14 DAY TRIAL // A human has what is named bi-symmetry: he/she possesses two hands, two legs, two eyes, two cerebral hemispheres which look equal.
But this is just an illusion.
Firstly, we have a leading hand, in most people the right one and, secondly, a leading eye, the right one in two thirds of the people, as researchers have found.
Moreover, the brain is highly functionally asymmetric: the left hemisphere (with the right-handers) is mostly linked to abstract-logical thinking and speech, the right hemisphere with image sensitivity.
Does the leading eye keenness affect how we perceive the visual information, for example, texts perception, on the left and on the right?
A team at the Institute of Cognitive Neurology of the Modern University for the Humanities experimented with all right-handed students, even if some were right eye leading, while the others left eye leading.
The subjects had to read a text on the PC screen, placed either on the right or on the left part of the screen, while their heads were oriented to the center (visual information from the left half-field of vision is addressed to the right hemisphere, and vice versa).
The "left-eyed" subjects read the text quicker when it was placed on the left, than when the text was placed on the right. The "right-eyed" ones presented no such differences.
In the "left-eyed" subjects reading the left-side text, the brain captured (in a single eye fixation on some text fragment) more information (higher "information capacity") than in case of reading the right-hand text.
This determines the speed of reading: the more symbols are perceived during one fixation, the faster a person reads. Also, during reading, the glance periodically returns to the already read word (linked to perception difficulty). The "left-eyed" subjects made less returns in left-sided texts than they did in the right-sided texts.
Most of the "left-eyed" persons displayed faster quick eye movements (saccades) to the left than to the right. In right-handed right-eyed person, the same left hemisphere controls both the leading hand and the leading right eye.
But for the left-eyed persons, the leading left eye is under the control of the right hemisphere, free from control over the leading hand's movements and works out better (e.g., read quicker on their left).
The leading eye should be taken into account for the production of some video-products, like training ones, as special objects (spoons, door-handles) are made for the left-handed.