title: The relationships between the degree of grasp-reflex asymmetry, grasp-reflex strength from the right and left hands, and body weight in the male and female newborn with and without familial sinistrality.
abstract: The relation of the degree of grasp-reflex asymmetry to the strength of right- and left-hand grasp-reflex strength and body weight was studied in human newborn. In the total sample (N = 103), the right minus left (R-L) reflex strength was found to be positively linearly related to the grasp-reflex strengths from the right and left hands in FS-subjects; the correlation was higher for the right hand than the left hand. In FS+ subjects (N = 17), there was not a significant correlation between R-L and right-reflex strength; left-reflex strength was found to be negatively linearly related to the R-L reflex strength. In FS- subjects, the right- and left-reflex strengths showed a positive linear correlation with body weight. In FS+ subjects, only the left-reflex showed a positive linear correlation with body weight. The R-L reflex tended to be positively correlated with body weight in FS- subjects and negatively correlated in FS+ subjects. In females (N = 58), the relation of R-L to right and left reflex was similar to that for the total sample. There was no significant correlation between grasp reflex and body weight in FS- females. In FS+ females (N = 8), there was a positive linear correlation between the right grasp-reflex and body weight; the left grasp-reflex did not show such a significant correlation. The R-L grasp-reflex strength was not correlated with body weight in females.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Atatürk University, Medical Faculty, Department of Physiology, Erzurum, Turkey.
authors.forename: U
authors.initials: U
authors.lastname: Tan
authors.forename: R
authors.initials: R
authors.lastname: Ors
authors.forename: M
authors.initials: M
authors.lastname: Kürkçüoglu
authors.forename: N
authors.initials: N
authors.lastname: Kutlu
authors.forename: A
authors.initials: A
authors.lastname: Cankaya
mesh_terms: D001835:Body Weight; D001921:Brain / Q000502:physiology; D005190:Family; D005260:Female; D007839:Functional Laterality / Q000235:genetics / Q000502:physiology*; D006225:Hand / Q000502:physiology*; D006801:Humans; D007231:Infant, Newborn / Q000502:physiology*; D008297:Male; D009119:Muscle Contraction; D012018:Reflex / Q000235:genetics / Q000502:physiology*; D012737:Sex Factors