Lexical Optimisation and Hardware-Timed Experiment Generation R package lexsync version 0.1.1 A cross-platform toolkit that unifies many-language lexical-corpus access, parallel multidimensional stimulus matching, deterministic pseudoword generation, counterbalancing and the automated generation of experiments from a declarative trial-event model, for 'PsychoPy', 'OpenSesame' and the browser ('jsPsych'). The laboratory targets bind electroencephalography onset triggers to the stimulus flip. It is the R member of a dual-language pair; a structurally identical 'Python' package is also provided. Several paradigms (factorial word contrasts, lexical decision, priming, self-paced reading and cued categorisation) are supported, and each design is accompanied by a machine- and human-readable materials datasheet for reproducibility. Software Depends: R (>= 4.0.0) Imports: readr, yaml, stringdist, stringi, jsonlite, digest, stats, tools, utils Suggests: testthat (>= 3.1.8), knitr, rmarkdown, spelling, clue, shiny, bslib, DT, zip Pablo Bernabeu <pcbernabeu@gmail.com> Comprehensive R Archive Network (CRAN) Pablo Bernabeu [aut, cre] (ORCID: <https://orcid.org/0000-0003-1083-2460>) MIT + file LICENSE (https://CRAN.R-project.org/package=lexsync/LICENSE) 2026-09-25 application/tgz https://CRAN.R-project.org/package=lexsync doi:10.32614/CRAN.package.lexsync en-GB