Osman GENÇ, Günfer TURGUT, Türker ŞAHİNER

Hoffmann refleksi ile cinsiyet hormonları ve nonverbal zeka arasındaki korelasyon: Cinsiyet ve el tercihi ile ilgisi

Amaç: Bu çalışma kadın ve erkekte, el ve ayak tercihi göz önüne alınarak Hoffmann refleksi (H-refleks), cinsiyet hormonları ve nonverbal zekanın birbirleriyle ilişkisini araştırmak amacıyla yapıldı. Yöntem: Çalışmaya gönüllü katılan 21 üniversite öğrencisinde el tercihi Edinburg el tercihi anketi ile araştırıldı. Ayak tercihi topa vurma tercihine göre belirlendi. El becerisi çivi takma testi ile sağ ve sol el için ayrı ayrı değerlendirildi. Sağ ve sol bacaktan H-refleksi kaydedildi. Nonverbal zeka (IQ) ölçümü için Cattell's Culture Free Intelligence Test kullanıldı. Serum total testosteron ve estradiol düzeyleri ticari kitlerle tayin edildi. Bulgular: Sağlak erkeklerde (n=8) IQ ile H-refleks alan, sol el çivi takma zamanı ve estradiol arasında ilişki vardı. Sağlak kızlarda (n=6) IQ ile estradiol arasında anlamlı ilişki bulundu. Solak kızlarda (n=7) IQ ile sol H-refleks alan arasında anlamlı ilişki var iken sağlak erkekler ile sağlak ve solak bayanlarda H-refleks latens, amplitüd ve alanı ile testosteron ve estradiol arasında anlamlı bir ilişki saptanamadı. Sonuç: Bu bulgular, sağlak erkeklerde IQ düzeyi arttıkça sağ H-refleks alanının azaldığını, sağ ve sol H-refleks amplitüdünün arttığını, sol el becerisinin azaldığını ve serum estradiol miktarının azaldığını; sağlak bayanlarda IQ arttıkça serum estradiol miktarının azaldığını; solak bayanlarda ise IQ arttıkça sol H-refleks alanının azaldığını göstermektedir.

Anahtar Kelimeler:

Baskınlık, serebral, Östradiol, H-refleksi, El, Zeka, Zeka testleri, Motor beceri, Sinir sistemi fizyolojisi, Nöropsikolojik testler, Psikomotor performans, Psikofizyoloji, Refleks, Cinsiyet, Cinsiyet özellikleri, Cinsiyet faktörleri, Testosteron, Seks hormonları

Correlation between sex hormones and Hoffmann reflexes and nonverbal intelligence: Differences with sex and hand preference

Objective: This study was planned to investigate the relationship between Hoffmann reflexes (H-reflex) and sex hormones and nonverbal intelligence in female and male subjects. Methods: An Edinburgh Handedness Questionnaire was performed on 21 volunteer University Students for hand preference. Foot preference was determined according to the kicking ball preference. Hand skill for both left and right hands were tested by using peg moving test. H-reflexes were recorded on both right and left leg. Nonverbal intelligence (IQ) was determined with Cattell's Culture Fair Intelligence Test. Serum testosterone and estradiol levels of the subjects were measured with commercial kits. Results: In the righ handed males (n=8) IQ correlated to H-reflex area, left hand peg moving time and the estradiol levels while in the right handed females (n=6) IQ correlated to estradiol levels. Left handed females (n=7) had also significant relationship between IQ and left H-reflex area. Right handed males as well as right and left handed females showed no significant relationship between H-reflex (latency, amplitude and area) and testosterone and estradiol levels. Conclusion: Moreover, as levels of IQ increases, right H-reflex area decreases, right and left H-reflex amplitude increases, left hand skill decreases and levels of serum estradiol decreases in right handed males. As IQ of right handed females increases, serum estradiol levels decreases. As IQ of left handed females increases, left H-reflex area decreases.

Keywords:

Dominance, Cerebral, Estradiol, H-Reflex, Hand, Intelligence, Intelligence Tests, Motor Skills, Nervous System Physiology, Neuropsychological Tests, Psychomotor Performance, Psychophysiology, Reflex, Sex, Sex Characteristics, Sex Factors, Testosterone, Sex Hormones,

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Lehrl S, Fisher B. A basic information psychological parameter (BIP) for the reconstruction of concepts of intelligence. Eur J Personality 1990;4:259-86.
Eysenck HJ. The theory of intelligence and the psychophysiology of cognition. In: Sternberg RJ, editor. Advance in the psychology of human intelligence. New Jersey: Lawrence Erlbaum; 1986.
Mackintosh NJ. The biology of intelligence. B J Psychol 1986;77:1-8.
Tan Ü, Akgün A, Komşuoğlu S, Telatar M. Inverse relationship between nonverbal intelligence and the parameters of pattern reversal visüel evoked potentials in left-handed male subjects: Importance of right brain and testosterone. Int J Neurosci 1993; 71:189-200.
Galton F. Hereditary genius: Inquiry into its laws and consequences. London: McMillan; 1892.
Tan Ü. The inverse relationship between nonverbal intelligence and the latency of the Hoffmann reflex from the right and left thenar muscles in right- and left-handed subjects. Int J Neurosci 1991;57:219-38.
Annett M. Left, right hand and brain: The right shift theory. London: Erlbaum Assoc Ltd; 1985.
Annett M. Predicting from the right shift theory. Behav Brain Sci 1991;14:338-41.
Geschwind N, Behan P. Left handedness: Association with immune disease, migraine and developmental learning disorder. Proceed Nat Acad Sci 1982;79:5097-100.
Tan Ü. The relationship of latency characteristics of the Hoffmann reflex from the right and left thenar muscles to serum testosterone levels in right-handed male and female subjects. Intl J Neurosci 1991;57:51-9.
Geschwind N, Galaburda AM. Cerebral lateralization: Biological mechanisms, associations and pathology-I: A hypothesis and a program for research. Arch Neurol 1985;42:428-59.
Geschwind N, Galaburda AM. Cerebral lateralization: Biological mechanisms, associations and pathology-II: A hypothesis and a program for research. Arch Neurol 1985;42:521-2.
Geschwind N, Galaburda AM. Cerebral lateralization: Biological mechanisms, associations and pathology-III: A hypothesis and a program for research. Arch Neurol 1985;42:634-54.
Broverman DM, Broverman JK, Vogel W, Plamer RD. The automatization of cognitive style and physical development. Child Development 1964;35:1343-59.
Broverman DM, Klaiber EL, Kobayashi Y, Vogel W. Roles of activation and inhibition in sex differences in cognitive abilities. Psychol Rev 1968;75:23-50.
Klaiber EL, Broverman DM, Kobayashi Y. The automatization cognitive style, androgens and monoamine oxidase. Psychopharmacol 1967;11:320-36.
Oldfield RC. The assessment and analysis of handedness: The Edinburg Inventory. Neuropyschologia 1971;9:97-113.
Tan Ü. The distribution of hand preference in normal men and women. Int J Neurosci 1988;41:35-65.
Tan Ü. Relationships between hand skill and the excitability of motoneurons innervating the postural soleus muscle in human subjects. Int J Neurosci 1985;26:289-300.
Tan Ü. A close relationship between hand skill and the excitability of motor neurons innervating the postural soleus muscle in right-handed female subjects. Int J Neurosci 1990;52:17-23.
Jacklin CN, Wilcox KT, Maccoby EE. Neonatal sex-steroid hormones and intellectual abilities at six years. Develop Psychobiol 1988;21:567-74.
Gökbel H, Çalışkan S. El tercihi, el becerisi ve el kavrama kuvveti ile testosteron arasındaki ilişkiler. Genel Tıp Derg 1998;8:13-6.
Gökbel H, Çalışkan H, Kavun (Dölek) Ç. Genç erişkinlerde el tercihi ile testosteron seviyeleri arasındaki ilişki. SÜ Tıp Fak Derg 1992;8:207-9.
Tan Ü. The relationship between serum testosterone level and Hoffmann reflex from the long flexor thumb muscle in right-handed young adults. Int J Neurosci 1991;56:1-11.
Schafer EWP. Brain responses while viewing television reflect program interest. Int J Neurosci 1978; 8:71-7.