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. Author manuscript; available in PMC: 2012 Jul 3.
Published in final edited form as: SIAM J Appl Dyn Syst. 2011;10(1):148–188. doi: 10.1137/090770096

Figure 1.

Figure 1

Contour maps of network performance over the glutamatergic (γE) and GABA-ergic (γI) gain modulation plane. (a) Reward rate RR: ridge of higher rewards has slope ≈ 2 near γE = γI = 1.0 that moderates to ≈ 1 at higher gains. (b) Fraction of rewarded trials 〈Acc〉: note steeper drop above the ridge, where good performance yields to no-choice trials, and shallower drop below, where impulsive trials begin. (c) Mean decision time 〈DT〉: inhibition dominates at upper left causing no-choices (aborted after 2000 ms, red shades); excitation dominates at lower right causing fast impulsive trials (blue shades).