Language Experience and Right Hemisphere Tasks: The Effects of Scanning Habits and Multilingualism

This study explores the effects of multilingualism and reading scanning habits on right hemisphere (RH) abilities. Native Hebrew speakers and Arabic-Hebrew bilinguals performed three tasks. Experiment 1 employed an odd/even decision paradigm on lateralized displays of bar graphs. Both groups of subjects displayed the expected LVFA within the range previously reported for readers of English. Experiment 2 consisted of a chair identification task designed to tap asymmetry of hemispheric arousal and a chimeric face task designed to tap RH specialization for facial emotion. Neither scanning habits nor language experience affected performance on the chair task. Scanning habits seem to have affected performance on the chimeric faces task: there was no preference for the left smile in these right-to-left readers, as opposed to previous results in the literature using left-to-right readers. Correlations between measures from the three tasks and all the subject's scores on an English proficiency test and on a Hebrew test for the bilinguals reveal tentative relationships between proficiency in a second language and RH abilities. The results do not support the hypothesis that multilingualism can affect the manner in which these nonlanguage tasks are subserved by the RH. They do support the hypothesis that scanning habits particular to specific languages can affect performance asymmetries on some nonlanguage tasks that have been posited to reflect RH specialization.

[1]  Jerre Levy,et al.  Perceptual asymmetries for free viewing of several types of chimeric stimuli , 1991, Brain and Cognition.

[2]  Jyotsna Vaid.  Asymmetries in tachistoscopic word recognition: scanning effects re-examined. , 1988, The International journal of neuroscience.

[3]  S. Levine,et al.  Are variations among subjects in lateral asymmetry real individual differences or random error in measurement?: Putting variability in its place , 1990, Brain and Cognition.

[4]  E. Zaidel,et al.  Individual differences in lateralization: effects of gender and handedness. , 1997, Neuropsychology.

[5]  D. Sewell,et al.  Visual Field asymmetries for verbal and dot localization tasks in monolingual and bilingual subjects , 1983, Brain and Language.

[6]  Stephen D. Christman,et al.  Equivalent perceptual asymmetries for free viewing of positive and negative emotional expressions in chimeric faces , 1993, Neuropsychologia.

[7]  D. Boles.  What bilateral displays do , 1990, Brain and Cognition.

[8]  D. Boles,et al.  Factor analysis and the cerebral hemispheres: Temporal, occipital and frontal functions , 1992, Neuropsychologia.

[9]  U Bellugi,et al.  Brain organization for language: clues from sign aphasia. , 1983, Human neurobiology.

[10]  J. Mattingley,et al.  Can task specific perceptual bias be distinguished from unilateral neglect? , 1994, Neuropsychologia.

[11]  M. Bryden,et al.  Cued dichotic listening with right-handed, left-handed, bilingual and learning-disabled children , 1988, Neuropsychologia.

[12]  S. Levander,et al.  Differences in asymmetric perception of facial expression in Free-Vision Chimeric stimuli and reaction time , 1990, Brain and Cognition.

[13]  M. Banich,et al.  Variations in patterns of lateral asymmetry among dextrals , 1984, Brain and Cognition.

[14]  E. Warrington,et al.  Cognitive Neuropsychology: A Clinical Introduction , 1990 .

[15]  J. Hellige,et al.  Multitask investigation of individual differences in hemispheric asymmetry. , 1988, Journal of experimental psychology. Human perception and performance.

[16]  D. Boles.  Do visual field asymmetries intercorrelate? , 1989, Neuropsychologia.

[17]  W. Heron,et al.  Perception as a function of retinal locus and attention. , 1957, The American journal of psychology.

[18]  Jyotsna Vaid,et al.  Language Processing in Bilinguals: Psycholinguistic and Neuropsychological Perspectives , 1989 .

[19]  W. Lambert,et al.  Multiple Language Experience and the Development of Cerebral Dominance , 1977 .

[20]  Yosef Grodzinsky,et al.  The syntactic characterization of agrammatism , 1984, Cognition.

[21]  Jyotsna Vaid,et al.  Asymmetries in the perception of facial affect: Is there an influence of reading habits? , 1989, Neuropsychologia.

[22]  D. Boles.  Hemispheric differences in the judgment of number , 1986, Neuropsychologia.

[23]  R. Zatorre,et al.  A right-ear advantage for dichotic listening in bilingual children , 1981, Brain and Language.

[24]  S. Levine,et al.  Variations in characteristic perceptual asymmetry: Modality specific and modality general components , 1992, Brain and Cognition.

[25]  A. David.  Perceptual asymmetry for happy-sad chimeric faces: Effects of mood , 1989, Neuropsychologia.

[26]  S. Segalowitz,et al.  Language development and neurological theory , 1977 .

[27]  Jyotsna Vaid,et al.  Bilingualism and Brain Lateralization , 1983 .

[28]  H. Goodglass,et al.  Differential Recognition of Tachistoscopically Presented English and Hebrew Words in Right and Left Visual Fields , 1965, Perceptual and motor skills.

[29]  Jerre Levy,et al.  Perceptual asymmetry for chimeric faces across the life span , 1986, Brain and Cognition.

[30]  D. Boles.  Reaction time asymmetry through bilateral versus unilateral stimulus presentation , 1987, Brain and Cognition.

[31]  David B. Boles,et al.  Factor analysis and the cerebral hemispheres: Pilot study and parietal functions , 1991, Neuropsychologia.

[32]  S. Kravetz,et al.  Hemispheric Specialization or Reading Habits: Evidence from Lexical Decision Research with Hebrew Words and Sentences , 1993, Brain and Language.

[33]  J. Bradshaw,et al.  The use of laterally presented words in research into cerebral asymmetry: Is directional scanning likely to be a source of artifact? , 1981, Brain and Language.

[34]  J. Phillips,et al.  Reversed Perceptual Asymmetry for Faces in Left Unilateral Neglect , 1993, Brain and Cognition.

[35]  Marie T Banich,et al.  Asymmetry of perception in free viewing of chimeric faces , 1983, Brain and Cognition.

[36]  Z. Eviatar.  Reading Direction and Attention - Effects on Lateralized Ignoring , 1995, Brain and Cognition.

[37]  John C. Marshall,et al.  Agrammatism : an analysis and critique, with new evidence from four Hebrew-speaking aphasic patients , 1991 .

[38]  Individual variation in hemispheric asymmetry: multitask study of effects related to handedness and sex. , 1994, Journal of experimental psychology. General.

[39]  Michel Paradis,et al.  Language lateralization in bilinguals: Enough already! , 1990, Brain and Language.

[40]  W. Lambert,et al.  Language processing in bilinguals , 1978, Brain and Language.

[41]  R. Rosenthal.  Combining results of independent studies. , 1978 .