Brain Mapping and Sensory Motor Integration, Institute of Psychiatry of the Federal University of Rio de Janeiro (IPUB/UFRJ), Brazil; Institute of Applied Neuroscience (IAN), Rio de Janeiro, Brazil.
Brain Res Bull. 2012 Jan 4;87(1):103-8. doi: 10.1016/j.brainresbull.2011.10.013. Epub 2011 Oct 25.
The saccadic paradigm has been used to investigate specific cortical networks involving visuospatial attention. We examined whether asymmetry in theta and beta band differentiates the role of the hemispheres during the execution of two different prosacadic conditions: a fixed condition, where the stimulus was presented at the same location; and a random condition, where the stimulus was unpredictable. Twelve healthy volunteers (3 male; mean age: 26.25) performed the task while their brain activity pattern was recorded using quantitative electroencephalography. We did not find any significant difference for beta, slow- and fast-alpha frequencies for the pairs of electrodes analyzed. The results for theta band showed a superiority of the left hemisphere in the frontal region when responding to the random condition on the right, which is related to the planning and selection of responses, and also a greater activation of the right hemisphere during the random condition, in the occipital region, related to the identification and recognition of patterns. These results indicate that asymmetries in the premotor area and the occipital cortex differentiate memory- and stimulus-driven tasks.
扫视范式被用于研究涉及视空间注意的特定皮质网络。我们研究了在执行两种不同的预眼跳条件时，θ波和β波的不对称性是否区分了大脑半球的作用：一种是固定条件，刺激出现在相同位置；另一种是随机条件，刺激是不可预测的。12 名健康志愿者（3 名男性；平均年龄：26.25 岁）在执行任务的同时，他们的大脑活动模式被定量脑电图记录下来。我们没有发现分析的电极对之间β波、慢α波和快α波的任何显著差异。θ波的结果显示，当对右侧的随机条件做出反应时，左半球在前额区域具有优势，这与反应的计划和选择有关，并且在随机条件下，右半球在枕叶区域的活动更大，与模式的识别和识别有关。这些结果表明，运动前区和枕叶皮层的不对称性区分了记忆和刺激驱动的任务。
