Xenoglossy is the alleged speaking of a language that is entirely unknown to the individual. The person has never heard the language before but still can speak it fluently as if it were his/her native language. In other words, if a person speaks an unknown language that has not been acquired by natural means then it is known as xenoglossy.

There have been a number of well documented cases in which people have been found to have xenoglossy. So far, none of them have been proved to be accurate. Its not that those were cases of fraud, but there have not been enough evidences to completely prove them. Linguists and Psycholinguists say that until and unless they have enough evidences they cannot accept the existence of xenoglossy.

Language is a system of symbols with rules for combining them, used to communicate information. Language development is the result of a complex process involving several aspects of learning, many cognitive processes, and perhaps various genetically determined mechanisms as well. Thus, speaking a language that a person has never heard or is not all familiar with seems to be something that is not possible.

There are a number of different views about how language is acquired. According to the linguist Noam Chomsky, language acquisition is partly innate. This view suggests that human beings are born with a language acquisition device (LAD), which is a built-in neural system that provides them with an intuitive grasp of grammar of their native language. Chomsky says that humans are prepared to acquire language and that the language acquisition device allows children to deduce the structure of their native language by mere exposure to it.

Another view suggests that there is a critical period for language acquisition. Critical periods are time frames during which environmental exposure is required to stimulate an innate trait during early childhood. According to this view, children acquire language during this critical period. Studies show that a critical period exists, but it does not mean that adults cannot learn a language perfectly.

The social learning view of language acquisition suggests that language is acquired through a combination of learning and imitation. According to this view, children are praised and rewarded by their parents and elders for making sounds that are approximate to those of their native language. Also, parents very often model sounds, words, and sentences for their children. All these together contribute to the acquisition of language.

The Relational Frame theory based on the social learning view also suggests that language is acquired purely through the interaction with the environment. It gives emphasis to the importance of predicting and influencing psychological events, such as thoughts, feelings, and behaviours, by focusing on manipulable variables in their context. Studies supporting this view suggest that children learn language through a system of inherent reinforcements.

There are other views that suggest language acquisition is a cognitive process that emerges from the interaction of biological pressures and the environment. According to this both the environmental and biological aspects must work together in order to allow language acquisition. This view argues that general cognitive processes sub-serve language acquisition and that the end result of these processes is language-specific phenomena, like word learning and grammar acquisition.

Similar to this is Slobin’s view of language acquisition. According to him children posses certain information-processing abilities or strategies that they use in acquiring language. These are known as operating principles and seem to be present or to develop very early in life.

The last two views show that language acquisition is something that is a lot more complex than it is believed to be.

All these different views/theories of language acquisition suggest how language is acquired by children and thus may not be very apt for explaining something like xenoglossy. However, these theories also suggest that exposure to a certain language is very necessary to acquire it, which further weakens the claims of xenoglossy.

Researchers of xenoglossy say that the exhibition of the phenomenon of xenoglossy requires paranormal explanations and are beyond the usual psychological processes. So far, the explanations given for xenoglossy are reincarnation or being possessed by another soul. These explanations are themselves not very sound and are hard to believe. The phenomenon of reincarnation is a very popular area in parapsychology, but so far nothing has been proved. And being possessed by a soul sounds to be something that is quite preposterous despite its never ending claims by a number of people.

Researchers also suggest that xenoglossy might not even have an explanation. It is something like many of the other miracles that have happened throughout the existence of life. But, to accept something there has to be ample evidence for it, there has to be some kind of logic behind it, without which it may not be possible to accept the existence of xenoglossy.

However, there are many things in this world that are beyond logic and beyond any possible explanations. There are a number of paranormal and supernatural phenomena that have no explanation whatsoever. Some believe in them and some do not. Xenoglossy may also be one of those.

As mentioned above, there have been well-documented cases of xenoglossy. Most of them cannot be denied, irrespective of the explanations given for them not being good enough. All this makes it is very difficult to say that whether something like xenoglossy is possible or not.