translation.en: So this is how close your mental experience and the activity of the neurons in the retina, which is a part of the brain located in the eyeball, or, for that matter, a sheet of visual cortex.
translation.zh: 这说明 你的精神体验 和视网膜中神经元的活动关系有多密切， 视网膜是位于眼球中的大脑的一部分， 或者，就此而论，视觉皮层。