Subject,Unique numeric code for each participant
Group,Between-subjects mapping of target features (the four colours and the four shapes) to left/right responses; 1-4
firstTrial,1 = first trial in block (never analysed); 0 = all trials after the first trial in the block
CueACC,accuracy of cue-response:  1 = correct; 0 = incorrect
CuePrevAcc,accuracy of preceding cue-response (1 = correct; 0 = incorrect); blank for first trial in block
CueRT,RT of cue-response in ms from cue-onset
CTC,current trial completion (Go = completed; CO = cue-only)
PTC,preceding trial completion (Go = completed; CO = cue-only); blank for first trial in block
Transition,relation of current cue/task to preceding cue/task; blank for first trial in block
TargetACC,accuracy of target-response:  1 = correct; 0 = incorrect; blank = no target shown (either cue-only or completed with incorrect cue-response)
TargetPrevAcc,accuracy of preceding target-response;  1 = correct; noPrevTarget = no target shown (either cue-only or completed with incorrect cue-response); 0 = incorrect; blank for first trial in block. 
Cue,"actual cue shown on this trial.  N.B., cue also indicates task:  HUE & COLOUR cued the colour task; FORM & SHAPE cued the shape task"
TargetRT,RT of target-response in ms from target-onset; blank on trials where there was no target stimulus shown
Cue.CRESP,correct cue-response on this trial (1 or 2 for cue-responses)
Cue.RESP,actual cue-response recorded on this trial
TargetColour,colour of target stimulus; blank on trials where there was no target stimulus shown
TargetShape,shape of target stimulus; blank on trials where there was no target stimulus shown
Target.CRESP,correct target-response on this trial (5 or 6 for target-responses); blank on trials where there was no target stimulus shown
Target.RESP,actual target-response recorded on this trial; blank on trials where there was no target stimulus shown