Validating Theta Power as an Objective Measure of Cognitive Load in Educational Video

Autor/inn/en	Castro-Meneses, Leidy J.; Kruger, Jan-Louis; Doherty, Stephen
Titel	Validating Theta Power as an Objective Measure of Cognitive Load in Educational Video
Quelle	In: Educational Technology Research and Development, 68 (2020) 1, S.181-202 (22 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Castro-Meneses, Leidy J.)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1042-1629
DOI	10.1007/s11423-019-09681-4
Schlagwörter	Cognitive Processes; Difficulty Level; Video Technology; Educational Media; Medicine; Brain; Graduate Students; English (Second Language); Objective Tests; Recall (Psychology); Test Validity + Suchen Sie Ihr Suchwort? Cognitive process; Kognitiver Prozess; Schwierigkeitsgrad; Bildungsmittel; Unterrichtsmedien; Medizin; Gehirn; Graduate Study; Student; Students; Aufbaustudium; Graduiertenstudium; Hauptstudium; Studentin; English as second language; English; Second Language; Englisch als Zweitsprache; Objektiver Test; Abberufung; Testvalidität
Abstract	We know from the literature that high cognitive load can impede performance and educational outcomes. Previous measures of cognitive load have largely relied on subjective scales but few have explored more objective measures. This paper aims to address this issue by examining the validity of electroencephalography (or EEG) as an objective measure of cognitive load in the context of educational video. EEG is an online brain measure of the electrical activity that a population of neurons elicits when they are activated. Theta power is a brain oscillation ranging from 4 to 7 Hz that has been linked to cognitive and memory performance. We manipulated the linguistic complexity of three texts delivered by a speaker on video to induce a simple, a moderate and a complex level of cognitive load amongst a sample of students pursuing postgraduate studies through the medium of English as a second language (n = 35). We specifically measured intrinsic cognitive load via a subjective scale, a recall test, and theta power as an objective measure (average cognitive load). Our results show that the subjective scale was significantly different across the three levels of linguistic complexity. However, theta power and recall were only significantly different between the two most distinct levels of linguistic complexity. Although, this finding suggests theta power may not be as sensitive for average cognitive load as the subjective scale for intrinsic cognitive load, a correlation analysis shows that theta power was correlated with self-reported cognitive load. However, it may need more power compared to the subjective scale. These findings suggest that theta power may be developed into a valid objective measure of average cognitive load although its true potential lies in the possibility to measure online fluctuations in cognitive load or instantaneous cognitive load. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2024/1/01