Poster B20, Sunday, March 26, 8:00 – 10:00 am, Pacific Concourse
Early frontal responses to emotional valence in an Affective Go-NoGo task: Theta-band changes in ventral ACC
Mario Liotti1, Killian Kleffner1, Ashley C Livingstone1, Megan Liau1; 1Simon Fraser University
The impact of Affect on Executive Function has been studied using tasks like the emotional Stroop (eStroop) and the Affective Go/NoGo. fMRI studies in such tasks show that changes in cognitive conflict requirements affected activity in lateral PFC and dorsal ACC, while changes in emotional salience activated medial PFC and ventral ACC (BA25, Moran et al, 2006). Similarly using ERPs, conflict generated by negative valence words reduced the amplitude of the N2, a component indexing cognitive control. However, no ERP wave has been so far associated to processing of emotional salience in the Affective Go-NoGo. Recently, our lab reported an early ERP modulation to task-irrelevant emotional valence in eStroop tasks (Early Anterior Positivity, EAP; 170-290msec; Taake et al, 2009). The present study recorded EEG in 21 undergraduates during an Affective Go/NoGo to test: 1) the presence of similar EAP modulations to emotional valence in such task; 2) if these effects localize to ventral ACC, 3) the corresponding frequency composition of source/scalp activity. Results show a Valence by Task interaction (F=4.5, p<.05) due to a difference in response to Valence for No-Go (F=5.09, p<.01), but not Go trials (F=.76, p>.05). Beamforming source analysis indicated that this effect is related to increases in theta-band activity generated by Ventral ACC (BA25) unique to Negative word processing. A clear functional dissociation emerged between Go trials, where Emotion valence affected the N2 index of cognitive control, and No-Go trials, where Emotion valence effects were restricted to the earlier EAP index of emotional salience.
Topic Area: EMOTION & SOCIAL: Emotion-cognition interactions