̽��ֱ�� of Cambridge - Teresa Parodi

Opinion: Speaking in tongues: the many benefits of bilingualism

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We live in a world of great linguistic diversity. More than half of the world’s population grows up with more than one language. There are, on the other hand, language communities that are monolingual, typically some parts of the English-speaking world.

In this case, bilingualism or multilingualism can be seen as an extraordinary situation – a source of admiration and worry at the same time. But there are communities where bilingualism or multilingualism are the norm – for example in regions of Africa. A Cameroonian, for example, could speak Limbum and Sari, both indigenous languages, plus Ewondo, a lingua franca, plus English or French, the official languages, plus Camfranglais, a further lingua franca used between anglophone and francophone Cameroonians.

On a smaller scale, we all know families where bilingualism or multilingualism are the norm, because the parents speak different languages or because the family uses a language different from that of the community around them.

How difficult is it for a child to grow up in such an environment? And what are bilingual children capable of? Well, they are capable of quite a lot, even at a very young age. They can understand and produce expressions in more than one language, they know who to address in which language, they are able to switch very fast from one language to the other.

Noses for grammar

Clearly we are talking here of a range of different skills: social, linguistic and cognitive. Social skills are the most known: bilingual children are able to interact with speakers of (at least) two languages and thus have direct access to two different cultures.

But they also have linguistic skills, some very obvious, such as understanding and using words and expressions in different languages. A less obvious aspect is that bilingual children have a raised awareness for how language “works”. For example, bilinguals are better than monolinguals of the same age at pinpointing that the sentence “apples growed on trees” is bad, and “apples grow on noses” is fine, but doesn’t make sense.

Less known are the cognitive skills developed by bilinguals, an issue of great interest for research at the moment, as seen, for example, in work by Ellen Bialystok and colleagues. Probably due to the practice of switching languages, bilinguals are very good at taking different perspectives, dealing with conflicting cues and ignoring irrelevant information. This skill can be applied to domains other than language, making it an added value of bilingualism.

Is it worth it?

What if one of the languages is not a “useful” one because, for example, it does not have many speakers (for example, Cornish)? Is it worth exposing the child to it? ̽��ֱ��linguistic, social and cognitive advantages mentioned above hold, independently of the specific languages. Any combination of languages has the same effect.

A common worry is that trying to speak two (or more) languages could be too strenuous for the child. But there is no need for concern: learning to speak is more similar to learning to walk than it is to learning a school subject. Learning to speak is genetically programmed. ̽��ֱ��brain is certainly able to cope with more than one language, as research and experience shows.

There could be a practical problem, though, in providing enough exposure to the languages. ̽��ֱ��stress is then on the parents to ensure the opportunity to interact with speakers of the languages in question. Bilingualism is not genetic: having parents who speak different language does not guarantee a bilingual child.

Code-switching is cool

Another frequent worry is that of the child learning two half languages, short of the “proper” version of either of them. One may, for example, hear bilinguals – children and adults – using words or expressions from two or more of the languages in their linguistic repertoire in a single sentence or text, a phenomenon known as code-switching.

Often people assume that the main reason for doing this is a lack of sufficient proficiency in one of the languages, such that the speaker cannot continue in the language they started in. They also often assume that the choice of the words from one language or the other is random. Far from it. Code-switching is common among bilinguals and, contrary to popular belief, it follows grammatical rules.

Research has shown regular patterns in code-switching, influenced by the languages concerned, by community norms and by which language(s) people learn first or use more frequently. Very often, code-switchers are very highly proficient in the languages concerned. Code-switching also follows social rules: bilingual children only use it if they know the interlocutor knows the “other” language.

Additionally, if asked for clarification, they know if they have spoken too quietly or used the wrong language, and only switch in the latter case. Both bilingual children and adults have a range of reasons, including sociolinguistic reasons to code-switch. Code-switching can be cool!

All typically developing children will learn one language. To learn more than one they need the opportunity and the motivation. Growing up with more than one language is an asset well worth the investment.

Teresa Parodi, Lecturer of Theoretical and Applied Linguistics, ̽��ֱ�� of Cambridge

This article was originally published on ̽��ֱ��Conversation. Read the original article.

̽��ֱ��opinions expressed in this article are those of the individual author(s) and do not represent the views of the ̽��ֱ�� of Cambridge.

Dr Teresa Parodi (Department of Theoretical and Applied Linguistics) discusses the linguistic, social and cognitive advantages of speaking more than one language.

Emma Taylor

From Within a Book

̽��ֱ��text in this work is licensed under a Creative Commons Attribution 4.0 International License. For image use please see separate credits above.

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Finding malaria's weak spot

admin — Wed, 06 Feb 2013 09:06:33 +0000

After over a decade of research into malaria, biologists Dr Teresa Tiffert and Dr Virgilio Lew at the Department of Physiology, Development and Neuroscience found their efforts to observe a key stage of the infection cycle severely hindered by the limits of available technology. An innovative collaboration with physicist Dr Pietro Cicuta at the Cavendish Laboratory and bio-imaging specialist Professor Clemens Kaminski in the Department of Chemical Engineering and Biotechnology is now yielding new insights into this devastating disease.

Under attack

Malaria is caused by parasites transmitted to humans through the bites of infected mosquitoes. According to the World Malaria Report 2011, there were about 216 million cases of malaria causing an estimated 655,000 deaths in 2010. Tiffert and Lew established their malaria laboratory in Cambridge in 1999 to investigate the most deadly form of the parasite, Plasmodium falciparum. Becoming increasingly resistant to available drugs, this species in particular is a growing public health concern.

Their current focus is a mysterious step in the life cycle of P. falciparum occurring inside the infected human’s bloodstream. ̽��ֱ��parasites, at this stage called merozoites, attach to and enter red blood cells (RBCs) to develop and multiply. After two days, the new merozoites are released and infect neighbouring RBCs. Over several days, this process amplifies the number of parasitised RBCs and causes severe and potentially lethal symptoms in humans.

“A huge amount of research has been devoted to understanding the RBC penetration process,” said Tiffert. “ ̽��ֱ��focus of many vaccine efforts is the molecules on the surfaces of both parasite and red cell that are instrumental in recognition and penetration. Our collaboration with Clemens developed new imaging approaches to investigate what happens in the cells after invasion. But the pre-invasion stage, when a merozoite first contacts a cell targeted for invasion, remained a profound mystery. Our research indicates that this stage is absolutely critical in determining the proportion of cells that will be infected in an individual.”

For invasion to occur, the tip of the merozoite has to be aligned perpendicularly to the RBC membrane. Tiffert and Lew are focusing on how this alignment comes about, which has proved a formidable technical challenge. “ ̽��ֱ��merozoites are only in the bloodstream for less than two minutes, where they are vulnerable to attack by the host’s immune system, before entering a RBC. To investigate what is going on we need to record lots of pre-invasion and penetration sequences at high speed, using high magnification and variable focusing in three dimensions. And the real challenge is to have the microscope on the right settings and to be recording at exactly the time when an infected cell has burst and released merozoites – something that is impossible to predict,” said Tiffert.

Techniques used by previous investigators have produced few useful recordings of this process occurring in culture, but from these an astonishing picture is emerging. “ ̽��ֱ��contact of the merozoite with the RBC elicits vigorous shape changes in the cell, not seen in any other context,” said Lew. “It seems clear that this helps the merozoite orientate itself correctly for penetration, because all movement stops as soon as this happens. ̽��ֱ��parasite is somehow getting the RBC to help it invade.”

A collaborative approach

Cicuta, a ̽��ֱ�� Lecturer involved in the ̽��ֱ��’s Physics of Medicine Initiative – which is bringing together researchers working at the interface of physical sciences, life sciences and clinical sciences – met the trio by chance three years ago. He realised he could use his background in fundamental physics to pioneer a new approach to understanding malaria. “It’s been a gradual move for me to apply what I’ve learnt in physics to biology,” he said. “From the physics point of view, RBC membranes are a material. This material is very soft and undergoes deformations and fluctuations, and I was interested in understanding the mechanics involved during infection with malaria.”

Drawing on his expertise in the development of experimental techniques, Cicuta collaborated with Tiffert, Lew and Kaminski to pioneer a completely automated imaging system that pushes the boundaries of live cell imaging, enabling individual RBCs and merozoites to be observed throughout the process of infection. ̽��ֱ��research was funded by the Biotechnology and Biological Sciences Research Council and the Engineering and Physical Sciences Research Council.

“This microscope can not only run by itself for days, it can perform all the tasks that a human would otherwise be doing. It can refocus, it can find infected cells and zoom in, and when it detects a release of parasites it can change its imaging modality by going into a high frame-rate acquisition. And when the release has finished it can search around in the culture to find another cell to monitor automatically,” said Cicuta. “We also want to integrate a technique called an optical trap, which uses a laser beam to grab cells and move them around, so we can deliver the parasites to the cells ourselves and see how they invade.”

“So far, we’ve been able to gather over 50 videos of infections, which my PhD student Alex Crick has processed to show very clearly that the RBCs undergo large changes in shape when the merozoites touch them. We’ve also seen very strange shape changes just before the parasites come out of the cells, and we want to see whether this has a bearing on the parasites’ ability to infect subsequent cells.”

During the development of the microscope, the team discovered variability in the way the infected RBCs behave before they burst. “It’s important to know that there isn’t just one story. ̽��ֱ��only way to find this out is to look at many cells, which this system allows,” said Lew. “It’s a new level of data that allows us to get experimentally significant results, and better understand the diversity of the merozoites,” Cicuta added.

Used in conjunction with other tools such as fluorescent indicators and molecular biological tools, the new technology will allow Tiffert and Lew to test their hypotheses about the pre-invasion stage of the disease. They hope to determine the critical steps, which could provide clues as to how to stop an infection. “This microscope is an extraordinary new tool that has potential for use across a huge field of biological problems involving cellular interactions,” explained Lew.

“It may provide a route to designing effective antimalarial drugs, reducing invasive efficiency and decreasing mortality,” said Tiffert. “ ̽��ֱ��automation we have achieved with this microscope will also be very important for future testing of malaria drugs and vaccines,” added Cicuta.

A visionary initiative

“ ̽��ֱ��Physics of Medicine Initiative has been essential to our work,” said Cicuta. ̽��ֱ�� ̽��ֱ�� formally established the Initiative in December 2008 through the opening of a new purpose-built research facility adjacent to the Cavendish Laboratory, funded by the ̽��ֱ�� and ̽��ֱ��Wolfson Foundation. ̽��ֱ��goal is to break down traditional barriers that have tended to limit interactions between researchers in the physical and biomedical sciences.

“I met my collaborators through a Physics of Medicine symposium, and the new building is the only place in the ̽��ֱ�� where this type of research can be done,” added Cicuta. “It’s set up for safe handling of hazardous biological organisms like P. falciparum, and also has the facilities to design hardware for our advanced microscopes. This work is exciting because it’s interdisciplinary. By applying physics to the knowledge biologists have been developing for many years, we can make very fast progress.”

For more information, please contact Jacqueline Garget at the ̽��ֱ�� of Cambridge Office of External Affairs and Communications

A ground-breaking imaging system to track malarial infection of blood cells in real time has been created by a collaboration catalysed by the ̽��ֱ��’s Physics of Medicine Initiative.

Finding Malaria's Weak Spot

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