At three millimeters, however, the cortex is five times thicker than the retina, and morphing all six cortical layers requires integrated circuits with many more transistors per unit area.

• 然而，皮质厚约三公厘，是视网膜的五倍厚，要模铸所有六层皮质细胞，需要在积体电路的单位面积上，增加更多电晶体。