data dict

Global var [scannerdata]

• Attributes of each trial: 
• [iArtifacts]: if the current trial is considered as a "bad" trial due to artifacts, ∈ (0: good trial; 1: bad)
• [iTrialType]: trial type {1,2,3,4,-1}
• [iInstructionLength]: length of the instruction period, ∈(100:1000 ms), source: presentation log 5xxx.
• [iOffIndex]: the block index number for current trials's light off in eegData02, ∈(1:191)
• [iOffOffset]: the offset index number for current trials's light off  in each block in eegData02, ∈ (1:12500)
• [iOnIndex]: the block index number for current trials's light on in eegData02, ∈(1:191)
• [iOnOffset]: the offset index number for current trials's light on  in each block in eegData02, ∈ (1:12500)
• Attributes with respect to the raw markers (markerData(1, x).trial & time)
• [lightOnTimeClean]: clean events of light on events (with double trigger events manually removed)
• [lightOnCleanIndex]: index of clean events in the originally markers -- gData.markerData(1,1).trial
• [lightOffTimeClean]: clean events of light off events (with double trigger events manually removed)
• [lightOffCleanIndex]: index of clean events in the originally markers -- gData.markerData(1,2).trial
• EEG channel working data
• [eegData02]: EEG working data. {Column 1: left&Right. Column2: up&down. Column3: info channel}
• Column3 info channel data format: [condition].[iTrialtype]  e.g. 54.1 = light off for proleft, 52.3 = light on for antileft

MEGANTI - Preprocessing

[Presentation sce file]
In total 14 blocks, each block has 80 trials, each trial has following four events recorded in the log file:

1. [Start]: duration 1000 ms, code 0, port_code 1
2. [Pro] or [Anti] initiation: LightOn, (green pro, red anti) duration 100 ms, code 54, port_code 54, 
3. [pro5xxx] or [anti5xxx]: randomized length, code: 5+ [100:50:1000], e.g. 5100, 5250..., port_code [101:1:117]
4. [GO cue ∈ 1 | 2 | 3 | 4] :  duration 20 ms, LightOff

• 1: greyboxproleft, port_code 201 -- prostim left
• 2 :greyboxproright, port_code 202  -- prostim right
• 3: greyboxantileft, port_code 203 -- antistim left
• 4: greyboxantiright, port_code 204 - -- antistim right

Therefore(in preprocessing_subject.m), the duration of instruction (green or red box) = 100 ms (initiation) + x ms (x is indicated by event2 in matlab code).  The actual difference between light on and off is around 117-119 ms with some trials had more than 135 ms lag (var: timeLag).


Subjects
SW - [2010-08-11] - Old system no parallel code
raw: S02_MEG54_VEF_02.ds
stim log (raw): sw32-110810-SO2-Pro+Anti-saccade task.log
Problems in the data:

1. The stim log has 195 missing event condition, all replaced with -1.
2. The lightOn marker has 130 extra double triggers - fixed (lightOnTimeClean:1121)
3. The lightOff marker has 3 extra  double triggers - fixed (lightOffTimeClean:1120)
4. Verify by comparing the time diff between on and off with the event code, 121.40