This is an OSF site for Meier (2018/in press), "Is There a Positive Association between Working Memory Capacity and Mind Wandering in a Low-Demand Breathing Task? A Preregistered Replication of Levinson, Smallwood, and Davidson (2012)" Here you can find: (a) Preregistration (also available at: https://aspredicted.org/kw8a5.pdf (b) Supplemental Materials: Tables (Descriptive statistics before [Table S1] and after subject exclusions [Table S2]; Correlation matrix before subject exclusions [Table S3]) and write-up of analyses conducted on non-transformed span scores. (c) 8 datafiles from which I conducted analyses. There are 2 .txt files for each of the 3 tasks in the study (breathing.txt, breath add.txt, BRospan.txt, BRsspan.txt, opan add.txt, sspan add.txt). These files are the merged non-aggregated files that are output by E-prime. The .RMD file makes use of these text files (and assigns reasonable variable names). The files "LSD aggregated all in.csv" and "LSD aggregated exclusions out.csv" are datafiles of aggregated between subject measures that were used in inferential analyses. "LSD aggregated all in.csv" contains aggregated subject data before subjects were excluded based on feedback from experimenters and "LSD aggregated exclusions out.csv". A variable key for these aggregated files can be found here ("LSD Rep aggregated_variable key.csv"). (d)An R mardkown file (.RMD) with analysis code for all analyses (e)a HTML version of the .RMD file. This file can be viewed in any standard web browser. All analysis code and results from that code (and some limited annotation) are visible. (f)A variable key for these aggregated files can be found here ("LSD Rep aggregated_variable key.csv").