Poster B104, Sunday, March 26, 8:00 – 10:00 am, Pacific Concourse
Forgotten visual events from a naturalistic TV-viewing paradigm are associated with higher inter-trial coherence in the alpha band of the EEG
Daniel A. Rogers1, Phillip M. Alday1, Andrew W. Corcoran1, Jessica Gysin-Webster1, Magdalena Nenycz-Thiel2, Duane Varan3, Matthias Schlesewsky1, Ina Bornkessel-Schlesewsky1; 1School of Psychology, Social Work and Social Policy, University of South Australia, 2School of Marketing, University of South Australia, 3MediaScience, Austin, Texas, USA
Oscillatory activity in the EEG alpha band (approximately 8–12 Hz) is known to be associated with memory performance (e.g. prestimulus power/phase differences at encoding predict working memory performance). However, previous studies in this domain have used highly controlled experimental environments with explicit task demands. Here, we examined the relation between prestimulus alpha activity and success of memory encoding in a more naturalistic environment. Forty-two participants (28 female; mean age: 31 years; range 18–62) watched an hour of TV (two episodes of a popular comedy show) interspersed with 60 advertisements (36 from a previous study ; presented in 7 ad breaks), while their EEG was recorded. Video stills of 108 visual events within the ads were presented to participants as part of a surprise recall task following the TV viewing, interspersed with an equal number of unseen images. We examined alpha power and inter-trial coherence (ITC) at individual alpha frequency during the prestimulus interval for critical events, sorted by recall performance (hit/miss). Statistical analyses were performed using mixed-effects models. Results showed no relationship between prestimulus alpha power and recall, but significantly higher ITC for misses versus hits. These findings provide an initial indication that the systematic relationship between alpha phase and memory recall generalises to naturalistic settings without an explicit task. 1. Myers NE et al. (2014). J Neurosci, 34(23), 7735-7743. 2. Varan D et al. (2016). Advertising Research Foundation Re!Think 2016 Conference, New York.
Topic Area: LONG-TERM MEMORY: Other