**Data files:** ----------- **A2_fTCD_Data.zip** - archive of raw fTCD data files (in .exp format) for all participants (001-038), tasks (A-F) and sessions (1-2). **Triallist.xlsx** - spreadsheet showing which trials were included/excluded for all participants, tasks and sessions. **Results_Session1.csv** - session 1 summary statistics from fTCD analysis for all participants and tasks. **Results_Session2.csv** - session 2 summary statistics from fTCD analysis for all participants and tasks. **A2_Behavioural_Data.csv** - spreadsheet of behavioural data for all participants, tasks and sessions. **A2_Participant_Info.csv** - spreadsheet of demographic data for all participants. **A2_fTCD_AveragedEpochData.zip** - archive of fTCD data for each participant and each task, preprocessed and averaged over all epochs. This data is used in the posthoc analysis performed for the reviewers to test whether CBFV was different between tasks A and F. See A2_Data_Dictionary.xlsx for more details. **all_LI_lat.csv** added April 2020 so this subset of data could be easily imported into script for analysing distributions of LIs.