Appendix 5 Addendum Amsterdam Neuroscience co-author analyses

These analyses, made by the CWTS in Leiden, show the internal cooperation within the Amsterdam Neuroscience research institute and map out the connections between the research programs of the institute. Three analyses were made: a network analysis to map out cooperation, a network of Principal Investigators from the nine different research programs and a keyword analysis to visualize the research focus.

Explanation and background of the network analyses

Based on the metadata of publications from sources such as Web of Science, Scopus or Pubmed, networks can be visualized on the basis of co-author relationships. For these analyses, the publication set of Amsterdam Neuroscience over the years 2016-2021 was used. For this purpose, the institute has provided an overview of publications with corresponding digital object identifiers (doi’s). Due to a reorganization of the research programs in 2019, which lead to the disappearance of two programs and the creation of two new ones, two different datasets were provided, one corresponding to publications from 2016-2018 and a second one corresponding to 2019-2021. Network analyses were performed separately for both periods. A CWTS enhanced version of the Web of Science core collection has been used in this project. This bibliographic data source provides a clear view of the international scholarly communication, though it does not capture all scholarly output. In the visualizations, the sphere size is a measure of the number of publications of an author compared to other authors. The lines between the spheres reflect co-author relationships within the analysis period. The colors reflect groups of authors who often publish together and are a proxy for research groups.

To correct for author name variants, a thesaurus was constructed. Next, a number of choices have to be made in the visualization of the network, such as the threshold for the number of publications per author to appear in the network and whether or not to include publications with large author lists in the network. The visualizations have limitations. For example, not all spheres in the network can be displayed by name. This means that in the network visualizations sometimes names that might have been expected are not shown. In the various visualizations over time, an attempt was made to show as many different researchers as possible. An interactive presentation of these networks can be found online in the URLs located below the figures, which link to the VOSviewer software. The left side panel of VOSviewer allows for different possibilities in visualizing the data, such as adjusting the sphere size, the amounts of links between spheres or the colors of the clusters.

2016-2018 2019-2021

Interactive map in VOSviewer 2016-2018 Interactive map in VOSviewer 2019-2021

Figure 5.1 Amsterdam Neuroscience network in the two periods 2016-2018 and 2019-2021. Network of Amsterdam Neuroscience researchers and how they collaborate. The network shows authors from Amsterdam Neuroscience, but also includes the most frequent co-authors from outside the institute (authors with minimal 15 publications are shown, publications with more than 50 authors excluded, color coding is cluster based and arbitrary).

2016-2018 2019-2021

BI

SNN

CMM

CTG

ND

NII

NDIS

CIA

MAPSS

Brain Imaging | Systems & Network Neuroscience | Cellular & Molecular Mechanisms | Complex Trait Genetics | Neurodegeneration | Neuroinfection & Inflamation | Neurovascular Disorders | Compulsivity, Impulsivity & Attention | Mood, Anxiety, Psychosis, Stress & Sleep

Interactive map in VOSviewer 2016-2018 Interactive map in VOSviewer 2019-2021

Figure 5.2 Amsterdam Neuroscience Principal Investigators network in the two periods 2016-2018 and 2019-2021. The network plot shows that 97,5% of all Principal Investigators of Amsterdam Neuroscience have substantial co-authorships and that there are many co-authors affiliated with different research programs of the institute. The color coding is based on the classification by research program.

Interactive map in VOSviewer 2016-2021

Figure 5.3 Amsterdam Neuroscience keywords network for the whole period 2016-2021. This network gives an impression of the most important research topics within the institute.