Unobtrusive ambulatory EEG using a smartphone and flexible printed electrodes around the ear

Abstract

This study presents first evidence that reliable EEG data can be recorded with a new cEEGrid electrode array, which consists of ten electrodes printed on flexible sheet and arranged in a c-shape to fit around the ear. Ten participants wore two cEEGrid systems for at least seven hours. Using a smartphone for stimulus delivery and signal acquisition, resting EEG and auditory oddball data were collected in the morning and in the afternoon six to seven hours apart. Analysis of resting EEG data confirmed well-known spectral differences between eyes open and eyes closed conditions. The ERP results confirmed the predicted condition effects with significantly larger P300 amplitudes for target compared to standard tones, and a high test-retest reliability of the P300 amplitude (r > = .74). Moreover, a linear classifier trained on data from the morning session revealed similar performance in classification accuracy for the morning and the afternoon sessions (both > 70%). These findings demonstrate the feasibility of concealed and comfortable brain activity acquisition over many hours.

Removal of eye blink artifacts in wireless EEG sensor networks using reduced-bandwidth canonical correlation analysis

“…Such small EEG modules are discreet, albeit limited in number of channels and spatial coverage. If necessary, a second wireless EEG module can be deployed at the other ear to obtain a better spatial coverage, and to increase the number of available channels [8]. This is similar to the existing concept of binaural hearing aids, where a wireless link between hearing aids at both ears allows communication for improved sound quality and localization [10].…”

“…whereŜ 1,k and X k are defined as the node-specific time signals containing observations of respectivelyŝ 1,k and x k in a window of length L, analogous to (8) and (9), and where α k,i is the scaling factor that fits the eye blink estimateŝ 1,k to EEG channel i of node k. The artifacts in node k can then be subtracted to find the clean EEG channels aŝ…”

“…For example, to design so-called neuro-steered hearing prostheses [5], [6], a small EEG module can be integrated into a hearing prosthesis for in-the-ear [7] or around-theear [8] EEG recordings, and even the implanted electrodes of a cochlear implant can be used to record EEG [9]. Such small EEG modules are discreet, albeit limited in number of channels and spatial coverage.…”

High-Intensity Chronic Stroke Motor Imagery Neurofeedback Training at Home: Three Case Reports

“…They are portable and low in cost, 18,19 perform on par with nonportable EEG systems, 20 and soon, NF protocols will be available on smartphones. 21 We investigated whether home-based, frequent MI EEGbased NF training is feasible. Specifically, we examined whether chronic stroke patients can stay motivated over a 4-week training period.…”

EEG-based attention-driven speech enhancement for noisy speech mixtures using N-fold multi-channel Wiener filters

“…Supported by discreet EEG recording technology [9]- [11], such AAD algorithms could work hand in hand with noise This work was carried out at the ESAT and ExpORL Laboratory of KU Leuven, and was supported by a research gift of Starkey Hearing Technologies, and has received funding from KU Leuven Special Research Fund BOF/STG-14-005, OT/14/119, C14/16/057 and CoE PFV/10/002 (OPTEC), IUAP nr. P7/19 (DYSCO), and the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programme (grant agreement No 637424).…”