Based on Campbell’s text, one of the Insects swooped down and actually pressed its flat face against Shea’s for a brief moment and was then gone. The other insects left Shea alone after this encounter. The disappearance of the insect and the subsequent visions and historical information that seemed to appear in Shea’s mind indicates that there may have been either a merging of alien insect / human minds or the insect “downloaded” a large part of its history into Shea’s mind. In Shea’s testimony he states that the insects were not “strictly material – constructed of some alien matter which allow its atoms to exist conterminously with those of my body.”
The idea in the story seems to be that the Insects (obviously their resemblance to Earthly insects is purely coincidental) are of such exotic matter that they can occupy the same space as a human brain without detrimental physical effects on either side.
出处：https://lovecraftianscience.wordpress.com/2016/02/20/the-insects-from-shaggai-part-1-alien-matter/
夏盖虫的寄生不是实际意义上的寄生，而是
与人脑一同占据同一块空间。
夏盖虫寄生的过程是突然消失（disappear）。
它并不是打开了寄宿者的头颅爬进去，而是直接跨越了物理上的限制，
穿过头颅跑进去。
自己的肉体没有任何改变的情况下，头颅里是没有足够的空间除了大脑以外还住着一只夏盖虫的，
然而这人类确实是渐渐在精神上被侵蚀。
在相关模组里夏盖虫该技能也不是寄生，而是
融合（merge）。
结论：1. 拥有高智能又是活体还能三线思考（原著设定拥有六个脑叶）一般不会乖乖让你手术成功。
2. 夏盖虫在寄生/融合状态下是与地球物质不同的存在，有可能存在于另一个次元（？），无法直接干涉。
3. 就算可以取出，夏盖虫与大脑占据同一个空间的情况下，以现今外科技术相当于一同取出整个大脑。
