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| | Left-handed - Wikipedia, the free encyclopedia |
 | | Handedness must also be influenced by some of the other theories presented here. | | | Writing is not as good an indicator of handedness as it might seem, because many people who are left-handed write with their right hand and use their left for everything else. | | | One study conducted in 1998 by researchers at James McDevitt University, Oklahoma, revealed that when both parents are left-handed, there is only a 26% chance of their child being left-handed, an indication that genetics may not play the prominent role once thought in determining handedness. |
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http://en.wikipedia.org/wiki/Left-handed
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| | Handedness and Brain Lateralization |
| | Clarifying the relationship between handedness and functional brain specializations, and learning more about the developmental and neurobiological mechanisms that underlie these relationships, may help us better understand a wide range of seemingly unrelated issues such as dyslexia, stuttering, human variation, comparative brain research, developmental neurobiology of the brain, and the origins of human language. | | | This association between hand and brain captured the imaginations of researchers because it would be so useful (so easy, so non-invasive, so cheap) to study patterns of brain asymmetries by using a person's handedness as a marker for brain lateralization (direct methods involve neurosurgery, invasive drug testing, or expensive imaging techniques). | | | Researchers define handedness based on different theoretical assumptions. |
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http://www.indiana.edu/~primate/brain.html
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| | The Washington Monthly |
| | Handedness is one aspect of the overall concept of "laterality." In addition to hand preference, people exhibit foot preference and eye preference. | | | One theory is that handedness is determined by ontogenetic factors present in the womb, including, perhaps, the way that twins must lay in the womb. | | | In that regard, then, it is worth noting that handedness is not limited to humans, or even to mammals -- both my dogs are right handed -- but as you look at species whose evolutionary development lies further and further in the past, you are less and less likely to see handedness. |
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http://www.washingtonmonthly.com/archives/individual/2004_04/003664.php
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| | Gale Encyclopedia of Childhood and Adolescence: Handedness on LookSmart Junior High |
| | While the human mind is intuitively understood as a single entity, research in brain physiology and anatomy has demonstrated that various areas of the brain control different mental aptitudes, and that the physiological structure of the brain affects our mental functions. | | | Handedness research, however, uncovered a far more complex situation. | | | In essence, as advocates of left-handers have pointed out, it is not enough just to tolerate left-handedness: the right-handed world should become user-friendly for individuals exhibiting all the varieties of handedness. |
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http://www.gradewinner.com/p/articles/mi_g2602/is_0002/ai_2602000290
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| | On Left-Handedness, Its Causes and Costs |
| | "Handedness is a complex behavior," Dr. Geschwind said, "and no complex behavior has ever been shown to be due to only a single gene without any environmental influence." | | | It is hard to think of another behavioral difference so observable and so fundamental that has not been explained. | | | Many researchers around the world do not take the all-or-nothing stands of Dr. Klar and Dr. Coren but hold that both genetics and development are involved. |
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http://partners.nytimes.com/library/national/science/health/051600hth-genetics-lefthanded.html
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| | Chandler Burr - A Separate Creation - Excerpts |
| | Some researchers assert that handedness, thought to reflect one aspect of brain lateralization, may be a result of a cause--in some manner a concomitant--of schizophrenia's etiology or pathophysiology. | | | ("Handedness in twins with schizophrenia: was Boklage correct?" Schizophrenia Research 9, 83-85, 1993) conclude that there does not appear to be an association between handedness and schizophrenia. | | | Since both are internal orientations, the only way to identify them is by the respective behaviors that express them, motor reflex and sexual response. |
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http://www.chandlerburr.com/separate/excerpts/1
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| | What Is 'Handedness'? |
| | Because handedness is not just about hands, it's useful to talk more generally about laterality, which is the specialization of a particular side of the body to perform a particular task. | | | One way that researchers determine handedness (and foot, eye, and ear preference) is to ask questions like the ones at the beginning of this article. | | | The fact that these sorts of activities take up a lot of brainpower provides a clue about the relationship between handedness and the brain. |
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http://www.drspock.com/article/0,1510,5812,00.html
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| | Re: I was looking at your web page about genetic handedness. |
| | Therefore, handedness is probably more a result of an individual’s exposure to influences in their surroundings rather than an inherent biological property. | | | The biological basis for handedness is poorly understood, and a number of theories have been proposed. | | | While some animals do display preferences for hand usage on an individual level, there does not seem to be a consensus among primate specialists that any non-human species exhibits a similar species- level handedness found in humans. |
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http://www.madsci.org/posts/archives/oct99/941216015.Ge.r.html
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| | Handedness |
| | This show explores what handedness reveals about how the brain works. | | | Coren says such problems account for the high rates among left handers of immune system disorders ranging from allergies to thyroid disorders. | | | Coupled with the lateralization of language in the left hemisphere, says Dr. Geschwind, this suggests that there's some fundamental link between our development of handedness and language. |
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http://www.lcmedia.com/mind262.htm
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| | From Mouth to Hand: The Evolution of Right Handedness |
| | Further clarification of the extent and nature of handedness in the great apes will be critical to the hypothesis developed in this article. | | | Again, the incorporation of vocalization into gesture may have been responsible for the shift from a two-thirds to a 90-percent asymmetry, rather than for the creation of the asymmetry de novo. | | | One reason for supposing that differences in skill are secondary to a more fundamental preference for one or other hand is that children with childhood autism (McManus et al. |
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http://www.bbsonline.org/documents/a/00/00/22/71/bbs00002271-00/bbs.corballis.htm
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| | Yerkes researchers discover baisis for determining handedness in chimpanzees |
| | In a separate study, which is published in the same issue of Behavioral Neuroscience, Dr. Hopkins' team supported their findings about asymmetry by confirming that the brain structure of chimpanzees is similar to the brain structure of humans. | | | According to Bill Hopkins, PhD, research associate in the Division of Psychobiology at the Yerkes Research Center and the study's lead investigator, "The dominant scientific view has linked hand preference in humans with the area of the brain that controls language. | | | The researchers report their groundbreaking findings in the December 6 issue of Behavioral Neuroscience. |
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http://www.medicalnewstoday.com/medicalnews.php?newsid=17425&nfid=rssfeeds
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| | BBC - Science & Nature - Sex ID - Handedness |
| | Handedness may be a clue into our behaviour and the way our bodies work. | | | Our brains are contra lateral, meaning that the left hemisphere controls the movement of the right side of our body and the right hemisphere controls the left side of our body. | | | TV programmes The mind The body Brain Sex Sleep Photo competition |
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http://www.bbc.co.uk/science/humanbody/sex/articles/handedness.shtml
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| | handedness |
| | Hopkins, W.D., and Bennett, A.J. (1994) Handedness and approach-avoidance behavior in chimpanzees (Pan). | | | Yes, there is a correlation between handedness and body asymmetries. | | | Preferences in hand use are linked with asymmetries in brain organisation, so for example the part of the brain controlling the preferred hand generally has a larger volume than the corresponding region on the other side that controls the non-dominant hand. |
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http://www.nurseminerva.co.uk/handedne.htm
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| | Handedness and Cerebral Dominance: The Right Shift Theory -- Annett 10 (4): 459 -- Journal of Neuropsychiatry |
| | O'Callaghan MJ, Burn YR, Mohay HA, et al: Handedness in extremely low birth weight infants: aetiology and relationship to intellectual abilities, motor performance and behavior at four and six years. | | | Handedness and Cerebral Dominance: The Right Shift Theory -- Annett 10 (4): 459 -- Journal of Neuropsychiatry | | | Green MF: What is atypical about atypical handedness in schizophrenia? |
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http://neuro.psychiatryonline.org/cgi/content/full/10/4/459
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| | BBC NEWS Science/Nature Most walruses are right-flippered |
| | Handedness - preferring one side of the body to the other for certain tasks - has been found in chimps, monkeys and even crows, so it is perhaps not surprising that it should be found in an aquatic mammal. | | | The Danish, Swedish and Greenland researchers report their discovery in the online journal BMC Ecology. | | | Handedness has long been studied in the human population, but, after more than 150 years of research, scientists are still divided over why right-handers vastly outnumber left-handers. |
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http://news.bbc.co.uk/1/hi/sci/tech/3207912.stm
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| | The Hallowell Center - Is There Any Correlation Between Handedness and ADD? |
| | Having only recently fully understood these likely contributors to the confusing feelings when assessing my own worth, happiness and sense of belonging, it surely was nonetheless a comfort to know I was not a terribly-unique-defect and that there is hope for a better life. | | | Heres a link I found that talks about theories of left-handedness being linked to learning disorders such as ADHD. | | | Have any of you read any material or seen any studies that make a correlation between handedness and ADD? |
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http://www.drhallowell.com/dcforum/DCForumID2/302.html
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| | neurodiversity.com left-handedness |
| | The significance of the relationship between enuresis and handedness, in conjunction with a review of the literature, indicates that there is a possibility that both conditions may share at least one genetic origin. | | | So it's been natural to place positive value on the right hand or the right side of the body and negative value on the left and you can find that in in virtually all cultures and all languages if it comes to that. | | | In his day, Leonardo was known as a mancino ("lefty" and "southpaw" are modern-day equivalents), with all the social, cultural, and psychological connotations -- not all positive -- that the word implied in the Renaissance and does even into our own time |
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http://www.neurodiversity.com/lefthandedness.html
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| | Being Left-Handed: A Left-Handed Home Page |
| | Two interesting arguments: That left-handedness is not associated that closely with left-sidedness (and apparently only 57% of left-handers are also left-eyed); and stuttering and hand-switching may not be related at all (although the research can't disprove it, and Lorin seems to be of two minds about this one). | | | The original research on the origins of handedness is a particular highlight. | | | Carla MacInnis is looking for information linking handedness and mental illness. |
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http://www.emf.net/~estephen/facts/lefthand.html#scientific
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| | handedness |
| | Approximately 90% of humans are thought to be right-handed. | | | A cultural explanation is also challenged by the evidence that some other vertebrates demonstrate a preference for one hand or paw over the other. | | | handedness, habitual or more skillful use of one hand as opposed to the other. |
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http://www.infoplease.com/ce6/sci/A0822613.html
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| | Amazon.com: The Left-Hander Syndrome : The Causes & Consequences of Left Handedness: Books: Stanley Coren |
| | The current book explores the social consequences and biological causes of sinistrality in the process of explaining these findings, disproving some widely held myths along the way (e.g., most southpaws are not "right-brained"; handedness is probably not inherited). | | | SIPs: trait marker theory, birth stressors, own handedness, relationship between handedness, same handedness (more) | | | Gardner's The Ambidextrous Universe, and Annette's Left, Right Hand and Brain: The Right Shift Theory. |
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http://www.amazon.com/exec/obidos/tg/detail/-/0029066824?v=glance
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| | Handedness |
| | There was no significant relationship found between any portions of the reading sub-tests of the Iowa and handedness or eyedness. | | | Significantly better performance was found for right handed, right eyed individuals as well as unilateral dominant subjects on the VMI. | | | Speculations are given on the meaning and clinical implications of the findings. |
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http://www.oep.org/Maples13-4.htm
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| | Gay Orbit » “Handedness” in Drug Development™ |
| | Michael Demmons explains the concept of molecular handedness in drug development, and a recent breakthrough that makes it easier to control. | | | Did you know there is a concept of “handedness” in drug manufacturing? | | | I’m not a scientist by any means, but I’ve recently been researching a new drug I have been prescribed, and it was developed using a technique where one mirror-image molecule was stripped from the compound and the drug is left with the “left-hand&; side - the only side that is effective. |
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http://gayorbit.net/?p=3684
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| | Neuroscience for Kids - Sidedness |
| | For each subject, determine if all of the responses were on the right side, left side or mixed. | | | Observe which hand your subject uses to pick up a cup of water to drink. | | | For example, did your subject use his or her right hand for all the handedness tests? |
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http://staff.washington.edu/chudler/rightl.html
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| | Research into left-handedness and its effects |
| | Crow says that the gene responsible for encouraging specialist functions in one side of the brain, such as handedness, is what allows us to develop advanced skills, and without it the language centre of the brain would not have been able to develop. | | | Crow is aware these results may anger the parents of ambidextrous children, but he stresses that more research is needed to interpret the results fully. | | | "Most of the variation in intelligence is to do with the degree of handedness in the child." |
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http://www.anythingleft-handed.co.uk/lefty_research.html
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| | handedness |
| | Pretty soon, though, they overcome this as the muscles and ligaments come into balance. | | | I believe you can predict the handedness of your child very early on if you are observant. | | | Handedness is usually established by the third year of life. |
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http://www.drhull.com/EncyMaster/H/handedness.html
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| | New Scientist Premium- The secrets of human handedness - Features |
| | But while our "handedness" is one of the few things about ourselves we feel we can be sure of, the issue is anything but clear-cut, scientifically speaking. | | | In fact, despite an almost 200-year search for clear biological or psychological differences between left and right-handers, the one thing that most studies have in common is their inconclusiveness. | | | Chances are you know which camp you belong to, and the chances are also good that, like 90 per cent of the human population, you consider yourself to be right-handed. |
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http://www.newscientist.com/article.ns?id=mg18825241.900&feedId=health_rss20
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| | Handedness in Horses |
| | The problem with the horse may be less difficult since its handedness manifests through reflex chains, not requiring conscious thought. | | | And, indeed, like the horse that never learns to move well to the right, you may never be able to write legibly with the "wrong" hand. | | | Anyone is free to define it anyway one chooses, of course, and I choose to say that most horses are left-handed because most horses turn to the left, the near side, more readily than they do to the right, off, side. |
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http://www.horseshoes.com/farrierssites/sites/rooney/handedness/handedness.htm
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| | FindArticles search for "Handedness" |
| | Palm readers take note: A team of Canadian psychologists suggests that part of understanding sexual orientation may be close at hand. | | | Handedness and cerebral hemispheric differences were investigated with regard to the way pictorial information is stored in long-term memory. | | | Anatomy of handedness and the laterality of seizure onset: surgical implications of new understandings in motor control |
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http://www.findarticles.com/p/search?tb=art&qt=Handedness
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| | World of Handedness Are You Left-handed? |
| | The easiest way is to ask people about their hand preference in various specific "skilled" activities, which is much more objective. | | | You may notice that besides handedness, there are also tests for footedness, eyedness, and earedness. | | | People usually determine one's handedness by looking at which hand the person uses for writing, but in actuality this cannot always accurately reflect our true handedness - writing is only one of the many things that your hand can do! |
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http://jackie.freeshell.org/woh/tests.htm
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| | Behavior & Development > Handedness |
| | Well now you can learn more about what causes handedness and how it can affect your everyday life. | | | Or have you just plain taken being right-handed for granted? |
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http://www.drspock.com/topic/0,1504,643,00.html
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| | Gene Expression: left-handedness: 'feast or famine' mutation |
| | This seems to make sense insofar as it seems a bit of a stretch to blame brain damage on the left hemisphere for the elevated lefthandedness among groups like schizophrenics, autistics and dyslexics. | | | This article from the UK Times summarising some recent research on handedness was published last year but I thought it might still be worth bringing to GeneExpressors' attention so that it can be enriched with their unique insights. | | | To recap the state of knowledge, one theory which has tried to account for these patterns is that there are 2 kinds of left-handers - genetic left handers and 'pathological' left-handers (made at birth). |
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http://www.gnxp.com/MT2/archives/000191.html
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| | Handedness Research Institute C o p y r i g h t |
| | Holder, M.K. (2002). Parents' Guide to Handedness. Retrieved 17 September, 2002, from the Handedness Research Institute Web site: http://handedness.org/education/papers/parentsguide.pdf | | | (Handedness Research Institute, 2003) - or- ([last name of author/s], 2003) | | | For example, if you write an article, report, or review that uses information or concepts learned here, HRI should be referenced as the source. |
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http://handedness.org/copyright.html
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| | Hand Preference Questionnaire: Interim Report |
| | What areas of handedness research do you think are the most important? | | | Your feedback will help identify topics most relevant to public concerns, such as issues related to education, the workplace, public health and safety, product design, etc. | | | What Does Handedness Have to do with Brain Lateralization? |
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http://www.indiana.edu/~primate/forms/hand.html
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| | Breast Size, Handedness & Risk |
| | Data for 3918 cases and 11,712 controls from 7 centres were used to examine the association of handedness with laterality of breast cancer; data for 2325 cases and 7008 controls from 4 centres were used to assess the relation of bra cup size to breast cancer risk. | | | Bra cup size and handedness were studied as possible risk factors for breast cancer. | | | There was a suggestive (P about 0.10) association of handedness with breast cancer laterality: odds ratio of a left-handed (or ambidextrous) woman having a left-sided cancer 1.22 (95% CI 0.96-1.56). |
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http://www.annieappleseedproject.org/breassizhanr.html
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| | right-handedness |
| | handedness - handedness, habitual or more skillful use of one hand as opposed to the other. |
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http://www.infoplease.com/ce6/sci/A0918161.html
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| | BBC - h2g2 - Left Handedness - A625501 |
| | Handedness is the tendency to use one hand or the other to perform various everyday activities or tasks, such as writing. | | | Some people write with the hand they don't use for most other things, and some people have been forced to write with their 'wrong' hand. | | | Changing a person's handedness forces them to use a different brain hemisphere, and often causes stuttering or other learning difficulties. |
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http://www.bbc.co.uk/dna/h2g2/alabaster/A625501
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| | Birth Order and its Effect on Maturation Rates |
| | "The handedness of 942 subjects (305 tiertiary students, 591 of their siblings and 46 of their children) was ascertained by a 14-1tem questionaire. | | | The mothers of the subjects supplied information about maternal age at birth, birth wieght and the presence or absence of twelve conditions likely to be associated with birth stress for each subject. | | | The sample represented approximately 98 percent of all children of this age in a school system during 8 years. |
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http://www.neoteny.org/a/birthorder.html
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| | The Metropolitan Museum of Art - Special Exhibitions |
| | The difference in the level of documentation regarding Leonardo's handedness, one may argue, can largely be explained by the fact that, throughout his life, his manner of writing and drawing so conspicuously reflected his left-handedness that it could not fail to be striking to his contemporaries. | | | It is not likely, as has often been claimed, that de' Beatis made a mistake regarding Leonardo's handedness; he was probably a good observer of social behavior in his service as secretary. | | | It is normal for an artist to engage much of the body in the physical act of painting, and the most likely implication to be drawn from this observation is that Leonardo probably engaged his right arm and hand for balance and support in painting with his left. |
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http://www.metmuseum.org/special/Leonardo_Master_Draftsman/draftsman_left_essay.asp
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| | Breast Cancer, Handedness Could Be Linked |
| | Cuno Uiterwaal of the University Medical Center in the Netherlands and colleagues examined the relationship between handedness and breast cancer in 12,178 healthy, middle-age women from Utrecht participating in a breast cancer screening study. | | | A new study suggests that might be the case. | | | Between 1982 and 2000, the left-handed women in the study were more than twice as likely as right-handed women to develop breast cancer before going through menopause, the researchers found. |
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http://www.washingtonpost.com/wp-dyn/content/article/2005/09/25/AR2005092501152.html?nav=rss_print/asection
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| | Left handedness and raised breast cancer risk possible |
| | Left handedness may be linked to an increased risk of breast cancer, finds new research published online by the BMJ today (26 September 2005). | | | “Although the underlying mechanisms remain elusive, our results support the hypothesis that left handedness is related to increased risk of breast cancer,” they conclude. | | | Body measurements were taken and risk factors such as social and economic status, smoking habits, family history of breast cancer, and reproductive history were recorded. |
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http://www.medilexicon.com/medicalnews.php?newsid=31127
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| | Health Report - 02/02/1998: Left-handedness in the elderly |
| | This is what you would call a cross-sectional study, just taking one group and seeing that any one time what 15-year-olds were doing and what 70-year-olds are doing. | | | I ask them their occupation and their handedness because their handedness gives me a good clue about which side of the brain language is lateralised to. | | | There have been some retrospective studies where they've looked at people whose handedness was known at a particular time, and what happened to them; there's been a study looking at cricketers whose handedness is recorded in a cricket handbook, and then seeing at what age they die. |
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http://www.abc.net.au/rn/talks/8.30/helthrpt/stories/s10297.htm
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| | Handedness in children |
| | Children may choose handedness by three years, by the age of six, or not at all; all of which are normal. | | | She may or may not develop a preference in the next year or two. | | | Your niece's lack of handedness is completely normal. |
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http://www.ivillage.co.uk/pregnancyandbaby/toddler/todphys/qas/0,,43_159881-2,00.html
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| | Is There a Link Between Left-Handedness and Homosexuality? |
| | Lalumière, M.L.; Blanchard, R.; Zucker, K.L. (2000): "Sexual orientation and handedness in Men and Women: a meta-analysis." Psychological Bulletin 126, 575-592. | | | Nevertheless, the main routes to homosexuality would not likely be through the route that has caused some people to be left-handed. |
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http://www.narth.com/docs/lefthand.html
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