Fig. 5.

Electrode and RF stability. A: no. of consecutive days that observed RFs remained stable for each array. Channel RFs tended to remain stable for 1 or 2 days, with a maximum of 7 days. These data were collected over 20 sessions across 2 monkeys (WH and TE), whose distributions were very similar. B: array longevity for 5 electrode arrays. Points represent number of sorted neurons recorded after array implantation. Early implants (KR, HA) degraded rapidly after initial implantation. Longevity in LA2 and TE improved, as measured by no. of units. One subject, OL, developed a fatal case of acute meningoencephalitis.