Anatomic Functional and Cognitive Asymmetries In Monozygotic Twins With Discordant Handedness

Yıl 2014, Cilt: 19 Sayı: 4, 185 - 190, 23.03.2015

Özlem Ergül Erkeç Yalçın Yetkin

Öz

Discordant handedness observed at a higher rate than expected in monozygotic (MZ) twins. This study was designed to investigate the degree of asymmetry in terms of anatomical, functional (motor) and cognitive (IQ and visual memory) features on 27 MZ twins for discordant handedness according to Edinburgh Handedness Inventory (EHI). There was statistically significant difference between EHI and Yetkin Laterality Questionnaire (YLQ). Mixed handers were found lack of cerebral dominance. Both left and right handed subjects were found left hemisphere dominance. There was no statistically significant difference in terms of anatomic or cognitive features between MZ twin members with discordant handedness.

Key words: Laterality, monozygotic twins, dominant hemisphere, anatomic symmetry, IQ.

 

Anahtar Kelimeler

Laterality, monozygotic twins, dominant hemisphere, anatomic symmetry, IQ

Kaynakça

• Fujinaga M. Development of sidedness of asymmetric body structures in vertebrates. Int J Dev Biol 1997; 41: 153-186.
• Annett M. Cerebral asymmetry in twins: predictions of the right shift theory. Neuropsychologia 2003; 41: 469-479.
• Jäncke L, Steinmetz H. Hand motor performance and degree of asymmetry in monozygotic twins. Cortex 1995; 31: 779-785.
• Kee DW, Cherry BJ, Neale PL, McBride DM, Segal NL. Multitask analysis of cerebral hemisphere specialization in monozygotic twins discordant for handedness. Neuropsychology 1998; 12: 468.
• Lux S, Keller S, Mackay C, et al. Crossed cerebral lateralization for verbal and visuo-spatial function in a pair of handedness discordant monozygotic twins: MRI and fMRI brain imaging. Journal of anatomy 2008; 212: 235-248.
• Oldfield RC. The assessment and analysis of handedness: the Edinburgh inventory. Neuropsychologia 1971; 9: 97-113.
• Yetkin Y. The examination of preferences related to the using of right or left hand, foot and eye. Tr J Med Sci 1993; 19: 133-142.
• Reiss M, Tymnik G, Kogler P, Kogler W, Reiss G. Laterality of hand, foot, eye, and ear in twins. Laterality Asymmetries of Body Brain and Cognition 1999; 4: 287-297.
• Tan Ü. The distribution of hand preference in normal men and women. International Journal of Neuroscience 1988; 41: 35-55.
• Cattell RB. A culture-free intelligence test. I Journal of Educational Psychology 1940; 31: 161.
• Alder H. The Right Brain Manager: How to Use the Power of Your Mind to Achieve Personal and Professional Success (2nd ed). London: Piatkus Books, 1999.
• Field J. Psycholinguistics: The key concepts (3rd ed.). New York: Routledge, 2008.
• Corballis MC. The evolution and genetics of cerebral asymmetry. Philosophical Transactions of the Royal Society B Biological Sciences 2009; 364: 867-879.
• Clark CM, Klonoff H, Tyhurst JS. Handedness concordance and intelligence discrepancies in identical twins. Archives of Clinical Neuropsychology 1986; 1: 351-356.
• Khosravizadeh P and Teimournezhad S. Handedness and Lateralization of the Brain. Brain Broad Research in Artificial Intelligence and Neuroscience 2010; 2: 11-16.