1. Mercator Research Group; Functional Architecture of Memory Unit, Ruhr-University; Bochum 44780 Germany
2. Functional Architecture of Memory Department; Leibniz-Institute for Neurobiology; Magdeburg 39118 Germany
3. KOKORO-biology group; Osaka University; Osaka 565-0871 Japan
4. Medical Faculty; Functional Neuroplasticity Department, Otto von Guericke University; Magdeburg 39120 Germany
5. Otto von Guericke University, Center for Behavioral Brain Sciences; Magdeburg 39106 Germany