Byring R F, Haapasalo S, Salmi T
Department of Child Neurology, Children's Hospital, University of Helsinki, Helsinki, Finland.
Clin Neurophysiol. 2004 Nov;115(11):2574-83. doi: 10.1016/j.clinph.2004.05.026.
To find out whether 14-16-year-old pupils with visual perception disabilities have atypical EEG activation patterns during visual discrimination.
EEG correlation indices (EEGCIs), based on the waveform characteristics of two EEG signals, were used as measures of slow joint activation of cortical regions during visual discrimination in pupils with visual perception disabilities.
During visual discrimination low EEGCIs were seen between the left temporal and both parieto-occipital EEG channels in pupils with visual perception disabilities and in pupils with a poor occupational outcome. The pupils with low performance intelligence and those with difficulties in the visual discrimination task had low EEGCIs within the left hemisphere. The left hemispheric dominance of the findings is suggested to reflect the psychophysiology of the task since visual discrimination demands attention to details (local processing) and is thus supposed to be more strongly represented in the left hemisphere.
During visual discrimination, low EEGCIs were seen in the posterior and left hemispheric regions of pupils with disabilities in visual perception and visual discrimination and with a poor occupational outcome.
Low EEGCIs in posterior and left hemispheric regions during visual discrimination can to some extent be seen as neurophysiological markers for visual perception disabilities and a poor occupational outcome and imply an increased need for adjustment of the educational curriculum and a need for occupational guidance.
探究14 - 16岁有视觉感知障碍的学生在视觉辨别过程中是否具有非典型的脑电图激活模式。
基于两个脑电图信号的波形特征，脑电图相关指数（EEGCIs）被用作有视觉感知障碍学生在视觉辨别过程中皮质区域缓慢联合激活的测量指标。
在视觉辨别过程中，有视觉感知障碍的学生以及职业发展结果较差的学生，其左颞叶与双侧顶枕叶脑电图通道之间的EEGCIs较低。智力表现较差以及在视觉辨别任务中有困难的学生，其左脑半球内的EEGCIs较低。研究结果显示左脑半球占优势，这被认为反映了该任务的心理生理学特征，因为视觉辨别需要关注细节（局部处理），因此预计在左脑半球中有更强烈的体现。
在视觉辨别过程中，有视觉感知障碍、视觉辨别障碍且职业发展结果较差的学生，其后脑和左脑半球区域的EEGCIs较低。
视觉辨别过程中后脑和左脑半球区域的低EEGCIs在一定程度上可被视为视觉感知障碍和不良职业发展结果的神经生理学标志物，这意味着需要增加对教育课程的调整以及职业指导的需求。
