This is a schematic demonstration of a 3D RAMP experiment. Initially a volume is acquired via a 3D raster scan over the field of view. After the volume is acquired, cells are selected by manually clicking in the center of those desired (visualized as black spheres). Then a 3D RAMP experiment is performed by hopping between the cells at fifty kilohertz to acquire the functional traces from all of the selected cells. This is visualized in the video by the yellow intensity of each cell in the movie. The activity is accelerated fourteen times for visualization. All the data displayed in this video (the volume data and fluorescent traces) are real data. Activity is accelerated by 10x for visualization purposes.