ABSTRACT
Objective The pattern and morphological features of the intraparietal sulcus(IPS) were explored on MRI in vivo using 3D visualization method,so as to provide anatomical basis for the brain function studies of the parietal lobe as well as the diagnosis and treatment of the related diseases. Methods Totally 107 right-handed Chinese subjects were selected and scanned to acquire high quality MR images of the brains using 3. 0T high-resolution magnetic resonance imaging scanner. The 3D anatomical model of the IPS was reconstructed by BrainVISA, then the morphological patterns of the IPS were observed and analyzed. Results There were three types of the IPS: Continuous type, two segments type and three segments type. The gyri which separate different segments were either visible on the brain surface or buried within the sulcus. In the left brain, the continuous type was in dominant(56. 07%). while the two segments type was the most common type in the right brain(58. 49%) ,and the morphology of the IPS had significant asymmetries in both sides(lJ0. 05). Conclusion The morphology of the IPS is very complicated and it has three main types. There are obvious bilateral differences within the IPS.
ABSTRACT
El fenómeno de la ilusión de la mano falsa (IMF) se ha propuesto como un diseño que permite discriminar procesos perceptuales a partir de entradas sensoriales multimodales. Se han reportado varias modificaciones y variables que podrían afectar la generación del fenómeno. Este estudio se planteó bajo un diseño descriptivo-correlacional del fenómeno. Se realizó el procedimiento en jóvenes (16-48 años M = 20.86 años, DE = 4.4) colombianos para replicar el fenómeno de IMF. Los sujetos se dividieron al azar en dos grupos que diferían en el tipo de estimulación (sincrónica y desincronizada). La identificación de la IMF se realizó mediante la escala reportada en múltiples estudios, mostrando que en algunas variables como la estimulación se presentaba una diferencia en el reporte de IMF (P2. X² = 5.856: p < 0.05; P3. X² = 6.655: p <0.01 y P7(X² = 4.764: p < 0.05). Otras variables como sexo y dominancia manual mostraron algunas diferencias. La escala presenta una consistencia interna aceptable (α = 0.8). Los resultados de la IMF son similares a algunos estudios pero con puntuaciones menores que en los estudios iniciales, la diferencia en cuanto al género en tareas perceptuales podría explicar gran parte de los resultados.
The Rubber Hand Illusion (RHI) has been proposed as a design which allows to discriminate perceptual processes based on multimodal sensory inputs. Several modifications and variables have been reported that could affect the generation of the phenomenon. This study was conducted using a descriptive correlational design of this phenomenon. The procedure was conducted with young Colombian individuals (16-48 years-M = 20.86 years, SD = 4.4), seeking to replicate the RHI. The subjects were randomly divided into two groups that differed in type of stimulation (synchronised and unsynchronised). Identification of the RHI was performed using the scale reported in multiple studies, showing that the RHI report had differences in some variables such as stimulation (P2. X² = 5.856: p <.05; P3. X² = 6.655: p <.01 y P7 (X² = 4.764: p <.05). Other variables, such as gender and handedness, also showed some differences. The scale has an acceptable internal consistency ( X= 0.8). The results of the RHI are similar to some studies, but with lower scores than in the initial studies. The difference in gender in perceptual tasks could explain most of the results.