[1] Univ Catania, Dept GF Ingrassia, Sect Neurosci, I-95123 Catania, Italy
[2] Oasi Inst Res Mental Retardat & Brain Aging IRCCS, Dept Neurol IC, I-94018 Troina, EN, Italy
[3] Univ Catania, Dept Chem, I-95125 Catania, Italy
[4] Univ Catania, Dept Elect Elect & Informat Engn, I-95125 Catania, Italy