Conference Contribution Details
Mandatory Fields
Khalil, Alexander K, Ying Wu, John Iversen
Neuroscience 2018--Society for Neuroscience Annual Meeting
Studying auditory processing in group contexts with low-density wireless eeg
San Diego, CA, USA
Poster Presentation
Optional Fields
This study examines the feasibility of studying auditory perception in multi-participant, free-field contexts using customized, research-grade low density (four to eight channels), wireless, dry EEG headsets. Large numbers of such easy to use headsets open many possibilities for data collection efficiency, as well as group brain dynamic studies. Research goals in this proof-of-concept were twofold. First, it was investigated if classic ERP components, such as N1, P2, mismatch negativity (MMN), and P300 complex, could be measured using this novel approach, and if well-documented effects associated with target detection can be replicated in a less-controlled, ecological setting. Second, it was explored if varying instructions to co-present participants can lead to task-related differences in observed effects. 39 healthy adults engaged in an auditory oddball detection task in groups of two to five. Stimuli were three types of 339 ms sinusoid pulses (250Hz, 650Hz, and 150Hz) presented over a powered speaker. Standards were presented pseudo-randomly at an 80% probability. The two types of oddball pulses occurred pseudo-randomly at a 10% probability, yielding an interchangeable set of targets and distractors. Participants were assigned to count one of the two types of oddball stimuli and ignore the other in a counterbalanced manner. In keeping with existing work, grand averaged ERPs revealed that stimulus probability modulated the amplitude of ERP components within the time window of the N1 (F(2,68) = 6.4, p < 0.01) and P300 (F(2,68) = 37.6, p < 0.01), while attention modulated the amplitude of the MMN (F(1,34) = 6, p < 0.01), as well as ERP responses to oddball targets within the window of the P2 (F(2, 68) = 7.2, p < 0.01), P300 (F(2,68) = 37.6, p < 0.01), and the late positive component (F(6,204) = 44, p < 0.01). Outcomes offer proof of concept that fine-grained measures of auditory processing and attention can be easily obtained in more naturalistic contexts, opening new possibilities for studying cognition and social dynamics outside of traditional laboratory settings.