A multichannel telemetry system for single unit neural recordings.
We present the design, testing, and evaluation of a 16 channel wearable telemetry system to facilitate multichannel single unit recordings from freely moving test subjects. Our design is comprised of (1) a 16-channel analog front end board to condition and sample signals derived from implanted neural electrodes, (2) a digital board for processing and buffering the digitized waveforms, and (3) an index-card sized 486 PC equipped with an IEEE 802.11b wireless ethernet card. Digitized data (up to 12 bits of resolution at 31.25k samples/s per channel) is transferred to the PC and sent to a nearby host computer on a wireless local area network. Up to 12 of the 16 channels were transmitted simultaneously for sustained periods at a range of 9 m. The device measures 5.1 cm x 8.1 cm x 12.4 cm, weighs 235 g, and is powered from rechargeable lithium ion batteries with a lifespan of 45 min at maximum transmission power. The device was successfully used to record signals from awake, chronically implanted macaque and owl monkeys.
Obeid
Iyad
I
Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA. io@duke.edu
Nicolelis
Miguel A L
MA
Wolf
Patrick D
PD
D000200:Action Potentials / Q000502:physiology*; D000703:Analog-Digital Conversion; D000818:Animals; D004582:Electronics, Medical; D004594:Electrophysiology; D004867:Equipment Design; D000882:Haplorhini; D008839:Microelectrodes; D009474:Neurons / Q000502:physiology*; D012815:Signal Processing, Computer-Assisted; D013686:Telemetry / Q000295:instrumentation / Q000379:methods*