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Título del libro: Brain Mapping And Diseases
Título del capítulo: Handedness of children determines preferential facial and eye movements related to hemispheric specialization

Autores UNAM:
HECTOR ADRIAN POBLANO LUNA;
Autores externos:

Idioma:
Inglés
Año de publicación:
2011
Palabras clave:

Brain specialization; Handedness; Haptic perception; Language; Left and right hemispheres; Visual perception


Resumen:

Background: Despite repeated demonstrations of asymmetries in several brainfunctions, the biological bases of such asymmetries have remained obscure The objectiveof study was to investigate development of lateralized facial and eye movements evokedby hemispheric stimulation in right-handed and left-handed children.Methods: Fifty children were tested according to handedness by four tests: I. Monosyllabicnon-sense words, II. Tri-syllabic sense words, III. Visual field occlusion by blackwall, and presentation of geometric objects to both hands separatelly, IV. Left eye and thetemporal half visual field of the right eye occlusion with special goggles, afterwardsasking children to assemble a three-piece puzzle; same tasks were performedcontralaterally.Results: Right-handed children showed higher percentage of eye movements to rightside when stimulated by tri-syllabic words, while left-handed children shown higherpercentages of eyes movements to left side when stimulated by tri-syllabic words. Lefthandedchildren spent more time in recognizing mono-syllabic words. Hand lateralitycorrelated with tri-syllabic word recognition performance. Age contributed to lateralitydevelopment in nearly all cases, except in second test.Conclusions: Eye and facial movements were found to be related to left- and righthandpreference and specialization for language development, as well as visual, hapticperception and recognition in an age-dependent fashion in a very complex processHandedness, Language, Haptic perception, Visual perception, Left and righthemispheres, Brain specialization. © 2011 Nova Science Publishers, Inc. All rights reserved.


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