Cover legend: Photograph of the Cyberkinetics microelectrode ("Utah") array and a tungsten in glass microelectrode. The Utah array consists of a 4 mm square base with 100 silicon electrodes, each 1.0 mm in length. The exposed tips (50 µm) are metallized with platinum, whereas the remainder of each electrode is insulated with parylene C. A penny is included for perspective. For more information, see the article by Kelly et al. in this issue (pages 261–264).