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Can Monkeys Choose Optimally When Faced with Noisy Stimuli and Unequal Rewards?
Figure 2
A typical state space of the LCA model, showing nullclines on which 
for 
(thin curves), fixed points (filled circles with arrows indicating stability types) and slow manifold (dashed line).
Diagonal solid line represents one-dimensional state space 
of reduced OU model, with associated probability distribution 
of sample paths.
doi: https://doi.org/10.1371/journal.pcbi.1000284.g002