In this study we examined whether electrical brain stimulation of the prefrontal cortex can change the size of the [attentional blink](http://www.scholarpedia.org/article/Attentional_blink). * __Project title__: _Effects of tDCS on the attentional blink revisited: A statistical evaluation of a replication attempt_ * __Project code__: AB-tDCS * __Authors__: Reteig, L.C., Newman, L.A., Ridderinkhof, K.R., & Slagter, H.A. * __Affiliation__: Department of Psychology, University of Amsterdam * __Year__: 2021 Don't hesitate to get in touch if you have any questions; find my contact details on [my personal website](https://lcreteig.github.io). # Resources __Project website__: <https://lcreteig.github.io/AB-tDCS> __Published paper__: [PLOS ONE](https://doi.org/10.1371/journal.pone.0262718) __Preprint__: [bioRxiv](https://doi.org/10.1101/2021.06.16.448698) __Behavioral data and other resources__: [Open Science Framework (OSF)](https://osf.io/y6hsf/) __EEG data__: [OpenNeuro](https://openneuro.org/datasets/ds001810) __Code__: [GitHub](https://github.com/lcreteig/AB-tDCS) # Project setup ## Directory structure After downloading everything from Github and/or the OSF, your directory structure should look like this (N.B. this is just a sketch; does not include every single file): ``` AB-tDCS │ AB-tDCS.Rproj | renv.lock │ └───data │ │ subject_info.csv │ │ tDCS_AE.csv │ │ AB-tDCS_study1.txt │ │ │ └───S01 │ │ │ AB_S01_1B_pre.txt │ │ │ AB_S01_1B_tDCS.txt │ │ │ AB_S01_1B_post.txt │ │ │ AB_S01_2D_pre.txt │ │ │ AB_S01_2D_tDCS.txt │ │ │ AB_S01_2D_post.txt │ │ │ └───S02 │ │ ... │ └───docs │ └───paper │ │ AB-tDCS_paper.Rmd │ │ AB-tDCS_paper_appendix.Rmd │ │ AB-tDCS.bib │ │ │ └───figures │ └───records │ │ participant_log.csv │ │ study_protocol.pdf │ │ tDCS_blinding.md │ │ │ └───questionnaires │ └───renv │ │ .gitignore │ │ activate.R │ │ settings.dcf │ └───site │ │ _site.yml_ │ │ build_site.R │ │ footer.html │ │ header.html │ │ styles.css │ └───src │ │ AB-tDCS_anodal-vs-cathodal.Rmd │ │ AB-tDCS_change-from-baseline.Rmd │ │ AB-tDCS_group.Rmd │ │ AB-tDCS_questionnaires.Rmd │ │ AB-tDCS_replication-analyses.Rmd │ │ │ └───func │ │ │ behavioral_analysis.R │ │ │ load_data.Rmd │ │ │ │ └───lib │ │ appendixCodeFunctionsJeffreys.R │ │ corr_change_baseline.R │ └───task │ AB_tDCS-EEG.exp │ mainTask.sce │ practice.sce ``` ## Descriptions * `AB-tDCS.Rproj`: Config file with options for the R project; also determines top-level folder. * `renv.lock`: Contains information on all the packages and their versions that were used for this project, and (along with the contents of the `renv/` folder) can be used to recreate the computational environment N.B. The following folders each have their own `README.md` (GitHub) and/or wiki page (OSF) with more detailed information on their contents. * `EEG/`: Metadata files and one example subject for an EEG dataset in [BIDS] format associated with this project (see [Resources]). * `data/`: All the behavioral and metadata collected during this project, as well as the task data from [London & Slagter (2021)](https://doi.org/10.1162/jocn_a_01679). * `docs/`: Holds the project website's files * `paper/`: `AB_tDCS_paper.Rmd` is the R Markdown source file for the paper; running it produces the rendered version on this website (`.html`) and the preprint (`.pdf`) * `records/`: Documentation, logbooks and protocols * `site/`: Source code for the website; runs the source code in `paper/` and `src/` to produce the website as in `docs/` * `src/`: All other analysis code used in the project * `task/`: Code for the experimental task used during data collection # Reproducibility 1. Make sure you've downloaded all the data and code and that they're placed in the `data`, `src` and `paper` folders (as outlined in the [Directory structure] section). To do so: - Download or clone the [GitHub](https://github.com/lcreteig/AB-tDCS) repository, using the big green "Code" button in the top right. - From the Open Science Framework, download the contents of the [Data](https://osf.io/rju7f/) and [Records](https://osf.io/ka3xp/) (optional) components. - Download `appendixCodeFunctionsJeffreys.R` per the instructions in `src/README`, and place in `src/lib`. 2. Open the `AB-tDCS.Rproj` file in [RStudio](https://www.rstudio.com/). 3. Run the command `renv::restore()` in the Console to install all the required packages in a separate library for this project. 4. If you're interested in recreating the paper, run the command `tinytex::install_tinytex()` to install a LaTeX distribution, which will enable you to build the pdf. > Or, if you just want to quickly play around with the code, simply click this link to create a remote RStudio session in your browser with [Binder](https://mybinder.org/): [](https://mybinder.org/v2/gh/lcreteig/AB-tDCS/master?urlpath=rstudio) > > This will already set everything up for you on the server, including all packages (and LaTeX) that the analysis code depends upon. Then, run the `.Rmd` notebooks in the `src` folder to reproduce the contents under the _Analyses_ tab on the project website. These contain all analyses (and their results) performed for this project. Run the `paper/AB-tDCS_paper.Rmd` notebook to reproduce all the results, figures and statistics, and the paper as under the _Paper_ tab on the project website, or in the preprint (see [Resources]). # Licensing All components of this project are open and under non-restrictive licenses: * The data are released to the public domain under a [CC0 1.0 Universal license](https://creativecommons.org/publicdomain/zero/1.0/) * The preprint and other written materials are licensed under a [CC-By Attribution 4.0 International license](https://creativecommons.org/licenses/by/4.0/) * The code is licensed under the [MIT license](https://tldrlegal.com/license/mit-license)