Hemispheric Asymmetry for Language Processing and Lateral Preference in Simultaneous Interpreters

Alice Mado Proverbio, Roberta Adorni

.

DOI: 10.4236/psych.2011.21002                

Abstract

Neuroimaging studies showed that linguistic functions are less lateralized in polyglots than in monolinguals. However, there is not much agreement about the role of the two hemispheres in semantic and syntactic processing in bilinguals. In this study, 35 right-handed Italian speakers were shown 520 words and pseudo-words. The task consisted in detecting a given target letter by pressing a button with either the left or right hand. 19 simultaneous interpreters and 16 monolingual University students participated in the study. Interpreters performed the task in their native (L1) and second language (L2 = English); monolingual students only in L1. Response times to targets were recorded as a function of the hand used. RTs were faster to words than pseudo-words (word superiority effect). Results showed a significant right hand/LH advantage for the student group, and a complete lack of asymmetry for the interpreters both in L1 and L2. These data indicate a left-lateralization of linguistic functions in monolinguals and reduced lateralization in polyglots. The lack of lateralization in interpreters can be attributed either to their polyglottism, or to their prolonged practice of simultaneous interpreting strategies (e.g., dealing with two input channels; right ear/LH for listening to themselves interpret and left ear/RH for listening to the source language).

Keywords

Laterality, Hemispheric Asymmetry, Interpreters, Bilingualism, Brain

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Abutalebi, J., Miozzo, A., & Cappa, S. F. (2000). Do subcortical structures control language selection in bilinguals Evidence from pathological language mixing. Neurocase, 6, 101-106.
[2]	Aglioti, S., Beltramello, A., Girardi, F., & Fabbro, F. (1996). Neurolinguistic and follow-up study of an unusual pattern of recovery from bilingual subcortical aphasia. Brain, 119, 1551-1564. doi:10.1093/brain/119.5.1551
[3]	Aglioti, S., & Fabbro, F. (1993). Paradoxical selective recovery in a bilingual aphasic following subcortical lesions. Neuroreport, 4, 1359-1362. doi:10.1097/00001756-199309150-00019
[4]	Chernigovskaya, T. V., Balonov, L. J., & Deglin, V. L. (1983). Bilingualism and brain functional asymmetry. Brain and Language, 20, 195-216. doi:10.1016/0093-934X(83)90042-1
[5]	Cohen, L., & Dehaene, S. (2004). Specialization within the ventral stream: The case for the visual word form area. NeuroImage, 22, 466-476. doi:10.1016/j.neuroimage.2003.12.049
[6]	Cohen, L., Lehericy, S., Chochon, F., Lemer, C., Rivaud, S., & Dehaene, S. (2002). Language-specific tuning of visual cortex. Functional properties of the Visual Word Form Area, 125, 1054-1069. doi:10.1097/00001756-199712010-00030
[7]	Dehaene, S., Dupoux, E., Mehler, J., Cohen, L., Paulesu, E., Perani, D., et al. (1997). Anatomical variability in the cortical representation of first and second language. NeuroReport, 8, 3809-3815. doi:10.1097/00001756-199712010-00030
[8]	Fabbro, F., Gran, B., & Gran, L. (1991). Hemispheric specialization for semantic and syntactic components of language in simultaneous interpreters. Brain and Language, 41, 1-42. doi:10.1016/0093-934X(91)90108-D
[9]	Fabbro, F., Gran, L., Basso, G., & Bava, A. (1990). Cerebral lateralization in simultaneous interpretation. Brain and Language, 39, 69-89. doi:10.1016/0093-934X(90)90005-2
[10]	Flowers, D. L., Jones, K., Noble, K., VanMeter, J., Zeffiro, T. A., Wood, F. B., et al. (2004). Attention to single letters activates left extrastriate cortex. NeuroImage, 21, 829-839. doi:10.1016/j.neuroimage.2003.10.002
[11]	Gran, L., & Fabbro, F. (1989). Cerebral lateralization for syntactic and semantic components in L1 (Italian) and L2 (English) in interpreting students: Training implications for simultaneous interpretation. Paper presented at the Coming of age, Proceedings of the 30th Annual ATA Conference.
[12]	Green, A., Nicholson, N. S., Vaid, J., White, N., & Steiner, R. (1990). Hemispheric involvement in shadowing vs. interpretation: A time-sharing study of simultaneous interpreters with matched bilingual and monolingual controls. Brain and Language, 39, 107-133. doi:10.1016/0093-934X(90)90007-4
[13]	Hugdahl, K., & Davidson, R. J. (2003). Brain asymmetry II. MA, Cambridge: MIT Press.
[14]	Lambert, S. (1989). Simultaneous interpreters: One ear may be better than two. Canadian Association of Translation Studies, TTR, 2, 109- 116.
[15]	Oldfield, R. C. (1971). The assessment and analysis of handedness: The Edinburgh inventory. Neuropsychologia, 9, 97-113. doi:10.1016/0028-3932(71)90067-4
[16]	Paradis, M. (1989). Bilingual and polyglot aphasia. In F. Boller & J. Grafman (Eds.), Handbook of Neuropsychology, 2, 117-140.
[17]	Polk, T. A., Stallcup, M., Aguirre, G. K., Alsop, D. C., Esposito, M. D., Detre, J. A., et al. (2002). Neural specialization for letter recognition. Journal of Cognitive Neuroscience, 14, 145-159. doi:10.1162/089892902317236803
[18]	Proverbio, A. M., ?ok, B., & Zani, A. (2002). Electrophysiological measures of language processing in bilinguals. Journal of Cognitive Neuroscience, 14, 994-1017. doi:10.1162/089892902320474463
[19]	Proverbio, A. M., Leoni, G., & Zani, A. (2004). Language switching mechanisms in simultaneous interpreters: An ERP study. Neuropsychologia, 42, 1636-1656.
[20]	doi:10.1016/j.neuropsychologia.2004.04.013
[21]	Proverbio, A. M., Adorni, R., & Zani, A. (2007). The organization of multiple languages in polyglots: Interference or independence. Journal of Neurolinguistics, 20, 25-49. doi:10.1016/j.jneuroling.2006.01.003
[22]	Proverbio, A. M., Wiedemann, F., Adorni, R., Rossi, V., Del Zotto, M., & Zani, A. (2007). Dissociating object familiarity from linguistic properties in mirror word reading. Behavioral and Brain Functions, 3, 43. doi:10.1186/1744-9081-3-43
[23]	Proverbio, A. M., Zani, A., & Adorni, R. (2008). The left fusiform area is affected by written frequency of words. Neuropsychologia, 46, 2292-2299. doi:10.1016/j.neuropsychologia.2008.03.024
[24]	Proverbio, A. M., Adorni, R., & Zani, A. (2009). Inferring native language from early bio-electrical activity. Biological Psychology, 80, 52-63. doi:10.1016/j.biopsycho.2008.02.006
[25]	Rinne, J. O., Tommola, J., Laine, M., Krause, B. J., Schmidt, D., Kaasinen, V., et al. (2000). The translating brain: Cerebral activation patterns during simultaneous interpreting. Neuroscience Letters, 294, 85-88. doi:10.1016/S0304-3940(00)01540-8
[26]	Reicher, G. M. (1969). Perceptual recognition as a function of meaninfulness of stimulus material. Journal of Experimental Psychology, 81, 275-280. doi:10.1037/h0027768
[27]	Xue, G., Chen, C., Jin, Z., & Dong, Q. (2006). Cerebral asymmetry in the Fusiform areas predicted the efficiency of learning a new writing system. Journal of Cognitive Neuroscience, 18, 923-931. doi:10.1162/jocn.2006.18.6.923