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Título del libro: Handedness: Theories, Genetics And Psychology
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:
2012
Palabras clave:

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


Resumen:

Background: Despite repeated demonstrations of asymmetries in several brain functions, the biological bases of such asymmetries have remained obscure The objective of study was to investigate development of lateralized facial and eye movements evoked by hemispheric stimulation in right-handed and left-handed children. Methods: Fifty children were tested according to handedness by four tests: I. Mono-syllabic non-sense words, II. Tri-syllabic sense words, III. Visual field occlusion by black wall, and presentation of geometric objects to both hands separatelly, IV. Left eye and the temporal half visual field of the right eye occlusion with special goggles, afterwards asking children to assemble a three-piece puzzle; same tasks were performed contralaterally. Results: Right-handed children showed higher percentage of eye movements to right side when stimulated by tri-syllabic words, while left-handed children shown higher percentages of eyes movements to left side when stimulated by tri-syllabic words. Left-handed children spent more time in recognizing mono-syllabic words. Hand lateralitycorrelated with tri-syllabic word recognition performance. Age contributed to laterality development in nearly all cases, except in second test. Conclusions: Eye and facial movements were found to be related to left- and right-hand preference and specialization for language development, as well as visual, haptic perception and recognition in an age-dependent fashion in a very complex process. © 2012 by Nova Science Publishers, Inc. All rights reserved.


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