FIG. 1.
A Image of the AMI array developed by Cochlear Ltd. (Lane Cove, Australia). The array is 6.2 mm long with a diameter of 0.4 mm. It consists of 20 platinum ring electrodes linearly spaced at an interval of 200 μm. Each site has a thickness of 100 μm (surface area of 126,000 μm²). A stainless steel stylet is positioned through the axial center of the silicone carrier to enable insertion of the array into the brain and is intended for removal after placement for human implantation. Further details on the AMI electrode array are included in Lenarz et al. (2006b). B A multi-site silicon substrate “Michigan” probe consisting of four shanks magnified in C that were each separated by 400 μm, 5 mm long and 15 μm thick. Along each shank, eight iridium sites (400 μm2 surface area) were linearly spaced at a distance of 100 μm.