A mobile recording system and an acquisition control method for average event-related potential measurements

Antti Paukkunen

    Research output: ThesisDoctoral ThesisCollection of Articles

    Abstract

    Event-related potentials (ERPs) are a result of the activity elicited in the brain during the performance of a cognitive task. They can be studied by using an EEG, and are used to investigate the brain functions related to the processing of sensory data, and memory. The technique is flexible, and affordable, and has various potential diagnostic applications. The clinical feasibility, however, is limited due to the low measurement reliability. In addition, performance of the tests could be enhanced if the recording devices were more robust. The current study presents two ways of improving the performance of ERP measurements. The first deals with the improvement of the efficiency of the recording procedure and the second, with the optimization of the recording system design for clinical use. In addition, the discussion on improving the measurement reliability is contributed to by conducting a study with mismatch negativity (MMN) to determine the relationship between the measurement error and the test-retest reliability. To improve the recording procedure, an acquisition control method is suggested which helps optimize the amount of data recorded in terms of its concurrent quality. It allows optimization of the recording time and control of the measurement error, which reduces subject discomfort and improves measurement repeatability. In the MMN study conducted, the effect varied, depending on the parameterization, and whether the deviant responses were studied separately or as a profile. It was, however, generally significant, and repeatability was estimated to keep improving until the error level went below 10% of the peak amplitude. Second, a mobile ERP recording system design with an integrated audio stimulation unit is presented. It is easy to apply, and capable of performing online data analysis. It is also tolerant of external interference because of its compact size, close proximity to the measured target, and the average grounding arrangement it uses. This kind of design allows fluent performance of the measurements in applications where the target activity is well-defined, which is important in an attempt to allow clinical use to be made of them. Together with the application of the algorithm developed, it provides easy access to ERPs and makes the investigations efficient, and less inconvenient.
    Translated title of the contributionMobiili mittauslaitteisto ja signaalinkeruun ohjausmenetelmä keskiarvoistettuihin EEG-herätevastemittauksiin
    Original languageEnglish
    QualificationDoctor's degree
    Awarding Institution
    • Aalto University
    Supervisors/Advisors
    • Sepponen, Raimo, Supervising Professor
    • Sepponen, Raimo, Thesis Advisor
    Publisher
    Print ISBNs978-952-60-4562-7
    Electronic ISBNs978-952-60-4563-4
    Publication statusPublished - 2012
    MoE publication typeG5 Doctoral dissertation (article)

    Keywords

    • electroencephalogram
    • event-related potential measurement
    • instrumentation
    • mismatch negativity
    • measurement error
    • signal-to-noise ratio
    • test-retest reliability

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