The arrangement pattern of the retinula in the right, left compound eye and dorsal, ventral regions of the compound eye are the mirror image inversion.
家蝇的左复眼与右复限、复限的背区与腹区中，小网膜细胞呈镜像对称排列。
The result: when volunteer had direct eye contact with the face, there was an increase of activity in the ventral striatum, a central part of the brain that anticipates reward or pleasure.
结果是：如果实验者和照片上的人有过直接的目光交流，他们的前部纹状体活动频率就会增加。前部纹状体是大脑中产生成就感或者愉快情绪的重要部位。
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