@article{ref1,
title="Neural representation of task difficulty and decision making during perceptual categorization: a timing diagram",
journal="Journal of neuroscience",
year="2006",
author="Philiastides, Marios G. and Ratcliff, Roger and Sajda, Paul",
volume="26",
number="35",
pages="8965-8975",
abstract="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 approximately 220 ms after stimulus presentation, between two EEG components that are predictive of decision accuracy [an &quot;early&quot; (170 ms) and a &quot;late&quot; (approximately 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.<p /><p>Language: en</p>",
language="en",
issn="0270-6474",
doi="10.1523/JNEUROSCI.1655-06.2006",
url="http://dx.doi.org/10.1523/JNEUROSCI.1655-06.2006"
}