Visually Guided Saccade Details
!! Note that, for "Visually guided saccade task", the data has been already merged across days!!
"Exp date" refers to the date we uploaded the data for Neurotycho. The dates we conducted the experiments were as below.
Monkey Qu: 20120417, 20120423, 20120424, 20120426
Monkey Cn: 20140612, 20140613, 20140616
- Data format
Three types of the mat-files were uploaded for each monkey.
A "ECoG_chXXX.mat" contains ECoG signal recorded from the channel XXX (XXX =001-128). Loading each file, you'll obtain the matrix "data" that is the 2D matrix of trial*time. Each row is an ECoG signal for each trial starting from 1 sec before the onset of the fixation point (FP) onset. Thus for example, you can draw ERP assigned to the FP onset by plot(mean(data,1)).
B "info.mat" contains "prms" (struct) and "eyeData" (cell). "prms" is the time-stamps of the events and the task parameters (see below i) for the details) for each trial. The time zero is the timing of the FP onset. For the trials in which the monkey was waiting for the FP onset around the center of the display before the FP turned on, prms.fixStart(n) became 1. "eyeData" contains the horizontal and vertical eye positions in each trial. Note that the sampling rate of the eye positions was 500 Hz that is different from that for ECoG signals (1 kHz).
i) The field names of "prms"
fixStart : the time of the fixation start
rewOn: the time of the reward delivery
tgOn: the time of the target onset
saccOn: the time of the saccade detected online
tgPolarAngle: the polar angle of the ST position
tgEcc: the eccentricity of the ST position
ii) Basically we adopted the block-design. Each block contained about a few hundred trials. Within a block, the position of the target was fixed in terms of the eccentricity, and the number of the possible positions was 4 for each block, which means, the polar angle of the target was 45, 135, 225, or 315 in some blocks, and 90, 180, 270 or 360 in the other blocks.
C "elPosition_XX.mat" is the information about the location of the electrodes on the cortical surface (XX = Qu, Bt. or Cn). You can see the location of the electrodes with the code like this;
figure, imagesc(IMG), axis equal, axis off, hold on, plot(elX,elY,'ko'),
for iCh =1:length(elX)
text(elX(iCh), elY(iCh), sprintf('%d',iCh))