska native IQ is 87 and the Siberian native IQ is not known.

    Note that Amerindians in Canada, Alaska, Mexico (!) and Tierra Del Fuego have larger heads (1400-1449 cc.) than any Europeans, yet Europeans have higher IQ’s than any of these Amerindians, who have IQ’s of 87. In addition, Uralics and Northeast Asians also have very large heads. Northeast Asians have median IQ’s of 105, Uralics have IQ’s of 96 and Amerindians have IQ’s of 87.

    Amerindians in most of the US and in most of Latin America, Egyptians, Ugandans and Oceanians (Polynesians, Melanesians and Micronesians) have the same sized heads (1350-1399 cc.) as Northern and Central Europeans.

    Northern and Central Europeans have median IQ’s of 98, Amerindians are at 87, Oceanians have median IQ’s of 84.5, and Ugandans have IQ’s of 73.

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    Are you saying size sometimes does matter? Just in some organs, not all of them? :)

    Seriously, you don't have to convince me, Tomenable...I think the research in this whole field is very problematic. I don't think anyone has really figured it out. That's mostly what my posts were intended to show.

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    Richard Lynn did a lot of recalculations and conversions of raw data to lower the average mean IQ of Italy.

    I will post some stuff in the next days.

    In the meantime this is a good list of real measured mean IQs.

    http://www.getiq.net/charts.jsp


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    Quote Originally Posted by Sennevini View Post
    I know a lot of very intelligent people who just can't cope with this extravert society we have;
    they overanalyze what people might think about them and therefore block themselves in doing what they can.
    I think that's a shame, because introvert people (often, but certainly not always connected with high intelligence)
    are also important for everyone.
    This is very true Sennevini. A number of people that could be considered low IQ with whatever methods are used to determine this so called intelligence quota are extremely talented in some type of skill and also very humble people and of course very intelligent in their own ways with a huge contribution towards society in general. Of course many can be be introverts.

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    Quote Originally Posted by Tomenable View Post
    Basso et al. in their 1987 study gave for Italians 76 (sample size 138) - I wonder if there is a typo here [96 / 86 instead of 76?].

    Pace & Sprini in their 1998 study gave a mean national IQ for Italians as 90 (sample size 5370).

    Belacchi et al. in their 2008 study gave a mean national IQ for Italians as 95 (sample size 1378).

    =============================
    1. Belacchi et al. report that the mean IQ of children in the North have a mean British IQ of 103.6, and mean IQ of children in the south have a mean British IQ of 99.8, giving a 3.7 IQ point advantage for children in the north. These IQs are derived from the British 1982 standardization. Lynn recalculated the results and report that the mean IQ is 95.

    Source: Belacchi, C., Scalisi, T. G., Cannoni, E., & Cornoldi, C. (2008). CPM-ColouredProgressive Matrices Stanardizzazioni Italiana. Firenze: Giunti O.S.
    Organizzaazioni Speciali.

    2. Pace and Sprini (1998). This sample gives results of a standardization of the Cattell Culture Fair test (CCF Scale 2 A) in Sicily on a sample of 5370 18 year old school students. The mean score was 31. This is equivalent to an IQ of 103 on the American and British norms given in Cattell (1959, p. 25). Lynn recalculated the results and report that the mean IQ is 90.

    Source: Pace, F., & Sprini, G. (1998). A proposito della “fairness” del Culture Fair di
    Cattell. Bollettino di Psicologia Applicata, 227, 77−85.

    3. Prunetti, Fenu, Freschi, and Rota (1996). This sample scored at the 54th percentile of the British 1982 standardization sample=101.5 IQ. Lynn recalculated the results and report that the mean IQ is 99.

    Source: Prunetti, C. (1985). Dati normativi del test P.M. 47 Coloured su un campione
    di bambini italiani. Bolletino di Psicologia Applicata, 176, 27−35.

    4. Lynn blatantly ignored the last surveys on mean Italian IQ.

    "Despite the minor differences between the studies, our results demonstrate quite clearly that raw scores [on Raven's Coloured Progressive Matrices] of children from Sicily are not lower than those [of children from the North and Central-South] reported by Cornoldi et al. (2010). On the contrary, they are sometimes higher. This result could be related to the fact that the children in our group were tested in group sessions, while children in Italian standardization scores (Belacchi et al., 2008) were tested both in group and individual administration. Belacchi et al. (2008), indeed, found mean raw scores significantly higher in group sessions administration than in individual administration. Moreover, the children in our group were selected for other research purposes, and did not include children with socio-cultural disadvantage or other type of behavioral or cognitive problems. The more extensive sample reported by Cornoldi et al. (2010), on the contrary, was collected with the aim of building norms, and it likely includes a more diverse sample of children coming from different urban and suburban areas, and showing different socio-cultural levels."

    "Naglieri et al. (submitted for publication) studied the differences between the psychometric qualities of the CAS [Cognitive Assessment System] for the Italian and US standardization samples. Although the goal of that study was not to make regional comparisons, they did report that there were no significant differences (F(1, 806)=2.19, p=.11) between the average CAS-Italian Full Scale standard scores (set at a mean of 100 and standard deviation of 15) for students from the northern (M=100.5; SD=13.2), central (M=101.2; SD=11.9), and southern (M=103.1; SD=11.6) regions of Italy. The mean standard scores for the students in the north were only slightly lower than the mean for those in the south (effect size=.21). These results suggest that a test of intelligence that measures basic neuropsychological processes, and does not include academically laden verbal and quantitative tests, yields small differences between the regional groups. These findings also amplify the importance of measuring intelligence directly when comparing groups and argue against using reading, math and science test scores as "proxies for intelligence" (Lynn, 2010a)."

    Source:
    D'Amico et al. "Differences in achievement not in intelligence in the north and south of Italy: Comments on Lynn (2010a, 2010b)". Learning and Individual Differences, 2012.

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    1.6. Intelligence scores and Flynn effect

    Lynn (2010b) uses data from several studies on Raven's test (Pruneti, 1985; Pruneti, Fenu, Freschi, & Rota, 1996; Tesi & Young, 1962) and Cattell Culture Fair test (Buj, 1981; Pace & Sprini, 1998). None of the studies used the same age groups and none were aimed at comparing IQs across regions of Italy.

    Moreover, Lynn (2010b) did not consider the calculation of IQs made by the authors, but rather he recalculated the IQ scores in light of the well known and controversial (Colom, Lluis-Font & Andrés-Pueyo, 2005) Flynn effect (2007), described as a general increase of intelligence scores over the world in the last 50 years. So, for instance, an IQ of 99 collected in 1960, was increased by 4 points considering the Flynn effect = 4 of the Italian IQ in the years 1960-79.

    Such procedure is questionable, as also Hagan, Drogin, and Guilmette (2008) pointed out. Indeed, different studies demonstrated that the Flynn effect is concentrated in the lower half of the normal distribution or in undeveloped countries (Colom et al., 2005), whereas a possible stagnation of IQ scores in developed ones is currently under debate (Teasdale & Owen, 2005; 2008).

    Source: D'Amico et al. "Differences in achievement not in intelligence in the north and south of Italy: Comments on Lynn (2010a, 2010b)". Learning and Individual Differences, 2012.

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    1 members found this post helpful.
    Unfortunately, these rankings can only lead us to wrong conclusions. Because, they are not based on strictly scientific grounds. There are different sources, there is no consistent methodology, tests are different, mutually incomparable, samples are unsuitable, periods differ in decades, tests somewhere replace estimates etc. Results can be valid only if in one period within a reasonable time, according to same methodology, scientifically selected samples, with tests same for the all, with careful design that impact of education is zero, research conducts in all countries, and in countries with larger population, by regions. In fact, the size of regions should be similar, but it is not possible to achieve ideally and differences in size of the region may be acceptable.

    Also, IQ is not enough. There are different types of intelligence. Gardner gives nine types of intelligence:
    http://www.niu.edu/facdev/resources/...elligences.pdf

    ...
    In terms of the skull, its size may not be a reliable indicator of intelligence. The more important are brain's fissures and convolutions.

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    An incomplete list of manipulations/recalculations of the mean IQ of Italy by Richard Lynn can be found in "IQ differences between the north and south of Italy: A reply to Beraldo and Cornoldi, Belacchi, Giofre, Martini, and Tressoldi".

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    Northern Monkeys for the win! I have Northern English ancestry and my IQ is 125; my maternal grandfather was 100% English, with his paternal grandmother Susie Turner Whitman's family being recent emigrants from Ashton in Makerfield, Lancashire, and with an IQ of 136.

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