回答
長い文章のごく一部だけを抜き出して解説してみろと言われましても、何だかよく分からないというのが普通なのですよ。
下に原文を貼っておきましたが、「同じようなフェイクニュースなどを読ませられた人達がどのように同じような(意思)決定をするようになるのかについて更に深く掘り下げるために」というような意味になるようですね:
Political leanings also influence sharing. A 2019 Science study, from researchers at Northeastern and elsewhere, showed that neither the left nor the right has a monopoly on sharing fake news; mostly people are just choosing content that fits their ideologies.
To dig deeper still into sharing decisions, Rand and colleagues developed a two-part study. In the first, they assembled a sample group of 853 adults and first asked them to take a pair of tests. One, known as the Cognitive Reflection Test (CRT), measures basic reasoning processes. The other measured basic science knowledge. The sample pool was then divided in half. Both halves were shown the same series of 30 headlines—15 false and 15 true—about COVID-19, but they were instructed to do two different things. One group was asked to determine the accuracy of the headlines. The other was asked if they would be inclined to share the headlines.
https://bluesyemre.com/2020/08/11/information-behavior-during-the-infodemic-ideas-for-academiclibrarians/