File:Real-Time-fMRI-Pattern-Decoding-and-Neurofeedback-Using-FRIEND-An-FSL-Integrated-BCI-Toolbox-pone.0081658.s002.ogv

English: Correlation-based feedback. The video shows an emotion task experiment (autobiographical memories associated with either guilt or indignation). Input parameters (reference anatomical and functional images, TR, number of functional volumes, baseline condition, etc) are entered in the FRIEND interface before clicking the Feedback button on the control window. Motion parameters are shown in the first three graphs during real-time acquisition and processing (rotation and translation for x, y and z in blue, green and red, respectively; the first volume of the run is assumed as the reference image). The average image signal across voxels contained in each of the two ROIs is shown in the fourth graph (re-scaled using Z-transformation). The bottom graph shows a sliding window correlation between the two ROIs in yellow. The green line represents a moving average of the real-time correlation (± one standard deviation), defining an interval for maximum and minimum values of the feedback scale (thermometer). The experimenter can visualize the task instruction and neurofeedback figures by clicking on the “NFB Figures” option in the Display menu. In this particular example, a thermometer is used to provide neurofeedback to the participant. During excessive motion, the thermometer is frozen and turns into gray to warn participants.