Identifying auditory attention with ear-EEG: cEEGrid versus high-density cap-EEG comparison

Area of Science:

• Neuroscience
• Auditory Neuroscience
• Biomedical Engineering

Background:

• Classical electroencephalography (EEG) cap setups are standard for brain activity measurement.
• Ear-centered EEG offers a potentially more convenient and concealed alternative.
• Understanding the efficacy of novel electrode arrays is crucial for advancing EEG applications.

Purpose of the Study:

• To directly compare the performance of a traditional EEG cap with a new around-the-ear electrode array (cEEGrid).
• To evaluate the potential of ear-centered EEG for capturing auditory attention.
• To assess the feasibility of using cEEGrids for auditory attention monitoring.

Main Methods:

• Concurrent EEG data acquisition using a standard EEG cap and two cEEGrids (left and right ear).
• Participants performed a spatial auditory attention task involving three distinct sound streams.
• Analysis included identifying attention-modulated event-related potentials (ERPs) and single-trial classification of attention direction.

Main Results:

• Both EEG systems demonstrated clear, comparable attention-modulated ERPs.
• Single-trial template matching successfully decoded attention direction above chance for most participants with both systems.
• Classification results highlight the high signal quality obtained from cEEGrids.

Conclusions:

• Around-the-ear EEG recordings are feasible and can accurately measure well-established ERPs.
• cEEGrids show significant potential as a viable alternative to traditional EEG caps for specific applications.
• Behind-the-ear EEG offers a promising, concealed method for auditory attention monitoring.