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ISSN : 1226-9654

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Vol.25 No.3
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The Effects of Perceptual Complexity and Valence on IAPS Picture Processing: an ERP study

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
2013, v.25 no.3, pp.249-271
https://doi.org/10.22172/cogbio.2013.25.3.001


& (2013). The Effects of Perceptual Complexity and Valence on IAPS Picture Processing: an ERP study. The Korean Journal of Cognitive and Biological Psychology, 25(3), 249-271, https://doi.org/10.22172/cogbio.2013.25.3.001
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Abstract

This study examined the effects of affective valence and perceptual complexity of the IAPS (International Affective Picture System) pictures on affective picture processing using ERP (event-related potential) component analysis. ERP components as EPN (early posterior negativity) and LPP (late positive potential) have been reported to be modulated by valence, but some recent studies reported that LPP could be modulated by perceptual complexity as well as valence. To elucidate the modulatory effects of perceptual complexity and valence of IAPS pictures on ERPs, we examined the interaction of perceptual and affective modulations at EPN (220-280ms time window), LPP (350-600ms time window) and delta frequency (1-3Hz). Participants were asked to do affective judgement about each of IAPS pictures while ERPs were recorded. Average amplitudes of EPN at occipito-temporal area demonstrated significant effect of valence, perceptual complexity, and interaction of valence and complexity. For neutral and positive pictures, complex pictures showed higher amplitude than simple pictures, but no complexity effect was found for negative pictures. For complex pictures, negative pictures showed lower amplitude than neutral and positive pictures (EPN emotion effect of negative pictures), but no valence effect was found for simple pictures (no EPN emotion effect). Average amplitudes of LPP at parietal area demonstrated significant effect of valence and perceptual complexity. Negative pictures showed higher amplitude than neutral and positive pictures for both complex and simple pictures (LPP emotion effect of negative pictures). For neutral and positive pictures, simple pictures showed higher amplitude than complex pictures, but no complexity effect was found for negative pictures. No hemisphere-related interaction effect was found at both EPN and LPP. Maximum peak-to-peak difference amplitudes of delta at parietal area demonstrated significant effect of valence, but no significant effect of perceptual complexity was found. Negative pictures showed higher amplitude than neutral and positive pictures. The findings suggest that both LPP and EPN components are modulated by perceptual complexity as well as valence of affective pictures, but perceptual complexity effect can be attenuated or eliminated by negative valence. Delta frequency elicited by parietal area seems to be related with LPP, but contributes to only valence effect. Overall results suggest the motivational importance and priority of processing of negative stimuli.

keywords
IAPS, affective valence, perceptual complexity, LPP, EPN, delta frequency, 국제정서사진체계(IAPS), 정서가, 지각적 복잡성, LPP, EPN, delta

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