Twins are regularly reported to invent languages of their own, unintelligible to others. These languages are known as autonomous languages,
About 40% of twins, generally monozygotic or identical twins, will develop some form of autonomous language, using nicknames, gestures, abbreviations, or terminology that they only use with each other. While parents and siblings can often discern the meaning, the twins generally don't use the terms with others.
There is tons of variation in language scores among twins, but overall, research shows that twins do tend to fall behind in language a bit more than single-born children do. Male twins in particular are vulnerable, often falling about 6 months behind even female twins (Lewis & Thompson, 1992).
Twins are especially likely to maintain an invented language because they spend so much time together and are on the same developmental schedule. They imitate and reinforce each other's early inventions, weakening each other's incentive to learn the mother tongue.
Poto and Cabengo (names given, respectively, by Grace and Virginia Kennedy to themselves) are American identical twins who used an invented language until the age of about eight. Poto and Cabengo is also the name of a documentary film about the girls made by Jean-Pierre Gorin and released in 1980.
Therefore, children with a spacing of less than 12 months became known as Irish twins (also known as “Catholic twins” or “Dutch twins”).
Cryptophasia is thought to occur among almost 50% of twins (both identical and fraternal). Under heavier scrutiny, most cryptophasia is revealed to be toddlers' mispronunciation of their mother tongue – a phase that every child goes through.
They come from the same fertilized egg and share the same genetic blueprint. To a standard DNA test, they are indistinguishable. But any forensics expert will tell you that there is at least one surefire way to tell them apart: identical twins do not have matching fingerprints.
Cryptophasia is a phenomenon of a language developed by twins (identical or fraternal) that only the two children can understand. The word has its roots from the Greek crypto-, meaning secret, and -phasia, meaning speech.
June Gibbons (born 11 April 1963) and Jennifer Gibbons (11 April 1963 – 9 March 1993) were identical twins who grew up in Wales. They became known as "The Silent Twins", since they only communicated with each other.
On the whole, language development among twins has been found to be about 1.7 months behind single babies at 20-months-old and 3.1 months behind at 3 years of age. There's even a name for this phenomenon: The “twinning effect.”
Fraternal twins, which are not identical twins, are the most common type of twins.
Brain-imaging research has shown that during mental tasks, such as memorising numbers, the patterns of brain activity (which can be considered a physical correlate of thought) are more similar among identical twins than non-identical twins.
The DNA of monozygotic twins tends not to be 100% identical, and epigenetic and environmental differences further widen the gap between twin pairs. It's not nature or nurture; it's a complex interaction between our genes, our environment, and our epigenetic markers that shape who we are and what illnesses befall us.
For twins Amy and Katie were incredibly born 87 days apart. Maria went into labour four months early, giving birth to Amy – but Katie did not arrive until three months later. Their incredible births will now become a Guinness World Record for the “longest interval between the birth of twins”.
The twins of Laura Pupo and her husband, Jose Carlos Martins. Laia was born nine days later. Despite being born 90 days premature, both Ian and his sister are now healthy and did not suffer any lasting complications. "I'm surrounded by a medical family, and they saw it as a novelty," Laura said.
Such twins, known scientifically as 'MoMo', an abbreviation for monoamniotic-monochorionic, are some of the rarest types of twins, making up less than one percent of all births in the United States, noted the statement. It also stressed that such MoMo twin pregnancies have a high risk of fetal complications.
However, since only women ovulate, the connection is only valid on the mother's side of the family. While men can carry the gene and pass it on to their daughters, a family history of twins doesn't make them any more likely to have twins themselves.
It was concluded, among many other things, that identical twins are about 85 percent similar for IQ, whereas fraternal twins are about 60 percent similar. This would seem to indicate that half of the variation in intelligence is due to genes.
Identical (i.e., monozygotic, or MZ) twins share 100 percent of their genes, whereas fraternal (i.e., dizygotic, or DZ) twins generally share only 50 percent of their genes.
In 99.9% of cases boy/girl twins are non-identical. However, in some extremely rare cases resulting from a genetic mutation, identical twins from an egg and sperm which began as male (XY) can develop into a male / female pair.
Semi-identical twins are rare, and doctors say they've identified the second case ever | CNN. You've probably heard of identical and fraternal twins, but a report released this week says there's a third kind -- sesquizygous twins or "semi-identical." Researchers say they share anywhere from 50 to 100% of their genomes.
Generally, left-handedness is found in 10.6% of the overall population. Some studies have reported that left-handedness is more common in twins than in singletons, occurring in 21% of people who are twins.
The first wife (died ante 1770), of Feodor Vassilyev (b. 1707–c. 1782), a peasant from Shuya, Russia, gave birth to 16 sets of twins.
What is the likelihood of having more than one set of twins? If existing twins are identical the chance of having another set is the same as most women, about 1 in 250. If the twins are non- identical the chances of having twins again are much higher.