International Journal of Neuroscience
ISSN: 0020-7454 (Print) 1543-5245 (Online) Journal homepage: http://www.tandfonline.com/loi/ines20
Methodological Flaws in Study by Tan To cite this article: (1992) Methodological Flaws in Study by Tan, International Journal of Neuroscience, 65:1-4, 183-183, DOI: 10.3109/00207459209003291 To link to this article: http://dx.doi.org/10.3109/00207459209003291
Published online: 07 Jul 2009.
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Date: 14 March 2016, At: 19:57
Intern. J . Neuroscience, 1992, Vol. 65, p. 183 Reprints available directly from the publisher Photocopying permitted by license only
C 1992 Gordon and Breach Science Publishers S . A . Printed in the United States of America
Letter to the Editor METHODOLOGICAL FLAWS IN STUDY BY TAN
Downloaded by [37.49.226.236] at 19:57 14 March 2016
(Received November 20, 1991)
To The Editor Prof. Tan finds high serum testosterone levels in adults with, “anomalous” hand dominance (this journal, 1991, 58, 211-214). In my opinion, there are three methodological flaws in his study. First, following the example of Geschwind, Behan and Galaburda, the author includes in the so called anomalous dominance subgroup left-handers, mixed-handers, and right-handers with at least one nonright-handed first degree relative. Putting actual right-handers with family sinistrality in the same category as nonright-handers is unwarranted and quite arbitrary. On this slippery ground, why not go the whole way and settle by symmetry that actual left- and mixed-handers with family dextrality are right-handers? And why bother using the Oldfield Handedness Inventory when the family hand-preference history would settle the issue? Given this controversial classification of handedness, the reader is at least entitled to learn the testosterone levels in actual right-handers, whatever their family background. Second, this classification suggests, without evidence, a genetic connotation in the ievel of testosterone secretion in individuals and families. Third, the author infers, again without evidence, that high testosterone levels in adults imply a high testosterone environment during embryonic and foetal life, the very period when cerebral asymmetry develops. Badrig A. MELEKIAN M.D.
183
ISSN: 0020-7454 (Print) 1543-5245 (Online) Journal homepage: http://www.tandfonline.com/loi/ines20
Methodological Flaws in Study by Tan To cite this article: (1992) Methodological Flaws in Study by Tan, International Journal of Neuroscience, 65:1-4, 183-183, DOI: 10.3109/00207459209003291 To link to this article: http://dx.doi.org/10.3109/00207459209003291
Published online: 07 Jul 2009.
Submit your article to this journal
Article views: 3
View related articles
Full Terms & Conditions of access and use can be found at http://www.tandfonline.com/action/journalInformation?journalCode=ines20 Download by: [37.49.226.236]
Date: 14 March 2016, At: 19:57
Intern. J . Neuroscience, 1992, Vol. 65, p. 183 Reprints available directly from the publisher Photocopying permitted by license only
C 1992 Gordon and Breach Science Publishers S . A . Printed in the United States of America
Letter to the Editor METHODOLOGICAL FLAWS IN STUDY BY TAN
Downloaded by [37.49.226.236] at 19:57 14 March 2016
(Received November 20, 1991)
To The Editor Prof. Tan finds high serum testosterone levels in adults with, “anomalous” hand dominance (this journal, 1991, 58, 211-214). In my opinion, there are three methodological flaws in his study. First, following the example of Geschwind, Behan and Galaburda, the author includes in the so called anomalous dominance subgroup left-handers, mixed-handers, and right-handers with at least one nonright-handed first degree relative. Putting actual right-handers with family sinistrality in the same category as nonright-handers is unwarranted and quite arbitrary. On this slippery ground, why not go the whole way and settle by symmetry that actual left- and mixed-handers with family dextrality are right-handers? And why bother using the Oldfield Handedness Inventory when the family hand-preference history would settle the issue? Given this controversial classification of handedness, the reader is at least entitled to learn the testosterone levels in actual right-handers, whatever their family background. Second, this classification suggests, without evidence, a genetic connotation in the ievel of testosterone secretion in individuals and families. Third, the author infers, again without evidence, that high testosterone levels in adults imply a high testosterone environment during embryonic and foetal life, the very period when cerebral asymmetry develops. Badrig A. MELEKIAN M.D.
183
