CaltechAUTHORS
Published March 2019 | Version public
Book Section - Chapter Metadata-only

Dipole Cancellation as an Artifact Suppression Technique in Simultaneous Electrocorticography Stimulation and Recording

Creators

  • 1. ROR icon University of California, Irvine
  • 2. ROR icon University of Southern California
  • 3. ROR icon California Institute of Technology

Abstract

Fully-implantable, bi-directional brain-computer interfaces (BCIs) necessitate simultaneous cortical recording and stimulation. This is challenging since electrostimulation of cortical tissue typically causes strong artifacts that may saturate ultra-low power (ULP) analog front-ends of fully-implantable BCIs. To address this problem, we propose an efficient hardware-based method for artifact suppression that employs an auxiliary stimulator with polarity opposite to that of the primary stimulator. The feasibility of this method was explored first in simulations, and then experimentally with brain phantom tissue and electrocorticogram (ECoG) electrode grids. We find that the canceling stimulator can reduce stimulation artifacts below the saturation limit of a typical ULP front-end, while delivering only ~10% of the primary stimulator's voltage.

Additional Information

© 2019 IEEE. Supported by National Science Foundation (Award # 1446908, 1646275).

Additional details

Identifiers

Eprint ID
95767
DOI
10.1109/NER.2019.8716961
Resolver ID
CaltechAUTHORS:20190523-142803960

Related works

Describes
10.1109/NER.2019.8716961 (DOI)

Funding

NSF
CNS-1446908
NSF
CNS-1646275

Dates

Created
2019-05-23
Created from EPrint's datestamp field
Updated
2021-11-16
Created from EPrint's last_modified field