ABSTRACT
El procesamiento visoespacial es una función adaptativa del organismo que permite su interacción con los elementos que se encuentran en su medio ambiente. Se considera una función superior, ya que involucra sistemas de reconocimiento y de memoria, entre otros. Hasta el momento se ha descrito la participación de diversas estructuras cerebrales en el procesamiento de información visoespacial, por ejemplo, tradicionalmente se considera una especialización funcional por parte del hemisferio derecho; sin embargo aún existen muchas controversias con respecto a la participación de diversas áreas cerebrales tanto ipsilaterales como contralaterales en estás funciones visoespaciales. En el presente trabajo se discute el papel de la comunicación interhemisferica, y específicamente del papel que juega el cuerpo calloso en el procesamiento visoespacial. Se inicia con una descripción de las vías de procesamiento visoespacial desde el ojo hasta la corteza V1 y las conexiones anatómicas funcionales que se establecen a partir de ésta. Posteriormente se resume la estructura-función del cuerpo calloso y se revisan los trabajos que han reportado relaciones entre éste y la función visoespacial. Por último, se revisan algunas de las patologías neurológicas que cursan con afectación del cuerpo calloso y que se ha reportado en la literatura que afectan a la función visoespacial...
The visuospatial processing is an adaptive function of the organism that allows it to interact with the elements that are in their environment. It is considered a high-order function as it involves recognition systems, memory, among others. So far described the participation of various brain structures in processing visuospatial information, for example, is traditionally considered a functional specialization by the right hemisphere, but there are still many controversies regarding the participation of various brain areas, both ipsilateral and contralateral in the visuospatial functions. In this paper we discuss the role of interhemispheric communication, and specifically the role of the corpus callosum in visuospatial processing. It begins with a description of visuospatial processing pathways from the eye to the cortex V1 and the anatomical-functional connections are established from this. Later summarizes the structure-function of the corpus callosum and reviews the studies that have reported relationships between this and visuospatial function. Finally we review some of the neurological disorders that present with involvement of the corpus callosum and it has been reported in the literature that affect visuospatial function...
Subject(s)
Humans , Corpus Callosum/physiology , Functional Laterality , Visual Perception/physiology , Spatial Processing/physiologyABSTRACT
The purpose of the present study was to investigate the relationship between Korean language-specific dysgraphia and unilateral spatial neglect in 31 right brain stroke patients. All patients were tested for writing errors in spontaneous writing, dictation, and copying tests. The dysgraphia was classified into visuospatial omission, visuospatial destruction, syllabic tilting, stroke omission, stroke addition, and stroke tilting. Twenty-three (77.4%) of the 31 patients made dysgraphia and 18 (58.1%) demonstrated unilateral spatial neglect. The visuospatial omission was the most common dysgraphia followed by stroke addition and omission errors. The highest number of errors was made in the copying and the least was in the spontaneous writing test. Patients with unilateral spatial neglect made a significantly higher number of dysgraphia in the copying test than those without. We identified specific dysgraphia features such as a right side space omission and a vertical stroke addition in Korean right brain stroke patients. In conclusion, unilateral spatial neglect influences copy writing system of Korean language in patients with right brain stroke.
Subject(s)
Adolescent , Adult , Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Young Adult , Agraphia/pathology , Brain/pathology , Brain Injuries/pathology , Language , Neuropsychological Tests , Perceptual Disorders/pathology , Republic of Korea , Spatial Processing/physiology , Stroke/pathology , WritingABSTRACT
The purpose of the present study was to investigate the relationship between Korean language-specific dysgraphia and unilateral spatial neglect in 31 right brain stroke patients. All patients were tested for writing errors in spontaneous writing, dictation, and copying tests. The dysgraphia was classified into visuospatial omission, visuospatial destruction, syllabic tilting, stroke omission, stroke addition, and stroke tilting. Twenty-three (77.4%) of the 31 patients made dysgraphia and 18 (58.1%) demonstrated unilateral spatial neglect. The visuospatial omission was the most common dysgraphia followed by stroke addition and omission errors. The highest number of errors was made in the copying and the least was in the spontaneous writing test. Patients with unilateral spatial neglect made a significantly higher number of dysgraphia in the copying test than those without. We identified specific dysgraphia features such as a right side space omission and a vertical stroke addition in Korean right brain stroke patients. In conclusion, unilateral spatial neglect influences copy writing system of Korean language in patients with right brain stroke.