Veraart C L
Bull Mem Acad R Med Belg. 1996;151(2):175-85.
The normal development of the visual system from birth until the end of the critical period involves, for the young subject to achieve a number of visual experiments. In cases of late blindness, the visual system has been normally developed, which is not the case when early blindness is considered where an abnormal cerebral organization exists. Accordingly, attempts to rehabilitate vision in the blind have to consider these discrepancies. When the invasive visual prosthesis acting by electrical stimulation of spared parts of the visual system is suitable in case of late blindness, sensory substitution prostheses coding visual information into signals addressing an intact sensory modality seems devoted to cases of early blindness. This later approach takes into account the early blind's brain specific organization, whose undeveloped occipital cortex has been shown to be involved in the sensory substitution process using positron emission tomography.
从出生到关键期结束，视觉系统的正常发育要求年轻个体进行一系列视觉体验。在迟发性失明的情况下，视觉系统已正常发育，而早期失明则不然，早期失明存在大脑组织异常的情况。因此，盲人视力恢复的尝试必须考虑到这些差异。通过电刺激视觉系统剩余部分起作用的侵入性视觉假体适用于迟发性失明，而将视觉信息编码为针对完整感觉模态的信号的感觉替代假体似乎适用于早期失明的情况。后一种方法考虑到了早期盲人的大脑特定组织，正电子发射断层扫描显示，其未发育的枕叶皮质参与了感觉替代过程。
