Left-Handed ‘n AmbiDexter”

Posted: June 21, 2009 in Uncategorized
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Tangan Kidal, Perlukah Diterapi?

Pernyataan diatas mungkin akan membuat sebagian orang tertawa karena sadar bahwa keadaan tersebut bukanlah suatu penyakit, ini pun belum tentu benar sepenuhnya, namun adalah suatu kenyataan juga bahwa sesekali waktu dokter pernah mendapatkan kasus ini di ruang praktek mereka.

Dimana pasien yang rata-rata adalah orangtua yang membawa anaknya menanyakan pada dokter tentang kemungkinan keadaan ini diterapi dengan alasan malu dan beberapa keterikatan adat serta etika, sementara mungkin sedikit sekali informasi yang dimiliki para dokter tentangkeadaan yang seringkali luput dari perhatian ini.

keadaan ini diterapi dengan alasan malu dan beberapa keterikatan adat serta etika, sementara mungkin sedikit sekali informasi yang dimiliki para dokter tentang keadaan yang seringkali luput dari perhatian ini.

Sekilas Tentang Tangan Kidal, Walau semua orang pasti mengetahui bahwa kidal berarti adalah kecenderungan menggunakan tangan kiri, namun dari teori kesehatan secara defenitif kidal atau lefthanded adalah suatu keadaan dimana dalam kehidupan sehari-hari yang
berhubungan dengan kegiatan anggota geraknya, selalu atau sering menggunakan tangan kirinya dan lebih merasanyaman dibandingkan dengan tangan kanannya.

Kidal juga terkadang dihubungkan para ahlinya bukan hanya pada tangan namun juga pada kaki, walaupun ini sedikit terdengar kurang lazim karena kaki, seringnya tidak memiliki spesifikasi kiri dan kanan dalam suatu aktifitas dari ringan hingga berat.

Namun beberapa riset yang ada menyebutkan bahwa hampir semua kasus tangan kidal juga diikuti oleh kecenderungan menggunakan sisi kaki yang sama, dan rata-rata semua keadaan ini didapat sejak lahir, walau belum terbukti seratus persen hubungannya dengan faktor genetik, serta ada juga yang muncul belakangan sebagai akibat dari beberapa hallain atau keinginan mempelajarinya sendiri atau kebiasaan, meski frekuensinya tergolong sangat kecil.

Orang bertangan kidal biasanya lebih banyak bahkan selalu cenderung menggunakan tangan kiri daripada kanan yang sudah menjadi suatu konsensus global dalam permasalahan etika untuk aktifitas fisik penting sehari-hari seperti makan, menulis, memegang sesuatu dan sebagainya.

Di luar anggapan pelanggaran etika dan pendapat kurang sopan sebenarnya keadaan ini bukanlah tergolong suatu cacat atau kelainan secara umum, dan tidak juga digolongkan
sebagai suatu penyakit walaupun mungkin ada kelainan mendasar yang terjadi dibalik keadaan ini.

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Kidal dan Cara Kerja Otak

Otak memiliki koordinasi pengaturan antara dua bagian tubuh kiri dan kanan, dan aktifitas ini bekerja secara silang dari sananya. Otak kanan akan mengatur bagian tubuh kiri manusia sedangkan otak kiri akan mengatur bagian tubuh kanan manusia.

Kecenderungan menggunakan tangan kiri pada keadaan kidal menurut banyak ahli berhubungan dengan cara kerja otak kanan, dengan penjelasan bahwa pada keadaan ini ada sedikit ketidakseimbangan dimana otak kanan lebih mendominasi aktifitas otak kiri, namun mereka juga menilai ketidakseimbangan ini bukanlah sebagai suatu gangguan, walaupun sebagian riset lain menyebutkan ada beberapa penyakit yang berhubungan dengan sistem otak danpersarafan yang bisa menimbulkan keadaan ini.

Penelitian yang pernah dilakukan tentang frekuensinya sendiri mencatat kurang lebih 12% penduduk dunia bertangan kidal dengan perbandingan usia dewasa antara 8-15%, sementara dari distribusi jenis kelamin ada pula penelitian yang menyebutkan bahwa keadaan ini lebih sering dijumpai pada laki-laki dibandingkan wanita tanpa adanya alasan mekanisme yang jelas, serta sebuah penelitian terpisah lagi yang menghubungkannya dengan kasus-kasus anak kembar.

Keadaan ini mereka temukan lebih tinggi frekuensinya pada kasus kembar identik serta kemungkinan kidal sebesar 76% pada anak yang memiliki saudara kembar kidal. Berkaitan dengan faktor penyakit neurologis dan sistem otak tadi sendiri, sebuah penelitian menyebutkan bahwa tangan kidal lebih sering didapatkan pada kelompok orang yang memiliki gangguan neurologis seperti epilepsi, down’s syndrome, autisme dan retardasi mental, namun penelitian ini bertolakbelakang dengan sejumlah penelitian lain yang menemukan kasus tangan kidal justru pada kelompok anak yang memiliki Intelligent Quotient (IQ) lebih tinggi. Dimana kelompok penelitinya juga menyinggung beberapa kalangan orang terkenal ber-IQ tinggi termasuk Hitler danbeberapa selebritis yang telah diperiksa tingkatan IQ-nya.

Hingga saat ini memang belum ditemukan penyebab jelasnya, namun disamping kasus ini juga ditemukan adanya kecenderungan atau lebih tepatnya kemampuan menggunakan
kedua tangan sekaligus kiri dan kanan dalam aktifitasnya.

Keadaan seperti ini dikenal kalangan ahlinya sebagai ambidexter dan tak seluruhnya didapat sejak lahir melainkan dapat dilatih sejak anak berusia 2 tahun keatas, malah sebagian juga melatihnya sejak usia dewasa dan berhasil.

Apakah Perlu Diterapi?
Keadaan kidal yang melalui serangkaian pemeriksaan tidak memiliki kelainan neurologis di luar keseimbangan pengaturan otak kiri dan kanan terhadap dua sisi tubuh tadi sebenarnya hingga sekarang tidak dianggap sebagai suatu penyakit, namun begitu, mungkin ada sejumlah aturan yang bisa diajarkan pada pemilik keadaan ini sebagai sisi adaptasi mereka.

Misalnya dalam hal bersalaman, menerima sesuatu ataupun makan, dalam aturan kalangan tertentu yang berhubungan dengan pandangan sopan-santun dalam adat-istiadat masyarakat. Sebuah riset menyebutkan bahwa sebagian kecil kasus kidal juga dibarengi rasa minder akibat lingkungan yang memaksa pemiliknya untuk sedapatnya menggunakan tangan kanan mereka, termasuk di sekolah dan di rumah.

Berkaitan dengan efek samping ini para ahli tersebut menganjurkan suatu sistem edukasi untuk tidak melakukan pemaksaan namun lebih berupa konseling terhadap protes-protes yang datang pada mereka, apalagi, sekarang sudah cukup banyak teknologi pendukung untuk pemilik tangan kidal.
(dr. Daniel Irawan)

Waspada Online
http://www.waspada.co.id

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Ambidexter

Ambidexter, orang yang ambidex biasanya adalah orang-orang kidal yang karena tekanan budaya terpaksa mengaktifkan kemampuan tangan kanan mereka. Banyak cabang olahraga yang memerlukan orang-orang ambidex. Billiard misalnya acap menempatkan pemain pada posisi sulit memukul menggunakan tangan kanan. Juga pada baseball, skateboard, dan cabang-cabang beladiri. Ambidexter tak memiliki hambatan pada kondisi seperti itu.
Seperti diketahui, orang saat lahir memiliki belahan otak kiri dan kanan yang sama besar dan sama berat. Kecenderungan penggunaan anggota tubuh sisi tertentu membuat salah satu belahan otak tumbuh menjadi lebih besar. Belahan otak bagian kiri dipergunakan untuk menyelesaikan tugas-tugas yang berkaitan dengan soal-soal eksakta sedang belahan kanan lebih kepada kemampuan bahasa. Dengan kata lain, orang yang lemah perihal mencongak bisa dipastikan lebih besar belahan otak kanannya.

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From Wikipedia, the free encyclopedia

Ambidexter

It is intended by this Latin word, to designate one who plays onboth sides; in a legal sense it is taken for a juror or embraceor who takesboth sides; in a legal sense it is taken for a juror or embraceor who takesmoney from the parties for giving his verdict. This is seldom or never donemoney from the parties for giving his verdict. This is seldom or never donein the United States.in the United States.]

Cross-dominance
From Wikipedia, the free encyclopedia

Cross-dominance, also known as mixed-handedness, mixed dominance, or hand-confusion, is a motor skill manifestation where a person favors one hand for some tasks and the other hand for others. For example, a cross-dominant person might write with the left hand but throw primarily with the right. Ambidexterity is a well-known but amazingly rare variant of cross-dominance, but cross-dominant people may also be left or right-handed rather than ambidextrous.
It can also refer to mixed laterality, which refers to a person favoring eyes, ears, feet, or hands on one side of the body. A person who is Cross-dominant can also be stronger on the opposite side of the body that they favor; for example, a right-handed person can be stronger on the left side. Cross-dominance can often be a problem when shooting or in activities that require aim, although athletes can still achieve success in sports that require accuracy, like passing in Gridiron and shooting in Basketball.

Famous cross-dominant people
• Leonardo da Vinci – Renaissance artist and scientist
• Albert Einstein – Scientist
• Richard Feynman – Scientist
• Oscar Wilde – Playwriter and poet
• Nikola Tesla – Inventor
• Michelangelo – Artist
• Benjamin Franklin – Scientist
• Mohandas Karamchand Gandhi – Religious and political leader
• Ludwig van Beethoven – composer
• Shawn Michaels – Professional wrestler
• LeBron James – Professional NBA basketball player
• Donovan McNabb American Football Player

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Ambidexterity is the state of being equally adept in the use of both right and left appendages (such as the hands). It is one of the most famous varieties of cross-dominance. People that are born ambidextrous are extremely rare. People that are made ambidextrous are called Penwald ambidextrous; they can also stop being both-handed.
Although ambidexterity is rare, ambidextrous people may still gravitate towards performing certain types of tasks with a specific hand. The degree of versatility with each hand is generally the qualitative factor in determining a person’s ambidexterity.

In modern times, it is more common to find people considered ambidextrous who were originally left handed, and who learned to be ambidextrous either deliberately or during childhood in institutions such as schools where right-handed habits are often emphasized. Also, since many everyday devices (such as can openers, scissors, guitars, or firearms) are asymmetrical and designed for right-handed people by default, many left-handed people learn to use them right-handedly due to lack or rarity of left-handed models. Thus, left-handed people are much more likely to develop motor skills in their non-dominant hand than right-handed people (who are not subjected to left-favoring devices). Ambidexterity is often encouraged in activities requiring a great deal of skill in both hands, such as juggling, swimming, percussion or keyboard music, word processing, surgery, body boxing, and combat[citation needed].

• Etymology
The word “ambidextrous” is derived from the Latin roots ambi, meaning “both,” and dexter, meaning “right” or favorable. Thus, “ambidextrous” is literally “right on both sides.” The term ambidexter in English was originally used in a legal sense of jurors who accepted bribes from both parties for their verdict. Jurors found guilty of such bribery had to forfeit decies tantum, ten times as much as they received.

In sports
Baseball
Ambidexterity is highly prized in the sport of baseball. “Switch hitting” is the most common phenomenon, and is highly prized because a batter usually has a higher statistical chance of successfully hitting the baseball when it is thrown by an opposite handed pitcher. Therefore, an ambidextrous hitter can bat from whichever side is most advantageous to him or her in that situation. Pete Rose, who had more hits than anyone else in the history of Major League Baseball, was a “switch hitter.”

Ambidextrous pitchers have also been known. Tony Mullane won 284 games in the 19th century, and also Elton Chamberlain in 1888 and Larry Corcoran in 1884. Greg A. Harris is the only major league pitcher in the modern era to pitch with both his left and his right arm. A natural right-hander, by 1986 he could throw well enough with his left hand that he felt capable of pitching with either hand in a game. Harris wasn’t allowed to throw left-handed in a regular-season game until September 28, 1995, the next-to-last game of his career. Against the Cincinnati Reds in the ninth inning, Harris (then a member of the Montreal Expos) retired Reggie Sanders pitching right-handed, then switched to his left hand for the next two hitters, Hal Morris and Ed Taubensee, who both batted left-handed. Harris walked Morris but got Taubensee to ground out. He then went back to his right hand to retire Bret Boone to end the inning. One Division I NCAA pitcher, Pat Venditte formerly of the Creighton Bluejays, now with the New York Yankees Staten Island Class A team, regularly pitches with both arms. Venditte won his first game as a professional on June 28th, striking out batters with both left and right-handed pitches. Venditte is consulting with ambidextrous guru Michael J. Lavery, the Co-Founder of Whole Brain Planet, Inc. in an effort to improve not only his power but his ball control from the mound. Lavery is also working with Chuck Mellick, a Tracy, California semi-pro pitcher to help him accomplish his goal to set a Guinness World Record to be the first person to pitch over 90 miles-an-hour accurately with both arms. Lavery is also working with High School pitcher Matthew Berish and little leaguer Nick Bohannan.

Billy Wagner was a natural right-handed pitcher in his youth, but after breaking his throwing arm twice, he taught himself how to use his left arm by throwing nothing but fastballs against a barn wall. He became a dominant left-handed relief pitcher, most known for his 100+ MPH fastball. In his 1999 season, Wagner captured the National League Relief Man of the Year Award as a Houston Astro.

Basketball
David Lee of the New York Knicks.In basketball the player may choose to make a pass or shot with the weaker hand.Michael Beasley, one of the top rookies in the NBA, is ambidextrous.

Snooker
In cue sports, a player can reach farther across the table if they are able to play with either hand, since the cue must either be placed on the left or the right side of the body. English snooker player Ronnie O’Sullivan is unique amongst the current ranks of top snooker professionals, in that he is able to play to world standard with his left hand. While he lacks power in his left arm, his ability to alternate hands allows him to take shots that would otherwise require awkward cueing. When he first displayed this ability in the 1996 World Championship against the Canadian player Alain Robidoux, Robidoux accused him of disrespect. O’Sullivan responded that he played better with his left hand than Robidoux could with his right. O’Sullivan was summoned to a disciplinary hearing in response to Robidoux’s formal complaint, where he had to prove that he could play to a high level with his left hand. He played three frames of snooker against former world championship runner-up Rex Williams, winning all three. The charge of bringing the game into disrepute was subsequently dropped.

Other sports
In combat sports the fighter may choose to face their opponent with either the left shoulder forward in a right-handed stance or the right shoulder forward in a left-handed stance, thus a degree of cross dominance is useful.
In football, being able to kick with both feet provides more options for both passing and scoring, as well as the ability to play up both wings. Therefore, players with the ability to use their weaker foot with proficiency are valuable in any team.
In skateboarding, a person is considered exceptionally talented if they can skate successfully with not only their dominant foot forward but also the less dominant. Hence the term “switch skating.” Dominant switch skateboarders include Eric Koston, Guy Mariano, Jereme Rodgers, Paul Rodriguez, and Bob Burnquist.
It is much the same situation in surfing. Surfers who ride equally well in either stance are said to be surfing “switch-foot.”
In American football, it is especially advantageous to be able to use both arms. Ambidextrous receivers can make one-handed catches with both hands, quarterbacks can roll out of the pocket and throw with either arm, confusing the defense, linemen can hold their shoulders square and produce an equal amount of power with both arms, and punters can handle a bad snap and roll out and punt with either leg, limiting the chance of a block.
Receivers and corners can play on both the strong and weak sides equally if they do not have a preference.
Other examples of ambidextrous sportsmen
In tennis, a player may be able to reach balls on the backhand side more easily if they’re able to use the weaker hand. Perfect examples of players who are ambidextrous include Luke Jensen.

Some players find cross-dominance advantageous in golf, especially if a left-handed player utilizes right-handed clubs. Having more precise coordination with the left hand is believed to allow better-controlled, and stronger drives.
In golf, Mac O’Grady was a touring pro who played right-handed, yet could play “scratch” (no handicap) golf left-handed. He lobbied the USGA for years to be certified as an amateur “lefty” and a pro “righty” to no avail.
In athletics, Jonathan Edwards, a now-retired British triple jumper who still holds the world record in that event, was known to be able to kick with either foot while he played rugby. He displayed unprecedented ambidexterity while jumping off either foot during his competitive jumps.

Hockey and ice hockey players may shoot from the left or right-side of the body, and ice hockey player Gordie Howe was one of few players capable of doing both.
Another ice hockey player, goaltender Bill Durnan, was nicknamed “Dr. Strangeglove” for his ability to catch the puck with both hands. This feat won him the Vezina Trophy, then for the National Hockey League’s goalie with the lowest goals-against average, six times out of only seven seasons. He had developed this ability playing for church-league teams in Toronto and Montreal, to make up for his poor lateral movement.
In figure skating, most skaters who are right-handed spin and jump to the left, and vice-versa for left-handed individuals. Olympic Champion figure skater John Curry notably performed his jumps in one direction (anti-clockwise) while spinning predominantly in the other. Very few skaters have such an ability to perform jumps and spins in both directions, and it is now considered a “difficult variation” in spins under the ISU Judging System to rotate in the non-dominant direction. Michelle Kwan used an opposite-rotating camel spin in some of her programs as a signature move. No point bonus exists for opposite direction jumps or bi-directional combination jumps, despite their being much harder to perfect.

Tools
With respect to tools, ambidextrous may be used to mean that the tool may be used equally well with either hand; an “ambidextrous knife” refers to the opening mechanism on a folding knife. It can also mean that the tool can be interchanged between left and right in some other way, such as an “ambidextrous headset,” which can be worn on either the left or right ear.  Such devices may not be formally achiral, but interchangeable between different modes.

02 Juni 2009..With Radith ‘n Biyan Tonite let’s talk about..”Left-Handed & Ambidexter”

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