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Comparison Enhances Size Sensitivity: Neural Correlates of Outcome Magnitude Processing

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  • Qiuling Luo
  • Chen Qu

Abstract

Magnitude is a critical feature of outcomes. In the present study, two event-related potential (ERP) experiments were implemented to explore the neural substrates of outcome magnitude processing. In Experiment 1, we used an adapted gambling paradigm where physical area symbols were set to represent potential relative outcome magnitudes in order to exclude the possibility that the participants would be ignorant of the magnitudes. The context was manipulated as total monetary amount: ¥4 and ¥40. In these two contexts, the relative outcome magnitudes were ¥1 versus ¥3, and ¥10 versus ¥30, respectively. Experiment 2, which provided two area symbols with similar outcome magnitudes, was conducted to exclude the possible interpretation of physical area symbol for magnitude effect of feedback–related negativity (FRN) in Experiment 1. Our results showed that FRN responded to the relative outcome magnitude but not to the context or area symbol, with larger amplitudes for relatively small outcomes. A larger FRN effect (the difference between losses and wins) was found for relatively large outcomes than relatively small outcomes. Relatively large outcomes evoked greater positive ERP waves (P300) than relatively small outcomes. Furthermore, relatively large outcomes in a high amount context elicited a larger P300 than those in a low amount context. The current study indicated that FRN is sensitive to variations in magnitude. Moreover, relative magnitude was integrated in both the early and late stages of feedback processing, while the monetary amount context was processed only in the late stage of feedback processing.

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  • Qiuling Luo & Chen Qu, 2013. "Comparison Enhances Size Sensitivity: Neural Correlates of Outcome Magnitude Processing," PLOS ONE, Public Library of Science, vol. 8(8), pages 1-9, August.
    • Handle: RePEc:plo:pone00:0071186
    DOI: 10.1371/journal.pone.0071186
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    2. Harry Markowitz, 1952. "The Utility of Wealth," Journal of Political Economy, University of Chicago Press, vol. 60, pages 151-151.
    3. Rong Chen & Jianmin Jia, 2005. "Consumer Choices Under Small Probabilities: Overweighting or Underweighting?," Marketing Letters, Springer, vol. 16(1), pages 5-18, January.
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    Cited by:

    1. Qingguo Ma & Yue Hu, 2015. "Beauty Matters: Social Preferences in a Three-Person Ultimatum Game," PLOS ONE, Public Library of Science, vol. 10(5), pages 1-17, May.

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