Prior to technological advances in neuroimaging, like functional MRIs, doctors couldn't see what was happening in the brain and observe what areas lit up with various stimuli.

在神经影像学技术进步（如功能性核磁共振成像）之前，医生无法看到大脑中发生了什么， 也无法观察哪些区域受到各种刺激而亮起。