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THOUGHTS 2
06/02/2019
LATERALIZATION AND CEREBRAL HEMISPHERIC DOMINANCE
From three to four years of age begins to appear in the human being a lateral preference that is completed around eight years to take us to the percentage statistics of 64 pure right handed, 32 ambidextrous and only 4 pure left handed. That is, only 4% of humanity is totally left-handed <2).
The lateralization is not always homogeneous (eye, ear, hand and foot), but it can be heterogeneous, that is, it can have combined lateralisations. The diagnosis of lateralization is made by applying batteries of psychological tests and mediantes
the observation of the functioning of eyes, ears, hands, arms, legs and feet.
There are simple tests like seeing through a monocle, hearing the ticking of a clock, cutting with scissors, crossing hands and arms, clapping, crossing your feet, putting on pants, kicking, jumping,
kneel down. These tests show the preference to use right or left organs or limbs (3).
The dominant cerebral hemisphere is larger and heavier. In most human beings, including lefties, the left one is the dominant hemisphere. The left hemisphere is logical, symbolic, mathematical, verbal, analytical, abstract, reasoning; it predominates in language. Process the right eye and ear information and govern the
motor activity of the right side of the body (4) <5).
The right hemisphere, dominant in some lefties, is instead spatial, intuitive, nonverbal, synthetic, emotional, musical, concrete, artistic; predominates in visual functions and
motor It processes the information of the left eye and the ear and governs the motor activity of the left hemicuerpo (4) (5).
In explorations with «dichotic listening» (in which simultaneous information is provided for both ears) it has been found that the right ear (left hemisphere) perceives
better syllables, words and figures while the left ear (right hemisphere) captures better melodies and noises.
Rev Colomb Psiquiatr Vol. XXVIII, No. 2, 1999
The world of the southpaw
167
From three to four years of age begins to appear in the human being a lateral preference that is completed around eight years to take us to the percentage statistics of 64 pure right handed, 32 ambidextrous and only 4 pure left handed. That is, only 4% of humanity is totally left-handed <2).
The lateralization is not always homogeneous (eye, ear, hand and foot), but it can be heterogeneous, that is, it can have combined lateralisations. The diagnosis of lateralization is made by applying batteries of psychological tests and mediantes
the observation of the functioning of eyes, ears, hands, arms, legs and feet.
There are simple tests like seeing through a monocle, hearing the ticking of a clock, cutting with scissors, crossing hands and arms, clapping, crossing your feet, putting on pants, kicking, jumping,
kneel down. These tests show the preference to use right or left organs or limbs (3).
The dominant cerebral hemisphere is larger and heavier. In most human beings, including lefties, the left one is the dominant hemisphere. The left hemisphere is logical, symbolic, mathematical, verbal, analytical, abstract, reasoning; it predominates in language. Process the right eye and ear information and govern the
motor activity of the right side of the body (4) <5).
The right hemisphere, dominant in some lefties, is instead spatial, intuitive, nonverbal, synthetic, emotional, musical, concrete, artistic; predominates in visual functions and
motor It processes the information of the left eye and the ear and governs the motor activity of the left hemicuerpo (4) (5).
In explorations with «dichotic listening» (in which simultaneous information is provided for both ears) it has been found that the right ear (left hemisphere) perceives
better syllables, words and figures while the left ear (right hemisphere) captures better melodies and noises.
Rev Colomb Psiquiatr Vol. XXVIII, No. 2, 1999
The world of the southpaw
167
