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Left-handedness and mirror writingFeatured science projectScience project video


This science fair project was done to compare the ability of left-handed persons and right-handed persons in mirror writing. The experiment was done by comparing the time taken by left-handed and right-handed individuals to write some text in "mirror language".


Left-handers can mirror write more effectively and quickly than right-handers.

Scientific Terms

Hereditary, brain, nerves


Left Handedness

A left-hander is a person who prefers to use his left-hand over his right to perform daily tasks. About 10% of the world's population consists of left-handed persons. Left handedness is a hereditary trait passed down from parents. There is usually more than one left-hander in the family. Left-handers usually have a parent, an uncle or an aunt who is also a left-hander.
Hand dominance may not be directly related to brain dominance. There are opposing views and a lack of substantiated scientific evidence on this.

It is believed by some scientists that left handed and right handed persons are controlled by their different sides of the brain. They believe that a right handed person is controlled by the left side of the brain whereas the left handed person is controlled by the right side of their brain, and that this happens because of the way that the nerves from our brains cross to opposite sides of our body at the neck region. However, hand dominance may not be directly related to brain dominance. There exist opposing views within the scientific community.

Mirror writing

Mirror writing is formed by writing in the opposite direction to what is considered normal writing in a given language. What is written in "mirror writing" is the exact mirror image of normal text. Mirror writing can be read through the reflection of a mirror.

There are usually more left-handed mirror writers than right-handed mirror writers probably because left-handers tend to have "language centers" in both halves of their brain. This causes them to read and write backwards quite comfortably.

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Complexity level:
Project cost ($):
Time required:
1 hour to prepare, 1 day for observation
Material availability:
Easily found. Ensure that your mirrors are not too large or small.
Safety concerns:

Handle mirrors with care to prevent injury