The ability to recognize sounds and identify their location is possible thanks to the auditory system. That’s comprised of two main parts: the ear, and the brain. The ear’s task is to convert sound energy into neural signals; the brain's is to receive and process the information those signals contain. To understand how that works, Douglas L. Oliver follows a sound on its journey into the ear.

由于听觉系统的存在，人们能够识别声音并确定其位置。它由两个主要部分组成：耳朵和大脑。耳朵的任务是将声音能量转化为神经信号；大脑的任务是接收和处理这些信号所包含的信息。为了了解其工作原理，道格拉斯-L-奥利弗跟随声音进入耳朵的旅程。