In step 5, the reason you could only see the afterimage in the uncovered eye is because it occurs at the point of input (the retina) and not the point of process (the brain).

• 在步骤五中，之所以只有被遮住的那只眼睛可以看到后像，是因为后像是在输入位置（视网膜）而非处理位置（大脑）产生。