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The case for mental duality: Evidence from split-brain data and other considerations

Published online by Cambridge University Press:  04 February 2010

Roland Puccetti
Roland Puccetti
Affiliation:
Department of Philosophy, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5
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Abstract

Contrary to received opinion among philosophers, psychologists, and neuroscientists, conscious duality as a principle of brain organization is neither incoherent nor demonstrably false. The present paper begins by reviewing the history of the theory and its anatomical basis and defending it against the claim that it rests upon an arbitrary decision as to what constitutes the biological substratum of mind or person.

It then moves on to provide a dynamic model for double consciousness in vertebrate brain organization, giving an evolutionary account that explains why, although each of the two cerebral hemispheres benefits from sensory input from the other for representation of the ipsilateral half of corporeal and extracorporeal space, it was important that conscious experience be confined to each rather than spanning the two. This interhemispheric duplication effect for sensory representation has been known for years but hitherto considered mysterious, or ignored on grounds that integration must be achieved at a higher level of processing.

The paper then attempts to resolve a puzzle about split-brain patients in testing situations, namely why it is that in spite of the speaking hemisphere's denial of any independent perception and agency in the mute hemisphere, which would explain its role in cross-cuing, the latter never seems to resent this, but instead continues to be cooperative and helpful. It is suggested that on the hypothesis of mental duality this is understandable, for the nonverbal hemisphere would have known prior to the surgery that it is not generating linguistic behavior.

Finally, the essay examines two kinds of bitemporal defects, one due to callosal and the other to chiasmal disruptions. On the present theory a bitemporal defect should be demonstrable in the former case when both eyes are open, because in the absence of a corpus callosum and other forebrain commissures the interhemispheric duplication effect is abolished; in the latter case interhemispheric duplication is preserved, and so the defect should be demonstrable only by testing each eye independently. This is indeed what the evidence indicates, so it appears that, contrary to the prevalent view, the function of the corpus callosum is not to integrate and unify conscious experience between the hemispheres but to duplicate this, in accord with the model of mental duality.

Keywords

cerebral hemispheresconsciousnesscorpus callosummental dualityoptic chiasmsplit brain
Type
Target Articles
Information
Behavioral and Brain Sciences , Volume 4 , Issue 1 , March 1981 , pp. 93 - 99
Copyright
Copyright © Cambridge University Press 1981

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References

Akeleitis, A. J. (1945) Studies on the corpus caHosum. IV. Diagonistic dyspraxia in epileptics following partial and complete section of the corpus callosum. American Journal of Psychiatry 101:594–99. [NG]CrossRefGoogle Scholar
Akeleitis, A. J.; Risteen, W. A.; Herren, R. Y.; & Van Wagenen, W. P. (1942) Studies on the corpus callosum 111. Archives of Neurology and Psychiatry 47:971–1007. [RP]Google Scholar
Anderson, R. M. & Leong, D. (in preparation) Brain localization and the explanation of experience. In: Language functions and brain organization, ed. Segalowitz, S. J.. New York: Academic Press. [RMA]Google Scholar
Anderson, S. L. (1976) Coconsciousness and the numerical identity of the person. Philosophical Studies 30:1–10. [RP]CrossRefGoogle Scholar
Baker, A. B. & Baker, L. H. (1977) Clinical Neurology. New York: Harper & Row. [RP]Google Scholar
Bard, L. (1905) De la persistence des sensations lumineuses dans le champ av-eugle des hemianopsiques. Semaine medicate 25:253–55. [JWB]Google Scholar
Battersby, W. S.; Bender, M. B.; Pollack, M.; & Kahn, R. L. (1956) Unilateral spatial agnosia (“inattention”) in patients with cerebral lesions. Brain 79:68–93. [RP]CrossRefGoogle ScholarPubMed
Battista, J. R. (1978) The science of consciousness. In: The stream of consciousness, ed. Pope, K. S. & Singer, J. L.. New York: Plenum Press. [RJD]Google Scholar
Bender, M. B. (1952) Disorders of perception. Springfield, Ill.: Charles C. Thomas. [EAW]Google Scholar
Bender, M. B. (1970) Perceptual Interactions. In: Modern trends in neurology, ed. Williams, D.. London: Butterworth. [EAW]Google Scholar
Bender, M. B. & Furlow, L. T. (1945) Phenomenon of visual extinction in homonymous fields and the psychologic principles involved. Archives of Neurology and Psychiatry 53:29–33. [RMA]CrossRefGoogle Scholar
Benton, A. L. (1956) Jacques Loeb and the method of double stimulation. Journal of the History of Medicine and Allied Sciences 11:47–53. [EAW]CrossRefGoogle ScholarPubMed
Berlucchi, C. (1966a) Electroencephalographic activity of the isolated hemi-cerebrum of the cat. Experimental Neurology 15:220–28. [JEB]CrossRefGoogle ScholarPubMed
Berlucchi, C. (1966b) Electroencephalographic studies in “split brain” cats. Electroencephalography and Clinical Neurophysiology. 20:348–56. [JEB]CrossRefGoogle ScholarPubMed
Binet, A. (1890) On double consciousness. Chicago: Open Court. [DNR]Google Scholar
Binet, A. (1896) Alterations of personality. Translated by Baldwin, H. G.. New York: D. Appleton & Co. [DNR]Google Scholar
Bogen, J. E. (1969) The other side of the brain II: An appositional mind. Bulletin of the Los Angeles Neurological Societies 34:135–62. [RP]Google Scholar
Bogen, J. E. (1977) Further discussion on split-brains and hemispheric capabilities. Brt'tish Journal for the Philosophy of Science 28:281–86. [RP]Google Scholar
Bogen, J. E. (1980) Personal communication. [RP]Google Scholar
Bogen, J. E. & Vogel, P. J. (1962) Cerebral commissurotomy in man: preliminary case report. Bulletin of the Los Angeles Neurological Society 27:169–72. [RP]Google Scholar
Bogen, J. E. & Vogel, P. J. (1975) Neurologic studies in the long term following complete cerebral commissurotomy. In: Les syndromes de disconnexion calleuse chez I'homme, ed. Michel, F. and Schott, B.. Lyon: Hopital Neurologique, 1975. [RP]Google Scholar
Brion, S. & Jedynak, C. P. (1972) Troubles du transfert interhemispherique: Le signe de la main etrangere. Revue Neurologique 4:257–66. [NG]Google Scholar
Brown, J. W. (1977) Mind, brain and consciousness. New York: Academic Press. [JWB]Google Scholar
Brown, J. W. (1979) Language representation in the brain. In: Neurobiology of social communication in primates, ed. Steklis, H. & Raleigh, M.. New York: Academic Press. [JWB]Google Scholar
Brown-Séquard, C. E. (1877) Dual character of the brain. Toner Lecture No. 2. Washington: Smithsonian. [RP]Google Scholar
Burklund, C. W. and Smith, A. (1977) Language and the cerebral hemispheres. Neurology 27:627–33. [NG]CrossRefGoogle ScholarPubMed
Chadwick, J. & Mann, W. N. (1950) The medical works of Hippocrates. Oxford: Blackwell. [RP]Google Scholar
Clarke, E. & Dewhurst, K. (1972) An illustrated history of brain function. Berkeley and Los Angeles: University of California Press. [RP]Google Scholar
Cowey, A. (1964) Projection of the retina onto the striate and prestriate cortex in the squirrel monkey, Saimiri sciureus. Journal of Neurophysiology 27:366–93. [RMA]CrossRefGoogle Scholar
Dandy, W. E. (1928) Removal of right cerebral hemisphere for certain tumors with hemiplegia: Preliminary report. Journal of the American Medical Association 90:823–25. [NG]CrossRefGoogle Scholar
Davidson, J. M. & Davidson, R. J., eds. (1980) The psycholtiology of consciousness. New York: Plenum Press. [RJD]CrossRefGoogle Scholar
Davidson, R. J. (1980) Consciousness and information processing: A biocogni-tive perspective. In: The psychobiology of consciousness, ed. Davidson, J. M. and Davidson, R. J.. New York: Plenum Press. [RJD]Google Scholar
Dejerine, J. (1892) Des differentes varietes de cecite verbale. Memoires de la Societe de Biologic 1–30. [NG]Google Scholar
Denny-Brown, D. & Fischer, E. (1976) Physiological aspects of visual perception. Archives of Neurology 33:228–42. [JWB]Google Scholar
Denny-Brown, D.; Meyer, J. S.; & Horenstein, S. (1952) The significance of perceptual rivalry resulting from parietal lesion. Brain 75:433–71. [RP]CrossRefGoogle ScholarPubMed
Dimond, S. J. (1972) The double brain. Edinburgh and London: Churchill Livingston. [RP]Google Scholar
Dimond, S. J. ed. (1974) The roots of psychology. New York: Basic Books. [MBG]Google Scholar
Dimond, S. J. (1977) Personal communication. [RP]Google Scholar
Dimond, S. J. & Beaumont, J. G. (1974) Experimental studies of hemisphere function in the human brain. In: Hemisphere function in the human brain, Dimond, S. J. and Beaumont, J. G.. New York: Halsted. [RJD]Google Scholar
Doty, R. W. (1975) Consciousness from neurons. Neurobiologiae Experimen-talis (Warsaw) 35:791–804. [JCE]Google ScholarPubMed
Eccles, J. C. (1970) Facing reality, p. 78. New York: Springer-Verlag. [RJJ]Google Scholar
Eccles, J. C. (1976) The human mystery. New York: Springer-Verlag. [RP]Google Scholar
Eccles, J. C. (1980) The human psyche. Berlin: Springer Verlag. [JCE]Google Scholar
Efron, R. (1963) The effect of handedness on the perception of simultaneity and temporal order. Brain 86:261–84. [NG]CrossRefGoogle Scholar
Ellenberg, L. & Sperry, R. (1980) Lateralizecl division of attention in the com-missurotomized and intact brain. Ncuropsychologia 18:411–18. [JEB]Google Scholar
Flourens, P. (1846) Phrenology examined. Translated by Meigs, C.. Philadelphia: Hogan and Thompson. [DNR]CrossRefGoogle Scholar
Franco, L. & Sperry, R. W. (1977) Hemisphere lateralization for cognitive processing of geometry. Ncuropsychologia 15:107–11. [RP]CrossRefGoogle ScholarPubMed
Gazzaniga, M. S. (1970) The bisected brain. New York: Appleton-Century-Crofts. [JEL, RP, EAW]Google Scholar
Gazzaniga, M. S. & LeDoux, J. E. (1978) The integrated mind. New York and London: Plenum Press. [JEB, RP, JEL]Google Scholar
Gazzaniga, M. S.; LeDoux, J. E.; & Wilson, D. H. (1978) Language, praxis and the right hemisphere: Clues to some mechanisms of consciousness. Neurology 27:1144–47. [JEL]Google Scholar
Gazzaniga, M. S.; Wilson, D. H.; & LeDoux, J. E. (1977) Neurology 27:281–84. [JEL]CrossRefGoogle Scholar
Geschwind, N. (1965) Disconnexion syndromes in animals and man. Brain 88:237–94, 585–644. [NG, RP]Google Scholar
Goldstein, K. (1908) Zur Lehre der motorischen Apraxie. Journal fi'ir Psychologic und Neurologic. 11:169–87 and 270–83. [NG]Google Scholar
Green, M. B. (1979) The grain objection. Philosophy of Science 46, no. 3:559–89. [MBG]Google Scholar
Guiard, Y. (in press) Cerebral hemispheres and selective attention. Acta Psy-chologica. [EAW]Google Scholar
Gunderson, K. (1971) Robots, consciousness and programmed behavior. In: Mentality and machines, ed. Gunderson, K.. New York: Double-day. [KVW]Google Scholar
Gur, R. C.; Packer, I. K.; Hungerbuhler, J. P.; Reivich, J.; Obrist, W. D.; Amarnek, W. S.; Sackeim, H. A. (1980) Differences in distribution of gray and white matter in human cerebral hemispheres. Science 207:1226–28. [RJD]CrossRefGoogle ScholarPubMed
Harrington, D. O. (1971) The visual fields: A textbook and atlas of clinical perimetry. Saint Louis: C. V. Mosby Co. [RMA]Google Scholar
Harrington, D. O. (1976) The visual fields, 4th ed.St. Louis, Mo.: C. V. Mosby Co. [RP]Google Scholar
Heilman, K. & Watson, R. T. (1977) Mechanisms underlying the unilateral neglect syndrome. In: Hemi-inattcntion and hemisphere specialization, ed. Weinstein, E. A. and Friedland, R. P.. New York: Raven Press. [EAW]Google Scholar
Hilgard, Ernest (1977) Divided consciousness. New York: John Wiley and Sons. [PSC]Google ScholarPubMed
Holland, H. (1840) Medical notes and reflections. London: Longman, Brown, Greene, & Longmans. [DNR]Google Scholar
Holtzman, J.; Sidtis, J.; Volpe, B.; & Gazzaniga, M. (1980) Attentional unity following brain bisection in man. Ncuroscience Abstracts 6.195. [JWB]Google Scholar
Ingvar, D. H.; Brun, A.; Johansson, I.; & Samuelsson, S. M. (1978) Survival after severe cerebral anoxia with destruction of the cerebral cortex: The apallic syndrome. Annals of the New York Academy of Sciences 315:184–214. [HP]CrossRefGoogle ScholarPubMed
Jackson, J. H.Selected writings of John Hughlings Jackson. (1874; reprint 1958) New York: Basic Books. [RP]Google Scholar
Kinslxnirne, M. (1980) Brain-based limitations on mind. In: Body and mind: past, present and future, ed. Rieber, R., New York: Academic Press. [RP]Google Scholar
Keele, S. (1973) Attention and human performance. Pacific Palisades: Goodyear. (JLB)]Google Scholar
LcDoux, J. E. & Gazzaniga, M. S. (1980; in press) On the nature and mechanisms of human conscious experience. Scientific American. [RP]Google Scholar
LcDoux, J. E.; Wilson, D. H.; & Gazzaniga, M. S. (1977) A divided mind: Observations on the conscious properties of the separated hemispheres. Annals of Neurology 2:417–24. [JKL]Google Scholar
LcDoux, J. E.; Wilson, D. H.; & Gazzaniga, M. S. (1979) Beyond commissurotomy: Clues to the mechanisms of consciousness. In: Handbook of neuropsychology, ed. Gazzaniga, M. S.. New York: Pienum Press. [JEL]Google Scholar
Levy, J. (1977) Manifestations and implications of shifting hemi-inattention in commissurotomy patients. In: Hemi-inattention and hemisphere specialization, ed. Weinstein, K. A. and Friedland, R. P.. New York: Raven Press. [KAW]Google Scholar
Liepmann, H. (1900) Das Krankheitsbild der Apraxie. Berlin: Karger. [NG]Google Scholar
Luria, A. R. (1966) Higher cortical functions in man. New York: Basic Books. [RMA]Google Scholar
Marks, C. E. (1980) Commissurotomy, consciousness, and unity of mind. Montgomery, Vt.: Bradford Monographs. [JEB, RP]Google Scholar
Meehl, P. E. (1966) The compleat autocerebroscopist: A thought-experiment on Professors Keigl's mind-body identity thesis. In: mind, matter, and method: Essays in philosophy and science in honor of Herbert Feigl, ed. Eeyerabend, P. K. & Maxwell, G., pp. 103–80. Minneapolis: University of Minnesota Press. [MBG]Google Scholar
Mesulam, M.-M.; Waxman, S. G.; Geschwind, N.; & Sabin, T. D. (1976) Acute confusional states with right middle cerebral artery infarctions. Journal of Neurology, Neurosurgery, and Psychiatry 39:84–89. [NG]Google Scholar
Michel, K. (1972) Sleep and waking in cats with various sagittal sections of the brain. In: Cerebral interhemisphcric relations, ed. Cernacek, J. & Podivinsky, F.. Bratislava: Vydavalestvo Slovenskej Akad. [JEB]Google Scholar
Michel, K. & Roffwarg, H. P. (1967) Chronic split brain stem preparation: Effect on the sleep-waking cycle. Expcrientia 23:126–28. [JEB]CrossRefGoogle ScholarPubMed
Mukhametov, L. M.; Supin, A. Y.; & Polyakova, I. G. (1977) Interhemispheric asymmetry of the electroencephalographic sleep patterns in dolphins. Brain Bcscarch 134:581–84. [JEB[CrossRefGoogle ScholarPubMed
Nagel, T. (1971) Brain bisection and the unity of conscious experience. Syn-these 22:396–413. [RP]Google Scholar
Nebes, R. (1978) Direct examination of cognitive function in the right and left hemispheres. In: Asymmetrical function of the brain, ed. Kinsbourne, M.. Cambridge: Cambridge University Press. [JWB]Google Scholar
Nisbett, R. E. & Wilson, T. D. (1977) Telling more than we can know: Verbal reports on mental processes. Psychological Review 84:231–59. [RJD]Google Scholar
Paget, S. (1979) Sir Victor Horsley. London: Constable. [RP]Google Scholar
Piaget, J. (1973) The affective and the cognitive unconscious. Journal of the American Psychoanalytic Association 21:249–61. [RJD]CrossRefGoogle ScholarPubMed
Plum, F. & Posner, J. (1966) Diagnosis of stupor and coma. Philadelphia: Davis. [JEL]Google Scholar
Poppelreuter, W. K. (1917) Die Psychische SchSdigungen durch Kopfschuss im Krieg 1914–1916: Die Stdrungen der niedcren und hbheren Leis-tungen durch Vcrlctzungcn des Okzipitalhims. Vol. 1. Leipzig: Leopold Voss. [EAW]Google Scholar
Popper, K. R. & Eccles, J. C. (1977) The self and its brain. Berlin: Springer International. [JCE, RP, DNR]Google Scholar
Puccetti, R. (1973) Brain bisection and personal identity. British Journal of Philosophy of Science 24:339–55. [JEB, JCE, RP]CrossRefGoogle Scholar
Puccetti, R. (1977) Bilateral organization of consciousness in man. Annals of the New York Academy of Sciences 299:448–58. [RP]Google Scholar
Puccetti, R. & Dykes, R. W. (1978) Sensory cortex and the mind-brain problem. Behavioral and Brain Sciences 3:337–75. [RP]Google Scholar
Helton, R. M. & Davison, L. A., eds. (1974) Clinical neuropsychology: Current status and applications. Washington, D.C.: V. H. Winston. [RMA & JFG]Google Scholar
Robinson, D. N. (1976a) What sort of persons are hemispheres?: Another look at the “split-brain” man. British Journal for the Philosophy of Science 27:73–78. [DNR]CrossRefGoogle Scholar
Robinson, D. N. (1976b) An intellectual history of psychology, pp. 392–98. New York: Mae-millan. [DNH]Google Scholar
Ribot, T.The diseases of personality, 4th ed. (1906) Authorized translation. Chicago: Open Court. [DNR]Google Scholar
Salamy, A. (1978) Commissural transmission: Maturational changes in humans. Science 200:1409–11. [RJD]CrossRefGoogle ScholarPubMed
Saul, R. & Sperry, R. W. (1968) Absence of commissurotomy symptoms with agenesis of the corpus callosum. Neurology 18:307. [RP]Google Scholar
Savage, W. (1975) An old ghost in a new body. In: Mind and brain: Philosophic and scientific strategies, ed. Globus, G. G., Maxwell, G., & Savodnik, I.. pp. 125–53. New York: Plenum Publishing. [JCE]Google Scholar
Schwartz, A. S.; Marchok, P. L.; Kreinick, C. J.; & Flynn, R. E. (1979) The asymmetric lateralization of tactile extinction in patients with unilateral cerebral dysfunction. Brain 102:669–84. [EAW]Google Scholar
Serafetinides, E. A.; Shurley, J. T.; & Brooks, R. E. (1972) Electroencephalogram of the pilot whale, Globicephala scammoni, in wakefulness and sleep: Lateralization aspects. International Journal of Psychobiology 2:129–35. [JEB]Google Scholar
Smith, A. (1966) Speech and other functions after left (dominant) hemispher-ectomy. Journal of Neurology, Neurosurgery and Psychiatry 29:467–71. [RP]Google Scholar
Sparks, R. & Geschwind, H. (1968) Dichotic listening in man after section of neocortical commissures. Cortex 4:3–16. [NG]CrossRefGoogle Scholar
Sperry, R. W. (1961) Cerebral organization and behavior. Science 133:1749–57. [RP]CrossRefGoogle ScholarPubMed
Sperry, R. W. (1962) Orderly function with disordered structure. In: Principles of self-organization, ed. Von Foerster, H. & Zopf, G. W.. New York: Pergamon Press. [RP]Google Scholar
Sperry, R. W. (1968) Hemisphere deconnection and the unity of conscious experience. American Psychologist 23:723–33. [JEB, RP]Google Scholar
Sperry, R. W. (1970) Perception in the absence of the neocortical commissures. In: Perception and its disorders. New York: Association for Research into Nervous and Mental Diseases. [JEB, RP]Google Scholar
Sperry, R. W. (1977) Reply to Professor Puccetti. The Journal of Medicine and Philosophy 2:145–6. [JEB, RP]Google Scholar
Sperry, R. W.; Gazzaniga, M. S.; & Bogen, J. E. (1969) Interhemispheric relationships: The neocortical commissures; syndromes of hemispheric disconnection. In: Handbook of clinical neurology IV, ed. Vinken, P. J. & Bruyn, G. W.. Amsterdam: North Holland. [RP]Google Scholar
Sperry, R. W.; Zaidel, E.; & Zaidel, D. (1979) Self-recognition and social awareness in the deconnected minor hemisphere. Neuropsychologia 17:153–66. [JEB, JCE, RP, EAW]CrossRefGoogle ScholarPubMed
Strawson, P. (1959) Individuals. London: Methuen. [JCE]Google Scholar
Teuber, H. L.; Battersby, W. S.; & Bender, M. D. (1960) Visual field defects after penetrating missile wounds of the brain. Cambridge, Mass: Harvard University Press. [RMA]CrossRefGoogle Scholar
Trevarthen, C. B. (1962) Double visual learning in split brain monkeys. Science 136:258–59. [RP]Google Scholar
Trevarthen, C. B. (1974) Functional relations of disconnected hemispheres with the brain stem and with each other. In: Hemispheric disconnection and cerebral function, ed. Kinsbourne, M. & Smith, W.. Springfield, Mass.: Thomas. [JWB]Google Scholar
Trevarthen, C. B. & Sperry, R. W. (1973) Perceptual unity of the ambient visual field in human commissurotomy patients. Brain 96:547–70. [JEB.RP]Google Scholar
Underwood, G. (1975) Attention and memory. New York: Pergamon Press. [JLB]Google Scholar
Weinstein, E. A. & Cole, M. (1963) Concepts of anosognosia. In: Problems of dynamic neurology, ed. Halpern, L.. Jerusalem: Hebrew University Press. [RP]Google Scholar
Weinstein, E. A. & Freidland, R. P. (1977) Behavioral disorders associated with hemi-inattention. In: Hemi-inattention and hemisphere specialization, ed. Weinstein, E. A. and Friedland, R. P.. New York: Raven Press. [EAW]Google Scholar
Weiskrantz, L.; Warrington, E. K.; Sanders, M. D.; & Marshall, J. (1974) Visual capacity in the hemianopic field following a restricted occipital ablation. Brain 97:709–28. [RMA, JEB]Google Scholar
Welman, A. J. (1969) Right-sided unilateral visual spatial agnosia, asomatagno-sia and anosognosia with left hemisphere lesions. Brain 92:571–80. [RP]Google Scholar
White, Andrew Dickson (1896; reprinted 1978) A history of the warfare of science with theology in Christendom. Gloucester, Mass.: Peter Smith. [PSC]Google Scholar
Wigan, A. L. (1844) The duality of the mind: A new view of insanity. London: Longman, Brown, Green and Longmans. [JEB, RP]CrossRefGoogle Scholar
Wilkes, K. V. (1978) Consciousness and commissurotomy. Philosophy 53:185–99. [RP]Google Scholar
Young, J. Z. (1962) Why do we have two brains? In: Interhemispheric relations and cerebral dominance, ed. Mountcastle, V. B.. Baltimore: Johns Hopkins Press. [RP]Google Scholar
Zahar, E. (1973) Why did Einstein's programme supersede Lorentz's? British Journal for the Philosophy of Science 24:95–124, 223–320. [RP]CrossRefGoogle Scholar
Zangwill, O. L. (1973) Consciousness and the cerebral hemispheres. In: Hemisphere function in the human brain, ed. Dimond, J. J. & Beaumont, J. G.. New York: John Wiley. [JCE]Google Scholar