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PubMed1981

[Hand-stretching reflex in children of different age and sex indicative for left- or right-handedness (author's transl)].

Young boys and girls when opening their mouth show an involuntary movement of one or both hands, i.e. slight flexion with maximal extension of fingers. The highest incidence of this "hand-stretching reflex" (HSR) is found in the age group of 4 to 5. Below this age more girls than boys are found with a positive HSR, whereas at the age of eleven girls are outnumbered by boys. Beyond this age the reflex disappears. Lefthandedness and leftsided reflex seem to correspond and vice versa. Lack of this reflex in the age group of 4 to 5 as well as persistence over the age of eleven seems to indicate retarded cerebral maturation.

Age Factors↗
PubMedDate not supplied

Bilateral asymmetry in conduction velocity in the efferent fibres of the median nerve andits relationship to handedness.

The conduction velocity in the efferent fibres of the median nerve has been compared in the right and left forelimbs of 38 human subjects. Six independent estimates were made for each limb. Estimates on the right and left limb of a subject were made at the same sitting. Conduction velocity was faster on the right side in the majority of right handed subjects; and on the left side in the majority of left handed subjects. The mean conduction velocity was greater on the right side in right handed subjects (P less than 0.02).

Adolescent↗
PubMedDate not supplied

[Reversal of "handedness" in callosotomized rats].

Effect of callosotomy on the transfer of preference of one of the forepaws in performance of instrumental reaction of reaching pieces of food from a narrow horizontal tube was studied in rats. The transfer was carried out by means of artificial impediment of food procuring with the preferred paw. There was no significant difference between intact and callosotomized rats in the rate of initial paw preference determination and in the rate of paw preference transfer. However, the degree of the paw preference transfer preservation was lower in the callosotomized rats as compared with intact ones. The role of interhemispheric inhibition in motor learning is discussed.

Animals↗