ISSN : 1226-9654
Several studies employing oddball paradigm indicated that people are very sensitive to emotionally negative events. However, it cannot be excluded that the negativity bias reported in those studies might be due to the frequency of the target stimulus rather than emotional valence. To elucidate the effect of valence and the effect of probability of target stimuli in oddball paradigm, we manipulated the probability of negative and those of neutral IAPS pictures as follows: 25% vs. 75%, 50% vs. 50%, and 75% vs. 25%. ERP results showed that P3 (250-400ms), an attention-related component, showed the probability effect, i.e. higher amplitudes in response to stimuli of 25% and 50% probability than in response to stimuli of 75% probability at parietal sites. On the contrary, later LPP (600-1200ms), an attention- and emotion-related component, showed valence effect, i.e. higher amplitudes in response to negative stimuli than neutral stimuli at centro-parietal sites. Also, LPP at some centro-parietal sites showed probability effect, i.e. higher amplitude in response to negative stimuli of 25% and 50% probability than those of 75% probability. But both P3 and LPP showed no probability effect in response to neutral stimuli. The probability effect on P3 as well as valence effect and probability effect on LPP suggest that attentional bias effect and emotional bias effect could be distinguishable on some ERP components.
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