TY  - JOUR
PY  - 2006//
TI  - Neural representation of task difficulty and decision making during perceptual categorization: a timing diagram
JO  - Journal of neuroscience
A1  - Philiastides, Marios G.
A1  - Ratcliff, Roger
A1  - Sajda, Paul
SP  - 8965
EP  - 8975
VL  - 26
IS  - 35
N2  - 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 "early" (170 ms) and a "late" (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> 
LA  - en
SN  - 0270-6474
UR  - http://dx.doi.org/10.1523/JNEUROSCI.1655-06.2006
ID  - ref1
ER  -