Final answer:
The goal of the Tau et al., (2013) paper cannot be determined from the information provided. Specificity and access to the full text are necessary to state the exact goal of the Tau et al., (2013) paper.
Step-by-step explanation:
The goal of the Tau et al., (2013) paper is not clearly provided in the information given, as the details referenced pertain to various different studies and authors. It is crucial to have the correct citation to provide an accurate goal of a specific study. Scientific papers, such as those published in PLoS ONE or Proceedings of the National Academy of Sciences (PNAS), typically aim to present new research findings, discuss the implications of the research, and contribute to the body of knowledge in fields like biology, chemistry, or medicine. As the information provided references a variety of studies, without specificity on Tau et al., (2013), it is challenging to deduce the exact goal of that particular paper. For precise information regarding the goal of Tau et al., (2013), one would need to have access to the full text of the publication.