Twins vs. "LD"(Language Development)

The article was explaining how their is an assumption that twins are somewhat delayed in language development and they are prone to language disabilities. In other words, twins are known to not catch on quicker than non-twins, who are also known as "Singletons."

The reason this assumption came about was because their were several studies done giving facts that twins are more prone to language delays and disorders because of biological and social factors. These studies also showed that twins are catching up with "singletons" on standarized language test during the childhood.

Day(1932) and Davis(1937),are two researchers who did two of the largest studies on the language of twins as a group. Both researchers used similar methods for each study and therefore came out with somewhat similar results. Day's study consisted of 80 pairs of twins and 140 singletons. The age range of the children were 1.5 to 5.5. Twenty pairs of those eighty twins were between the ages of 2,3,4,and 5 years of age. From this study, 50 utterances were recorded among the children while they were playing with toys that were giving to them by the experimenter. The end results were that among the different levels of language complexity,twins were seen to be at least 2 years behind the non-twins(singletons) by the age of five,whereas Davis, who used pairs of twins between the ages 5-9, found that on certain levels of structural measures, the twins caught up with the "singletons" on average, but will probably have problems with articulation. However, there were several things that the studies lacked, which would not make their information credible.

Among these two studies were some others which made this topic very controversial. Although throughout all of the studies, their results were somewhat correlating, their were still different ways of how each researcher came up with their results. At the end of all of the studies, all results were "on average." It was found that some reason for the child's disability was because of biological factors. However, these conditions are not just found among twins. It can also be found among non-twins (singletons) as well.

What do you think about twins and this language disability? Do you think their is a difference between twins and any other person with a language disability? Do you believe that others(non-twins/singletons) are more exempt from this language disability than twins?