There are two ways to select the data (Figure 1). After you have selected 'Yes' for the question 'Is your data stored in one folder?', figure window (Figure 2) to select the root folder for subjects and sessions will be opened. Figure 3 is used to get the common file pattern of the images (like Oddball.mat) and answer for question 'Are the session folders inside subject folders?'. If 'Yes' is selected for the previous question, data with the matching file pattern from each subject sub-folder will be used.
Note:Figure 1: Data selection method
Figure 2: Figure window to select root folder for subjects and sessions
Figure 3: File pattern and additional question regarding whether the images are in session folder or in subject folder.