camcan-core_fmri_smt's Introduction

CamCAN_fMRI-SMT_events

This repository logs changes (2022 onwards) for Matlab analysis code of Cam-CAN's fMRI SMT task.
Specifically, new appended code (see git commit history) generates new event files (to match Cam-CAN MEG SMT task) that include event onsets for button presses (i.e. Reaction Times; RTs).

Example Output

sub-<CCID>_ses-smt_task-smt_events.tsv

onset	duration	trial_type
4.13	0.3	AudVid1200
4.41	0	button
6.147	0.3	AudVid300
6.428	0	button
...	...	...
504.063	0.3	AudVid300
504.323	0	button

Note on Missing RTs

RTs that are missing (0ms difference between trial onset & RT) have already been removed using the utilities clean_events.m function:

%% Purpose: Remove any 0ms RTs from an events data table.
%%
%% Arguments:
%% FileName = 'sub-CC110033_ses-smt_task-smt_events.tsv';
%% ========================================================================

function [cleanEvents] = clean_events(FileName)

  d = readtable(FileName,'FileType','text')

  idx = find(strcmp(d.trial_type,'button'));
  for i = 1:length(idx); check(i) = (d.onset(idx(i)) - d.onset(idx(i)-1)) == 0; end

  cleanEvents = d;
  cleanEvents(idx(check),:) = []; %drop RTs that equal 0

end

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