Skip to content
cEEGrid Guide

Denk et al., 2018

hearing-device ERP

为什么重要

  • 路线定位:in-ear and around-ear / hearing-device ERP。
  • 任务或证据:Hearing-device ERP switch
  • 自研用途:Control acoustic/device artifacts in hearable EEG tests.

Evidence Matrix Summary

FieldValue
Route / hardwareHearing device + right cEEGrid/in-concha
Task / evidence baseHearing-device ERP switch
Main findingcEEGrid SNR exceeded local in-concha; N100/P300 detected to device setting changes.
Key limitationERP confounded by hardware noise onset.
Use for our systemControl acoustic/device artifacts in hearable EEG tests.

PDF Download

下载 PDF

静态路径:/papers/15-denk-2018.pdf

Detailed Reading Card

基本信息

  • 年份/出处: 2018, Trends in Hearing, 22.
  • DOI: 10.1177/2331216518788219.
  • 路线: right-ear hearing-device integration with cEEGrid + in-concha electrodes。
  • 本地文件: library/pdfs_by_category/04_sleep_hearing_real_world/15_2018_denk_et_al_event_related_potentials_measured_from_in_and_around_the_ear_electrodes_integrat.pdf

研究问题

  • 目标是首次评估 ear-EEG 与实时 electroacoustic hearing device 集成后,是否能从 N100/P300 ERP 中识别 hearing-device processing setting switch(Abstract; Intro; PDF pp. 1-2)。
  • 第二目标是比较 around-the-ear cEEGrid 与 in-concha electrodes 的信号质量(Intro/Methods; PDF p. 2)。

硬件系统

  • 听力设备: individualized soft silicone in-the-ear earmold,内含 pickup microphone、loudspeaker 和指向鼓膜的 microphone;Master Hearing Aid platform 实时处理,RME Multiface II,input-output delay 7.8 ms(Acoustic Setup; PDF p. 2)。
  • EEG: 右耳 10 个 cEEGrid around-the-ear electrodes + 3 个 concha electrodes;Ag/AgCl miniaturized ton electrodes 插入 earmold bores(EEG Setup; Fig. 1; PDF p. 3)。
  • 放大器: SMARTING mobile 24-channel DC EEG amplifier,24-bit,500 Hz;R4a/R4b 为 ground/reference(EEG Setup; PDF p. 3)。

电极点位 / 布局

  • 只分析右耳,即 hearing device 所在侧,以模拟 fully integrated system(EEG Setup; PDF p. 3)。
  • 主要 ERP 通道为 vertical bipolar cEEGrid: ((R2 + R3)/2) - ((R6 + R7)/2)(EEG Analysis; PDF p. 5)。
  • 电极配置比较包括 Grid、Concha、Grid/Concha 三类 reference scheme(Influence of Electrode Position; PDF p. 6)。

实验设计

  • 被试: 17 名正常听力被试,age 28.4 +/- 5.4,10 male、7 female;3 人因行为标准未达标排除,统计分析保留 14 人(Participants; Results; PDF pp. 2, 6)。
  • 任务: 每 trial 四个声音,半数 trial 在第三和第四声之间切换 hearing-device output filter;被试判断第三/第四声是否有差异(Paradigm; PDF p. 4)。
  • 刺激: Noise、Speech、Speech-in-Noise,500 ms,间隔 300 ms;总 192 trials,4 blocks,session 约 90 min(Stimuli/Paradigm; PDF pp. 4-5)。

信号处理流程

  • EEGLAB + MATLAB,统计用 RStudio;0.1-20 Hz FIR;whole-trial epochs -1000 to 4000 ms,相对单声 epochs -500 to 1000 ms(EEG Analysis; PDF p. 5)。
  • 额外提取 hearing-device hardware noise onset O1-O4 locked epochs;artifact rejection 使用 EEGLAB probability criterion SD=2,平均剔除 27.1% +/- 6.7% trials(EEG Analysis; PDF p. 5)。
  • N100: peak latency +/-20 ms;P300: 230-430 ms mean amplitude;SNR 用 plus-minus procedure 估计 noise(EEG Analysis; PDF pp. 5-6)。

结果

  • 行为: identical 平均正确 90.0%,deviant 正确 93.3%,3.6% trials 无回应,说明 filter switch 明显可听(Psychophysical Results; PDF p. 6)。
  • N100 repetition: S1 > S2,F(1,13)=13.22, p=.003;O4 device onset 的 filter-switch N100 显著,F(1,13)=15.36, p=.002(EEG Results; PDF p. 7)。
  • P300: O4 device onset deviant > identical,F(1,13)=12.25, p=.004(Fig. 7; PDF p. 8)。
  • 电极比较: cEEGrid Grid SNR 最高,M=16.18, SD=6.16,显著高于 local in-concha Concha M=7.55, SD=6.70, t(13)=4.10, p=.001(Fig. 8; PDF pp. 8-9)。
  • in-concha channels referenced to R4b 彼此高度相关 r=.99;cEEGrid 与 in-concha 相关低,median r=.12,说明信息部分非冗余(Fig. 9; PDF p. 9)。

局限

  • 核心 ERP 差异主要锁定到 device hardware noise onset O4,而非实际声音 S4;说明被试可能基于硬件噪声完成判断(Discussion; PDF pp. 10-11)。
  • around-ear 与 in-concha 使用不同电极技术,SNR 比较可能受硬件差异影响;作者建议未来用相同电极技术与更低输入噪声放大器(Discussion; PDF p. 12)。
  • 正常听力被试听到硬件噪声,结果不一定直接外推到听损用户(Discussion; PDF p. 11)。

对自研的启发

  • 助听器-EEG 集成实验必须控制 device noise、filter switching artifacts 和声学 cue,否则 EEG 可能揭示的是设备噪声感知。
  • around-ear electrodes 在该任务下优于 in-concha,但 in-concha 可能提供非冗余信息;混合布局值得保留。
  • 实时听力设备验证应同时报告声学链路延迟、耳模结构、LSL trigger 同步和硬件噪声。

Metadata

FieldValue
IDp15_denk_2018_hearing_device_erps
TitleEvent-Related Potentials Measured From In and Around the Ear Electrodes Integrated in a Live Hearing Device for Monitoring Sound Perception
Year2018
Category04_sleep_hearing_real_world
Routein-ear and around-ear
Stagehearing-device ERP
Statusprocessed
Source integrityok
Pages14
OCR statusnot_needed

Evidence Groups

GroupHitsPages
hardware12p. 1, p. 2, p. 3
electrode_layout12p. 1, p. 2, p. 3
experiment12p. 1, p. 2, p. 3
signal_processing12p. 1, p. 2, p. 3, p. 4, p. 5
results12p. 1, p. 2, p. 4, p. 5, p. 6
limitations12p. 2, p. 3, p. 4, p. 5, p. 6, p. 7, p. 8, p. 9

Local Evidence Sources

  • Source PDF path: US-pdf/denk-et-al-2018-event-related-potentials-measured-from-in-and-around-the-ear-electrodes-integrated-in-a-live-hearing.pdf
  • Public PDF path: /papers/15-denk-2018.pdf
  • Categorized PDF path: library/pdfs_by_category/04_sleep_hearing_real_world/15_2018_denk_et_al_event_related_potentials_measured_from_in_and_around_the_ear_electrodes_integrat.pdf
  • Extracted text path: library/texts/04_sleep_hearing_real_world/15_2018_denk_et_al_event_related_potentials_measured_from_in_and_around_the_ear_electrodes_integrat.txt
  • Detailed card source: library/DETAILED_PAPER_CARDS_BATCH_3.md
  • Page-level evidence index: library/EVIDENCE_INDEX.md

Close Reading Checklist

  • Verify exact figures, tables, page numbers, and statistics against the local PDF before formal citation.
  • Keep missing parameters as Not reported unless the PDF or supplementary material confirms them.
  • Mark any cross-paper synthesis as interpretation rather than a single-paper claim.