Basically what I'm interested in is whether there is any research on whether the linguistic similarity of two languages that are learnt simultaneously contributes to the effectiveness of learning them. For instance, let's say the following hypothesis is formulated: when one learns two closely related languages at one time it's less efficient because they mix up similar vocabulary and confuse syntax and grammar. Let's say we state another hypothesis: learning related languages in parallel speed up learning.

Just to protect this question of being closed as dup: this question asks about the studying of similar languages - the author even claims that they are "not interested in the general study of multiple languages, but specifically those which are similar" - and the only passage related to my question is that one blogger strongly advises against learning related languages in parallel - but this claim is not backed up by any scientific research.

This question is about learning similar languages but not necessarily in parallel. It's also not about comparison of learning two similar languages in parallel compared to learning typologically very different languages in parallel.

  • Could you please clarify whether you are interested in the effect on learning those languages in parallel or learning them one after the other? – Tsundoku Jul 18 '20 at 21:15
  • @Tsundoku in parallel, simultaneously (as it was mentioned in the title you've edited :P) – shabunc Jul 18 '20 at 21:21
  • We have old question languagelearning.stackexchange.com/questions/1/… about benefits of learning two languages in parallel. (suboptimal). IMHO result is the same if languages are related – Peter M. - stands for Monica Jul 23 '20 at 4:31

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