Code repository for data analysis used in the study A role for preparatory midfrontal theta in autism as revealed by a high executive load brain–computer interface reverse spelling task.

Language: MATLAB R2018b

Folders

Behavioural and BCI feasibility analysis (Feasibility_analysis)

• partErrorRate_mixedModel.m: Export data to a file to compare participants' error rate between groups considering cognitive load and practice/learning effects.
• BCIsystem_errorRate.m: Export data to a file to compare BCI system error rate between groups considering practice/learning effects.

EEG preprocessing (EEG_preprocessing)

• eeg_preprocessing.m: EEG data pre-processing. Requirements: EEGLAB.

EEG data analysis (EEG_data_analysis)

• preResponse_epochs_topoPlots.m: Create EEG epochs and generate topographic maps of power distribution during pre-response.
• feedbackLetter_epochs_topoPlots.m: Create EEG epochs and generate topographic maps of power distribution following response feedback.
• preResponse_mixedModel.m: Export data to compare frequency power during pre-response between groups considering performance, cognitive load, practice/learning effects and distinct task periods.
• feedbackLetter_mixedModel.m: Export data to compare frequency power during pre-response between groups considering performance and practice/learning effects.

Statistical analysis (stats_SPSS)

• partErrorRate_stats.sps: Statistical analysis to test the effects of group, cognitive load, practice and respective interactions on error rate.

• preResponse_thetaFCz_stats.sps: Statistical analysis to test the effects of group, performance, cognitive load, pre-response period, practice and interactions on pre-response FCz theta power.

• preResponse_thetaPOz_stats.sps: Statistical analysis to test the effects of group, performance, cognitive load, pre-response period, practice and interactions on pre-response POz theta power.

• preResponse_alphaFCz_stats.sps: Statistical analysis to test the effects of group, performance, cognitive load, pre-response period, practice and interactions on pre-response FCz alpha power.

• preResponse_alphaPOz_stats.sps: Statistical analysis to test the effects of group, performance, cognitive load, pre-response period, practice and interactions on pre-response POz alpha power.

• feedback_thetaFCz_stats.sps: Statistical analysis to test the effects of group, performance, practice and respective interactions on FCz theta power following feedback.

• feedback_thetaPOz_stats.sps: Statistical analysis to test the effects of group, performance, practice and respective interactions on POz theta power following feedback.

• feedback_alphaFCz_stats.sps: Statistical analysis to test the effects of group, performance, practice and respective interactions on FCz alpha power following feedback.

• feedback_alphaPOz_stats.sps: Statistical analysis to test the effects of group, performance, practice and respective interactions on POz alpha power following feedback.

  Requirements: SPSS V27.