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Absolute Eye Gaze Estimation With Biosensors in Hearing Aids
Eriksholm Res Ctr, Denmark; Tech Univ Denmark, Denmark.
Eriksholm Res Ctr, Denmark.
Eriksholm Res Ctr, Denmark.
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering. Eriksholm Res Ctr, Denmark.
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2019 (English)In: Frontiers in Neuroscience, ISSN 1662-4548, E-ISSN 1662-453X, FRONTIERS IN NEUROSCIENCE, Vol. 13, article id 1294Article in journal (Refereed) Published
Abstract [en]

People with hearing impairment typically have difficulties following conversations in multi-talker situations. Previous studies have shown that utilizing eye gaze to steer audio through beamformers could be a solution for those situations. Recent studies have shown that in-ear electrodes that capture electrooculography in the ear (EarEOG) can estimate the eye-gaze relative to the head, when the head was fixed. The head movement can be estimated using motion sensors around the ear to create an estimate of the absolute eye-gaze in the room. In this study, an experiment was designed to mimic a multi-talker situation in order to study and model the EarEOG signal when participants attempted to follow a conversation. Eleven hearing impaired participants were presented speech from the DAT speech corpus (Bo Nielsen et al., 2014), with three targets positioned at -30 degrees, 0 degrees and +30 degrees azimuth. The experiment was run in two setups: one where the participants had their head fixed in a chinrest, and the other where they were free to move their head. The participants task was to focus their visual attention on an LED-indicated target that changed regularly. A model was developed for the relative eye-gaze estimation, taking saccades, fixations, head movement and drift from the electrode-skin half-cell into account. This model explained 90.5% of the variance of the EarEOG when the head was fixed, and 82.6% when the head was free. The absolute eye-gaze was also estimated utilizing that model. When the head was fixed, the estimation of the absolute eye-gaze was reliable. However, due to hardware issues, the estimation of the absolute eye-gaze when the head was free had a variance that was too large to reliably estimate the attended target. Overall, this study demonstrated the potential of estimating absolute eye-gaze using EarEOG and motion sensors around the ear.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2019. Vol. 13, article id 1294
Keywords [en]
eye gaze estimation; electrooculography; EarEOG; inertial sensors; head tracking; hearing aids; hearing-impaired
National Category
Other Medical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-163037DOI: 10.3389/fnins.2019.01294ISI: 000504073200001Scopus ID: 2-s2.0-85076948473OAI: oai:DiVA.org:liu-163037DiVA, id: diva2:1384255
Note

Funding Agencies|EUEuropean Union (EU) [644732]

Available from: 2020-01-09 Created: 2020-01-09 Last updated: 2020-02-14Bibliographically approved

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Skoglund, MartinLunner, Thomas
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