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What Research Tells Us About Immersion

Today and next week, we will share a review of research into the benefits and challenges of language immersion programs by Tara Williams Fortune of the Center for Advanced Research on Language Acquisition.

by Tara Williams Fortune

Over nearly half a century, research on language immersion education has heralded benefits such as academic achievement, language and literacy development in two or more languages, and cognitive skills. This research also exposes some of the challenges that accompany the immersion model, with its multilayered agenda of language, literacy and intercultural skills development during subject matter learning.


Benefits of Language Immersion

Academic and Educational
Without question, the issue investigated most often in research on language immersion education is students' ability to perform academically on standardized tests administered in English. This question emerges again and again in direct response to stakeholder concerns that development of a language other than English may jeopardize basic schooling goals, high levels of oral and written communication skills in English, and grade-appropriate academic achievement. The research response to this question is longstanding and consistent: English-proficient immersion students are capable of achieving as well as, and in some cases better than, non-immersion peers on standardized measures of reading and math.

This finding applies to students from a range of socioeconomic and ethnic backgrounds, as well as diverse cognitive and linguistic abilities. Moreover, academic achievement on tests administered in English occurs regardless of the second language being learned. In other words, whether learning through alphabetic languages (Spanish, Hawaiian, French, etc.) or character-based languages (Mandarin, Japanese, Cantonese), English-proficient students will keep pace academically with peers in English-medium programs.

It is important to acknowledge that early studies carried out in one-way total immersion programs, where English may not be introduced until grades 2-5, show evidence of a temporary lag in specific English language skills such as spelling, capitalization, punctuation, word knowledge, and word discrimination. That said, these studies also find that within a year or two after instruction in English language arts begins, the lag disappears. There were no long-term negative repercussions to English language or literacy development.

Does this same finding apply to students in two-way immersion (TWI) settings whose first language is other than English? In the past fifteen to twenty years, U.S. researchers found that English learners' academic achievement also attained the programs' goals. By the upper elementary, or in some cases early secondary grades, English learners from different ethnicities, language backgrounds, socioeconomic levels, and developmental profiles perform at least as well as same background peers being schooled in English only. Most English learners in TWI come from Latino families whose home language is Spanish. As an ethnic minority in the United States, Latinos are both the fastest-growing student population and the group with the highest rate of school failure. Research in Spanish/English TWI contexts points to higher grade point averages and increased enrollment in post-secondary education for this student group, compared to Latino peers participating in other types of educational programs such as transitional bilingual education and various forms of English-medium education.

Although the vast majority of TWI research has been carried out in Spanish/English settings, Kathryn Lindholm-Leary recently reported results from a study of two Chinese/English TWI programs. Students in grades 4-8 whose home language was Chinese tested at or above their grade level, and the same as or well above peers with similar demographic profiles participating in non-TWI programs. Leary's findings align with those of other TWI programs.

Language and Literacy
The immersion approach first gained traction in North America because educators believed in its potential to move students further towards bilingualism and biliteracy. Immersion language programs took root in areas such as St. Lambert, Canada, and Miami, Florida, where educators felt that more than one language was necessary for children's future economic and social prosperity. Program designers wagered that making the second language the sole medium for teaching core subject content, instead of teaching the second language separately, would result in more students reaching higher levels of proficiency. These early immersion programs started by committing half or more of the school day for teachers and students to work only in the second language. Students were socialized to adopt the new language for all classroom communication and subject learning.
This approach to second-language and literacy development has proven itself to be the most successful school-based language program model available. English-proficient immersion students typically achieve higher levels of minority (non-English) language proficiency when compared with students in other types of language programs. Immersion students who begin the program as English speakers consistently develop native-like levels of comprehension, such as listening and reading skills, in their second language. They also display fluency and confidence when using it. Further, the more time spent learning through the non-English language, the higher the level of proficiency attained.

Initial concerns about the possible detriment to English language and literacy development were eventually laid to rest. English-proficient immersion students who achieved relatively high levels of second-language proficiency also acquired higher levels of English language skills and metalinguistic awareness—that is, the ability to think about how various parts of a language function. Researchers posit that metalinguistic skills positively impact learning to read in alphabetic languages, because they facilitate the development of critical literacy sub-skills such as phonological awareness and knowledge of letter-sound correspondences for word decoding. The important relationship between phonological awareness and successful reading abilities is clearly established. However, we now also have evidence that instructional time invested in developing important decoding sub-skills in an immersion student's second language can transfer and benefit decoding sub-skills in their first language.

Research about the relationship between character-based and English literacy sub-skills continues to grow. To date, evidence points to the transfer of phonological processing skills for children whose first language is Chinese and are learning to read in English as a second language. Studies also indicate a relationship between visual-orthographic skills in Chinese, the ability to visually distinguish basic orthographic patterns such as correct positioning of semantic radicals in compound characters, and English reading and spelling. Much remains to be learned in these areas, however, when it comes to English-proficient children in Mandarin immersion programs who are acquiring literacy in Chinese and English.

In TWI programs, research illuminates what Lindholm-Leary and E. R. Howard referred to as a "native-speaker effect." In a nutshell, the "native-speaker effect" describes the tendency of native speakers of a language to outperform second language learners of the same language on standardized measures administered in the native speakers' language. For example, if Spanish proficients and Spanish learners are evaluated using standardized Spanish-medium tools, Spanish proficients outperform Spanish learners. Similar outcomes occurred when tests were given in English and Mandarin.

In general, research finds that immersion students whose first language is not English become more balanced bilinguals and develop higher levels of bilingualism and biliteracy when compared with English-proficient students or home language peers participating in other educational programming. For example, Kim Potowski found that the oral and written language skills of English learners in TWI were only slightly behind those of recent Spanish-speaking arrivals and significantly better than their English-proficient peers. English learners' higher bilingual proficiency levels are also linked to higher levels of reading achievement in English, increased academic language proficiency, and successful schooling experiences in general.

Cognitive Skill Development
There's a well-established positive relationship between basic thinking skills and being a fully proficient bilingual who maintains regular use of both languages. Fully proficient bilinguals outperform monolinguals in the areas of divergent thinking, pattern recognition, and problem solving.

Bilingual children develop the ability to solve problems that contain conflicting or misleading cues at an earlier age, and they can decipher them more quickly than monolinguals. When doing so, they demonstrate an advantage with selective attention and greater executive or inhibitory control. Fully proficient bilingual children have also been found to exhibit enhanced sensitivity to verbal and non-verbal cues and to show greater attention to their listeners' needs relative to monolingual children. Further, bilingual students display greater facility in learning additional languages when compared with monolinguals.

While much evidence supports the benefits associated with full and active bilingualism, the relationship between language immersion education and long-term cognitive benefits is less well-understood. Some research does indicate greater cognitive flexibility and better nonverbal problem-solving abilities among English-proficient language immersion students.

Decades ago, Dr. Jim Cummins cautioned about the need for a certain threshold level of second language proficiency before cognitive skills might be positively impacted. Accordingly, children who develop "partial bilingualism" in a second language may or may not experience cognitive benefits. While some studies report positive cognitive effects for partial or emerging bilinguals, Dr. Ellen Bialystock concurs that it is bilingual children with a more balanced and competent mastery of both languages who will predictably exhibit the positive cognitive consequences of bilingualism.

Economic and Sociocultural
Increasingly, proficiency in a second language and intercultural competency skills open up employment possibilities. Many sectors require increasing involvement in the global economy, from international businesses and tourism to communications and the diplomatic corps. High-level, high-paying employment will demand competence in more than one language. In the United States, world language abilities are increasingly important to national security, economic competitiveness, delivery of health care, and law enforcement.

Beyond economics are the countless advantages that bi-and multilingual individuals enjoy by being able to communicate with a much wider range of people from many different linguistic and cultural backgrounds. Knowledge of other languages enriches travel experiences and allows people to experience other societies and cultures more meaningfully. Besides access to foreign media, literature, and the arts, bi- and multilingual people can simply connect and converse more freely. Becoming bilingual leads to new ways of conceptualizing yourself and others. It expands your worldview, so that you not only know more, you know differently.

What success have you seen in immersion programs?

To see the full publication, and all footnotes, please download the report. Come back on Monday for part two on the challenges of immersion programs.

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