View Poll Results: Are you a right-hander or a non-right hander?

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  • Right-hander

    16 64.00%
  • non Right-hander

    9 36.00%
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Thread: Handedness

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    Post Handedness

    Are you a right-hander or a non right-hander?

    The choices are somewhat different from the traditional "right-handed/left-handed" system of classification, although it ultimately proves too difficult to differentiate ambidexterity from left-handedness. Right handedness is defined as being right-hand dominant for all or virtually all activities by which the hands are necessary for (i.e. writing, throwing a projectile, etc). Left-handedness would include both distinct left-handers and those considered ambidexterous.

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    Post Re: Handedness

    Interesting results as of now.

    The right-hander:left-hander ratio in the population at large is approximately 9:1, although I would expect the ratio in this particular poll to be somewhat more balanced (because of the different criteria used).

    The causes of left-handedness are surprisingly poorly understand, although from current research, it appears the trait is largely prenatally determined with a considerable genetic component (note: this cannot apply to 'handedness' as a whole, rather simply left-handedness, as it does indeed seem humans are, for the most part, genetically "right-handed" by default. The estimates are in consideration of what factors are involved when the differing phenotype, left-handedness, is expressed). One specific study(Neale 1986) estimates the heritability of left-handedness at around 20%, with 7% attributable to common environmental effects, and the remaining variance influenced by unique environmental (prenatal) events.

    http://genepi.qimr.edu.au/staff/nick_pdf/CV346.pdf

    Also of relevance...

    "Lorin Elias, a psychology professor at the University of Saskatchewan, has a special interest in left-handedness, a characteristic that about ten percent of people exhibit and that often isn't clearly established until the age of six or seven. He agrees that the genetic component is significant, and quotes a meta-analysis (combining the results of many studies) done at St. Mary's Hospital Medical School in London, England in 1992. It found that two right-handed parents had a 9.5 percent chance of having a left-handed child; if one parent was left-handed, 19.5 percent of offspring would be left-handed; if both parents were lefties, 26.1 percent of their children would be, too."

    http://www.todaysparent.com/preschoo...sp?content=251

    "Approximately ten-percent of people are left-handed. If both parents are right-handed the chances for a lefty are two percent. If only one parent is right-handed, the chance of a lefty offspring increases to seventeen percent. If both parents are left-handed, it's about fifty-fifty. Also, twice a
    s many males as females are left-handed."


    http://www.wcax.com/Global/story.asp...2&nav=4QcVFCyV

    I recall reading about an interesting theory in Coren's book ("The Causes of Consequences of Left-Handedness") which offered an interesting explanation of the phenomena. Essentially, Coren postulates the 90% of the population is "genetically right-handed," with the remaining 10% "genetically left-handed." Coren estimates that 10% of each group will undergo a prenatal "switch" in brain hemisphere dominance in response to a combination of events in utero. Therefore, the resultant frequencies will be 82% and 18% of right and left handers respectively, with 1% of the right-handed "pathological" right-handers, and half the left-handers exhibiting the same "pathology".

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    Post Re: Handedness

    Interesting differences between Left and Right Handers

    Left handers are disproportionately male
    Left handers have a slower on average rate of maturation than right handers (even after sex is controlled for)
    Left handers have lower on average serum testosterone levels than right handers (at least, among males)
    Left handers have superior on average visuo-spatial skills than right handers(likely relates to testosterone, rate of maturation, or a combination of both factors)
    Left handers are overrepresented in fields such as architecture
    Left handers are overrepresented in sports such as tennis and baseball (particularly in the position of pitcher; likely relates to more developed spatial visualization skills)
    Left handers, as a group, have a higher IQ standard deviation than right handers (more geniuses and more learning disabled individuals)
    Left handers score slightly lower, on average, than right handers on tests of fluid intelligence (matrix relations, reasoning skills, pattern recognition etc)
    Left handers achieve slightly lower grades in school, on average, than right handers (overall difference in average was only 3%, although Coren notes that the disparity lnvolved higher marks for right handers in virtually every subject, and that it becomes more pronounced in later maturity and adulthood)
    Left handers tend to score high on the personality traits of introversion and neuroticism, and tend to afflicted moreso with disorders such as Schizophrenia when compared to right handers
    Left handers have a greater proclivity towards homosexuality and criminality
    Left handers tend to be more field dependent than right handers
    Autistic individuals are strongly inclined towards left-handedness or ambidexterity
    Left handers may be more "creative" than right handers, with a certain predisposition towards musical and artistic endeavours (may relate to dominance or activity of the right hemisphere)

    Most of the information is derived from the work of Stanley Coren, author of "The Causes and Consequences of Left handedness."

    If a specific source is required, however, I shall provide it.

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    Post Re: Handedness

    Came across an interesting site on lefthandedness.

    The following list of famous left-handed people is just one item to be found there:

    Norman Schwarzkopf
    Martina Navratilova
    Jimi Hendrix
    Charlie Chaplin
    Ted Williams
    Shoeless Joe Jackson
    Babe Ruth
    Sandy Koufax
    Steve Carlton
    Jimmy Connors
    John McEnroe
    Gerald Ford
    Earl Anthony
    Leonardo da Vinci
    Holbein
    Raphael
    Paul Klee
    Picasso
    Bob Dylan
    Ringo Starr
    Paul McCartney
    Harpo Marx
    Oprah Winfrey
    Goldie Hawn
    Jerry Seinfeld
    Bruce Boxleitner
    Harry Andersen
    Whoopi Goldberg
    Dennis Quaid
    Matt Dillon
    Andrew McCarthy
    Howie Mandel
    Diane Keaton
    Phil Collins
    Betty Grable
    Howard Keel
    June Allyson
    Bruce Willis
    Demi Moore
    Ryan O'Neil
    Richard Dreyfus
    Tom Cruise
    Natalie Cole
    All of the Manhattan Transfer
    George Michael
    Ron Perlman
    Mark Spitz
    Sandy Koufax
    Napoleon Bonaparte
    Julius Caesar
    Benjamin Franklin
    Albert Einstein
    Michaelangelo
    Pablo Picasso
    Jack the Ripper
    Billy the Kid
    Alexander the Great
    George II
    Queen Victoria
    Prince Charles
    James A. Garfield
    Harry Truman
    Nelson Rockefeller
    Carl Phillip Emanuel Bach
    W. C. Fields
    Dick Van Dyke
    Carol Brunett
    Cloris Leachman
    Danny Kaye
    Peter Fonda
    Paul Michael Glaser
    Michael Landon
    Robert Redford
    Judy Garland
    Marlyn Monroe
    Kim Novak
    Vida Blue
    Ty Cobb
    Whitey Ford
    Reggie Jackson
    Ron Guidry
    The Boston Strangler
    Stan Musial
    Bob Charles
    Sam Adams
    Ronald Reagan
    George Bush
    Bill Clinton
    Ross Perot
    Brad Pitt

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    Post Re: Handedness

    I am predominantly right handed, but have a tendency towards ambidexterity. My grandmother was a true ambidextrous individual. In myself, I write right handed, but can also write left. In Tennis I can use both hands and have a stronger backhand than forehand when using my right hand. When I was a gymnast, I was dominant left-handed, and always the only left dominant in my classes. I can't think of any other things off hand.
    "I do not know what horrified me most at that time: the economic misery of my companions, their moral and ethical coarseness, or the low level of their intellectual development." Adolf Hitler, Mein Kampf

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    Post Re: Handedness

    I should also add too other interesting points Coren made note of.

    Firstly, Blonds are more likely to be left-handed than those with hair of darker shades (within predominately White populations).

    Secondly, left-handers have a peculiar tendency to die younger than their right-handed counterparts (the overall difference is nine years; twelve for males).

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    Post Re: Handedness

    In those days there was a prejudice towards left handed people.
    There still is a prejudice in the sense that desks, notebooks, certain machinery and tools (drills, power saws, etc), as well as equipment in various sports (field hockey) are designed with the assumption that the individual using the device will be right-handed.

    A Chinaman once told me that "all Chinese are right handed". I pressed him on this and he came off of it a little saying all he had seen were right handed.
    There is a tremendous amount of cultural pressure within China that favours use of the right hand over the left. I recall reading that the incidence of left-handedness among Chinese diaspora is approximately ten times higher than the incidence among Hong Kong university students. I'll try to find the source.

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    Post Re: Handedness

    Males, Left-handers, and (mathematical) giftedness:
    http://www.findarticles.com/p/articl...v21/ai_4610401
    (see: "The Causes and Consequences of Left-handedness" by Stanley Coren for further information)

    Left-handers and Fluid intelligence:
    http://www.masson.it/cortex/pdf/vol3...e3/579-584.pdf

    Left-handers, Schizophrenia, Autism, and Homosexuality:
    http://www.narth.com/docs/lefthand.html
    (see: "The Causes and Consequences of Left-handedness" by Stanley Coren for further information)

    Left-handers and Field Dependence:
    http://www.childrenofmillennium.org/...ges/psych4.htm

    Left-handers and Serum testosterone levels:
    http://cogprints.ecs.soton.ac.uk/arc.../TANTANLAT.PDF.

    Left-handers and IQ standard deviation:
    (see: "The g Factor" by Arthur Jensen)

    All other information is derived from "The Causes and Consequences of Left-handedness" by Stanley Coren.

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    Post Re: Handedness

    Hands -> left
    Legs -> left
    Brain -> right
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