File:Rapid-parallel-path-planning-by-propagating-wavefronts-of-spiking-neural-activity-Movie2.ogv

English: Path planning and navigation in a system with multiple targets. This movie is related to Figure 4. Three wavefronts are initiated simultaneously at the place cells representing target locations B1, B2, B3. The expanding waves create SVFs with centers corresponding to the points of the wavefront initiation. The wavefronts inhibit each other effectively. The points where the wavefronts meet define borders of the basins of attractions of the particular SVFs. Red dots flashing on the screen represent action potentials. A simulated animal is initially located at point A. Activation of the place cells at A through the passing wavefront triggers the second phase of the process—the navigation. In this phase, the place cells with receptive fields covering the current animal location receive strong excitatory currents from sensory inputs. These cells are indicated in the movie by green dots. The current animal location is denoted by the yellow circle. The stimulated cells fire and in turn excite neighboring cells. Due to the SVF the active cells excite most strongly these neighbors that are located along an optimal pathway toward the nearest target. A simple motor control algorithm (Equations 10, 11) is used to move the animal toward the locations represented by the firing cells, up to the target location.