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Amount of Asymmetry in Grasp Reflex Depends on the Grasp Reflex of the Left Hand in Human Neonates

Grasp-reflex strengths from right and left hands were measured in 33 human neonates. There was no significant correlation between right minus left grasp-reflex strength and grasp-reflex strength from the right hand. The grasp-reflex strength of the left hand was negatively linearly correlated with the right minus left grasp-reflex strength. It was suggested that the right brain may be the main determinant for the motor asymmetry in hands.