Poster F20, Tuesday, March 28, 8:00 – 10:00 am, Pacific Concourse
The Sound and the Fury: Late Positive Potential is Sensitive to Sound Affect
Darin Brown1, James Cavanagh1; 1University of New Mexico
Emotion is an emergent construct of multiple primitive sub-processes. EEG is uniquely sensitive to real-time neural computations, and thus is an excellent tool to study the construction of emotion. This series of studies aimed to probe the mechanistic contribution of the Late Positive Potential (LPP) to multi-modal emotion perception. Experiment 1 revealed valence differences in the P3 time range for visual images paired with sounds, and differences in the LPP time range for sounds alone. Experiment 2 manipulated this audio-visual enhancement by altering the valence pairings with congruent (e.g. positive audio + positive visual) or conflicting emotional pairs (e.g. positive audio + negative visual). Negative visual stimuli evoked larger early LPP amplitudes, regardless of sound pairing. However, time frequency analyses revealed significant midfrontal theta-band power differences between conflicting and congruent stimuli pairs suggesting very early (~500ms) realizations of thematic fidelity violations. Interestingly, LPP modulations were reflective of the congruency of the stimuli pairs. Together, these findings suggest that enhanced parietal activity for affective valence is not only dependent on visual processes. Furthermore, these findings suggest that altered neural activities for affective visual stimuli are enhanced by concurrent affective sounds, paving the way towards an understanding of the construction of multi-modal affective experience.
Topic Area: EMOTION & SOCIAL: Emotional responding