4.7 Article

Neural representation of task difficulty and decision making during perceptual categorization: A timing diagram

期刊

JOURNAL OF NEUROSCIENCE
卷 26, 期 35, 页码 8965-8975

出版社

SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.1655-06.2006

关键词

task difficulty; decision making; electroencephalography (EEG); single-trial analysis; diffusion model; timing diagram

资金

  1. NIBIB NIH HHS [R33 EB004730, R21 EB004730, EB004730] Funding Source: Medline
  2. CLC NIH HHS [C0000008] Funding Source: Medline

向作者/读者索取更多资源

When does the brain know that a decision is difficult to make? How does decision difficulty affect the allocation of neural resources and timing of constituent cortical processing? Here, we use single-trial analysis of electroencephalography (EEG) to identify neural correlates of decision difficulty and relate these to neural correlates of decision accuracy. Using a cued paradigm, we show that we can identify a component in the EEG that reflects the inherent task difficulty and not simply a correlation with the stimulus. We find that this decision difficulty component arises approximate to 220 ms after stimulus presentation, between two EEG components that are predictive of decision accuracy [an early (170 ms) and a late (approximate to 300 ms) component]. We use these results to develop a timing diagram for perceptual decision making and relate the component activities to parameters of a diffusion model for decision making.

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