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. 2023 Mar 8;17:1109510. doi: 10.3389/fnins.2023.1109510

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Copyright © 2023 Zhang, Zhang, Ma, Zhang, Wei, Wang and Tang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Collaboration network of countries or regions engaged in FD research. The network is made up of nodes, each representing a country or region, and their size represents the number of publications produced by that country or region. A thicker curved line connecting nodes indicates a more frequent co-occurrence, since co-occurrence represents a collaborative relationship. There is no collaboration when a node lacks any connections. A node with a high betweenness centrality (>0.1) (that is, those that are linked to more than 10% of the other nodes) possess significant power over other nodes due to the increased flow of information via it. Furthermore, the presence of a purple rim denotes a high degree of betweenness centrality. The presence of a red tree ring indicates a high level of scholarly activity, indicated by a citation burst. The burst associated with a particular node is proportional to the thickness of its red tree ring.