Summary of phasic response in GABA neurons.

<p>GABA neurons show the same pattern of modulation as DA neurons. (<b>a</b>) The phasic response to the reward cue of increasing GABA neurons (<i>n</i> = 68) was higher for the second half of FT60 sessions than it was for the first half. Decreasing GABA neurons (<i>n</i> = 138) showed the opposite pattern. The phasic response of unmodulated neurons (<i>n</i> = 66) did not change. Modulation of the phasic response was reduced by pre-feeding (<b>b</b>; <i>n</i> = 15 increasing, 24 decreasing, 33 unmodulated) and eliminated during extinction (<b>c</b>; <i>n</i> = 7 increasing, 4 decreasing, 73 unmodulated). The phasic response of increasing neurons was nearly abolished following pre-feeding and during extinction, and the phasic response of decreasing neurons was abolished during extinction.