BM-evoked IPSPs are abolished by CNQX and GABAa receptor antagonists but persist in decorticated slices. (A) BM-evoked IPSPs recorded before (Control, continuous lines) and after addition of CNQX (dashed lines) to the perfusate. (B) BM-evoked IPSPs recorded in a decorticated slice. Each sweep represents the average of 3 responses to stimuli applied at 8 different BM stimulation sites. (C) BM-evoked responses recorded before and after addition of picrotoxin to the perfusate. Three different LA neurons depolarized to -65 mV by injection of 0.03 (A), 0.07 (B) and 0.08 nA (C). Rest was -76, -84 and -86 mV, respectively.