a, b, Example traces (left) and statistics (right, sampled within 3 min before and 1 min after drug application) showing effects of AMPA (a) or picrotoxin (b) on spontaneous bursts in the LHb. n = 8 neurons, 2 rats (a); n = 6 neurons, 3 rats (b). Data are mean ± s.e.m.; *P < 0.05, ***P < 0.001. Two-tailed paired t-test.