Making Physiology Happen


Jan 2019: Hand Dominance

iWorx Systems, Inc.
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Featured Experiment

There have been a few studies conducted to know the differences in motor and sensory nerve conduction in right and left handed individuals. Most of these studies have shown somewhat conclusive evidence that sensory pathways are slightly faster in the dominant limb; but motor nerve velocity has shown little if any statistically significant differences.Hand with Electrodes

These studies include participants of different age and gender. Sensory and motor nerve conduction velocities of median nerve, and sometimes the ulnar nerve as well, of both the dominant and non-dominant limb.

Cerebral dominance, left vs right hemisphere, affects speech, handedness, facial recognition, and many other physiologic parameters. It is also thought that lateralization of nerve conduction velocity is expected. Nerve conduction velocity is only a physiological measure, and does not involve any cognitive processing of the speed with which the electrical impulses are transmitted along the peripheral nerve fibers. The conduction velocity of the nerve depends on anatomical factors such as fiber diameter, degree of myelination and internodal distance. Other factors such as age, temperature, height, gender and limb are also well known physiological variables affecting nerve conduction velocity.

The effect of handedness on nerve conduction has not been fully studied and this lab aims to draw some conclusion to this question: Does the dominant limb have both faster reaction time and faster nerve conduction velocity than the non-dominant limb?

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