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2 results

  • 12 - Language lateralization in patients with formal thought disorder

  • from Section 2 - Language lateralization and psychosis
  • Edited by Iris E. C. Sommer, Universiteit Utrecht, The Netherlands, René S. Kahn, Universiteit Utrecht, The Netherlands
  • Book:
    Language Lateralization and Psychosis
    Published online:
    10 December 2009
    Print publication:
    16 April 2009, pp 169-180

  • Summary

    Modern theories of genetic influence on lateralization suggest that random or fluctuating asymmetry has an important role. Theories of directional asymmetry or chance can be distinguished from the right shift (RS) theory that accidental asymmetries are universal for bilaterally symmetrical organisms. The right shift (RS) theory developed through a series of stages of empirical research and theoretical analysis. Briefly, the theory suggests that degrees of hand preference map onto a non-genetic normal distribution of asymmetry for hand skill, a continuum of right minus left (R - L) skill. The RS model explains relations between handedness and cerebral speech laterality. The key argument, for most skeptics of genetic influence on handedness, is the discordance of monozygotic (MZ) pairs. An early attempt to study the inheritance of brain asymmetries used a dichotic listening test in 49 families.

  • Congenital Anomalies in Twins in Aberdeen and Northeast Scotland

  • G. Corney, I. MacGillivray, D.M. Campbell, B. Thompson, J. Little
  • Journal:
    Acta geneticae medicae et gemellologiae: twin research / Volume 32 / Issue 1 / January 1983
    Published online by Cambridge University Press:
    01 August 2014, pp. 31-35
    Print publication:
    January 1983
    • Article
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  • Data with regard to the proportion of congenital malformations found at birth are presented from a survey of 657 pairs of twins of known zygosity and placentation delivered in Aberdeen and Northeast Scotland between 1968 and 1979. There was an excess of malformed individuals from monozygotic (MZ) pairs, but this did not reach statistical significance. The possible effect of monochorionic placentation in the causation of malformations in MZ twins in general is discussed. It seems that this type of placentation may be of less causative importance than has been previously suggested.