## General Information ## The methodology of this study consists of 5 steps. 1. The behavioral data from merged auditory-visual oddball (dual task) in Standard-Target and Target-Target conditions are compared. 2. P300 ERP data has first been analyzed based on previous studies' suggestions (Hypothesis-driven; repeated measure ANOVA with Bonferroni correction). Moreover, to explore changes in other event-related potentials in this task design, exploratory analysis with appropriate multiple comparison corrections (false discovery rate )and strict p values has been done (p<0.001) 3. Alpha event-related de-synchronization (ERD) changes were first analyzed based on study's hypothesis (Hypothesis-driven). Subsequently, in order to explore significant changes in other frequency bands and time courses, exploratory analysis based on permutation testing and pixel-based multiple comparison correction has been conducted. 4. P300 and alpha-ERD sources were estimated using the LORETA solution. For alpha-ERD due to the fact that a relatively large number of voxels were marked as significant, only the top 10 percent of voxels with the highest activation values were specified as ROI for subsequent effective connectivity analysis (For details, please see "Results" section in the main text). 5. Effective connectivity between sources of P300 and alpha-ERD was estimated. First, waves from ROI of interest were extracted using BrainStorm toolbox, second, granger based causality was computed using SIFT (Source Information Flow Toolbox). ## Guide through Functions and Data ## In each section, a text file named "readme.txt" has provided necessary details to track the flow of information processing used in this project as well as information about most matrices of data uploaded here. Moreover, when needed functions have been provided with informative comments. ## Disclaimer ## Unfortunately, due to the excessive volume of EEG data for 23 subjects and 4 conditions (approximately 7 gigabytes), we were unable to upload the EEG data that were used for ERP exploratory analysis as well as the raw EEG files from which ROI waves were extracted from BrainStorm. To discuss possible routes of sharing data, please contact the corresponding author.
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