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Codebook-based electrooculography data analysis towards cognitive activity recognition.

TitleCodebook-based electrooculography data analysis towards cognitive activity recognition.
Publication TypeJournal Article
Year of Publication2018
AuthorsLagodzinski P., Shirahama K., Grzegorzek M.
JournalComputers in biology and medicine
Date Published2018 04 01
Publication Languageeng

With the advancement in mobile/wearable technology, people started to use a variety of sensing devices to track their daily activities as well as health and fitness conditions in order to improve the quality of life. This work addresses an idea of eye movement analysis, which due to the strong correlation with cognitive tasks can be successfully utilized in activity recognition. Eye movements are recorded using an electrooculographic (EOG) system built into the frames of glasses, which can be worn more unobtrusively and comfortably than other devices. Since the obtained information is low-level sensor data expressed as a sequence representing values in constant intervals (100 Hz), the cognitive activity recognition problem is formulated as sequence classification. However, it is unclear what kind of features are useful for accurate cognitive activity recognition. Thus, a machine learning algorithm like a codebook approach is applied, which instead of focusing on feature engineering is using a distribution of characteristic subsequences (codewords) to describe sequences of recorded EOG data, where the codewords are obtained by clustering a large number of subsequences. Further, statistical analysis of the codeword distribution results in discovering features which are characteristic to a certain activity class. Experimental results demonstrate good accuracy of the codebook-based cognitive activity recognition reflecting the effective usage of the codewords.

PubMed Link


Alternate JournalComput. Biol. Med.
Created at October 15, 2018 - 10:11am.


Program of Study

Study Medical Informatics
at the University of Lübeck

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