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Article History

Received: 8 February 2018

Accepted: 25 May 2018

First Online: 19 June 2018

Authors’ information

: TG is a senior lecturer at the Department of Linguistics, Stockholm University and co-leader of the project. HLT is a professor at the Department of Child and Youth Studies, Stockholm University and PI of the project. TH is post doctor at the Department of Psychology, Stockholm University. ST is a PhD Candidate at the Department of Linguistics, Stockholm University and employed by the project. PK is a PhD Candidate at the Psychology Department, Stockholm University as well as a lab technician at the Department of Linguistics, Stockholm University. SF is a senior lecturer at the department of Child and Youth Studies, Stockholm University. SK is a post doctor at the department of Child and Youth Studies, Stockholm University. AP is an associate professor at the department of Child and Youth Studies, Stockholm University.

: All participating adults and parents of participating children have signed an informed consent (Additional file) allowing for project members to publish results on group-level. No analyses of individual children have been performed and individual scores cannot be released, not even to parents. All data is coded and depersonalized. All data is kept in accordance with the regulations of data handling Swedish Research Council. The project was controlled and ethically approved by The Regional Ethics BoardDNR nr: 2015/1664–31/5.

: The interventions employed subscription materials from NIH Toolboxas well as a Maths application developed by Stanford and Lund Universities. None of these had control over the data or the design of the study but do retain the right to see the results of the data analysis. The authors declare that they have no competing interests.

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