stefano carli (Center for Translational Neurophysiology of Speech and Communication, Istituto Italiano di Tecnologia), Claudio Trapella (University of Ferrara/Dept. of Chemical and Pharmaceutical Sciences), Linda Lambertini (Center for Translational Neurophysiology of Speech and Communication, Istituto Italiano di Tecnologia), Anna Fantinati (University of Ferrara/Dept. of Chemical and Pharmaceutical Sciences), Elisa Castagnola (MEMS Research Lab., Department of Mechanical Engineering, College of Engineering), Claudia Cea (MEMS Research Lab., Department of Mechanical Engineering, College of Engineering), Surabhi Nimbalkar (MEMS Research Lab., Department of Mechanical Engineering, College of Engineering), Alice Scarpellini (Electron Microscopy Facility, Istituto Italiano di Tecnologia), Mirko Prato (Materials Characterization Facility, Istituto Italiano di Tecnologia), Sam Kassegne (MEMS Research Lab., Department of Mechanical Engineering, College of Engineering), Davide Ricci (Center for Translational Neurophysiology of Speech and Communication, Istituto Italiano di Tecnologia), Luciano Fadiga (Center for Translational Neurophysiology of Speech and Communication, Istituto Italiano di Tecnologia)