During the 20th century, which method of studying the brain led to a burst of knowledge about the nervous system?

Functional magnetic resonance imaging technique

Explanation:

FMRI is a technique to study the brain development for evolution.It works by perceiving the changes in blood oxygenation and stream that occur considering neural development – when a brain is increasingly unique it exhausts more oxygen and to fulfill this extended need circulation system augmentations to the dynamic locale. fMRI can be used to make commencement maps showing which parts of the brain are related with a particular mental system. As a brain  imaging technique FMRI has a couple of imperative central focuses:  

        1. It is non-meddlesome and does exclude radiation, making it okay for the subject.  

       2. It has grand spatial and incredible transient objectives.