Cited by 63Neuroscience and Neural EngineeringAnalog and Mixed-Signal Circuit DesignEEG and Brain-Computer Interfaces

Long-term recording reliability of liquid crystal polymer µ ECoG arrays

Open access
Woods, Virginia, Trumpis, Michael, Bent, Brinnae, Palopoli-Trojani, Kay, Chiang, Chia-Han, Wang, Charles, Yu, Chunxiu, Insanally, Michele N +2 more·2018·Journal of Neural Engineering

Abstract

Objective . The clinical use of microsignals recorded over broad cortical regions is largely limited by the chronic reliability of the implanted interfaces. Approach . We evaluated the chronic reliability of novel 61-channel micro-electrocorticographic ( µ ECoG) arrays in rats chronically implanted for over one year and using accelerated aging. Devices were encapsulated with polyimide (PI) or liquid crystal polymer (LCP), and fabricated using commercial manufacturing processes. In vitro failure modes and predicted lifetimes were determined from accelerated soak testing. Successful designs were implanted epidurally over the rodent auditory cortex. Trends in baseline signal level, evoked responses and decoding performance were reported for over one year of implantation. Main results . Devices fabricated with LCP consistently had longer in vitro lifetimes than PI encapsulation. Our accelerated aging results predicted device integrity beyond 3.4 years. Five implanted arrays showed stable performance over the entire implantation period (247–435 d). Our regression analysis showed that impedance predicted signal quality and information content only in the first 31 d of recordings and had little predictive value in the chronic phase (>31 d). In the chronic phase, site impedances slightly decreased yet decoding performance became statistically uncorrelated with impedance. We also employed an improved statistical model of spatial variation to measure sensitivity to locally varying fields, which is typically concealed in standard signal power calculations. Significance . These findings show that µ ECoG arrays can reliably perform in chronic applications in vivo for over one year, which facilitates the development of a high-density, clinically viable interface.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1088/1741-2552/aae39d

Cites

105 of 105 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Approaches to increase density and lower invasiveness of ECoG are currently being developed for humans and animal models.

    “Different approaches to increase the density and lower the invasiveness of ECoG are currently being developed for use in humans and animal models176–182.”

    From The speech neuroprosthesis (2024) · cites this paper as [179]

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 1

  1. [76]Hemmerich KJ, “ General aging theory and simplified protocol for accelerated aging of medical devices,” MedPlastics Biomater, vol. 4, pp. 16– 24, 1998.

Cited by

Sorted by citations

Authors
Woods, V., Trumpis, M., Bent, B., Palopoli-Trojani, K., Chiang, C.-H., Wang, C., Yu, C., Insanally, M. N., Froemke, R. C., & Viventi, J.
Affiliations
  • Duke University (US)
  • New York University (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
Viventi, Jonathan
Venue
Journal of Neural Engineering
Published
2018-10-22
Volume
15
Issue
6
Pages
066024
ISSN
  • 1741-2552 (ISSN-L)
  • 1741-2560
OpenAlex
W2892615159
Cited by
63
References
105
Citations by year
2026: 9 · 2025: 8 · 2024: 7 · 2023: 6 · 2022: 7 · 2021: 9 · 2020: 12 · 2019: 5
FWCI
2.96
Type
journal article
Language
en
Open access
Locations
  • Journal of Neural Engineering (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Steven W Smith Fellowship
  • Defense Advanced Research Projects Agency (DARPA-BAA-16-09)
  • Division of Computing and Communication Foundations (CCF1422914)
  • National Institute of Neurological Disorders and Stroke (U01 NS099697)
  • Howard Hughes Medical Institute
  • National Institute on Deafness and Other Communication Disorders (DC015543)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neural Engineering
  • Physical Sciences › Engineering › Biomedical Engineering › Analog and Mixed-Signal Circuit Design
  • Life Sciences › Neuroscience › Cognitive Neuroscience › EEG and Brain-Computer Interfaces
Keywords
polyimide encapsulation, accelerated aging, device lifetime prediction, auditory cortex, signal-to-noise ratio, impedance, neural decoding
MeSH terms
Electrocorticography, Acoustic Stimulation, Algorithms, Animals, Auditory Cortex, Electrodes, Implanted, Epidural Space, Female, Polymers, Reproducibility of Results, Electric Impedance, Rats, Sprague-Dawley, Rats, Signal-To-Noise Ratio, Brain-Computer Interfaces

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review