A, superfusion of ethanol (40, 80 or 120 mm) for 10 min increased evoked GABAA IPSC amplitude in both representative ISS and ILS mice. B, mean percentage increase in GABAA IPSC amplitudes showed differences in ethanol responses: ILS IPSCs were more sensitive to ethanol than those from ISS mice. Number of neurons for each ethanol concentration: 40 mm, n = 5; 80 mm, n = 6; 120 mm, n = 7, in ISS mice; and 40 mm, n = 5; 80 mm, n = 7; 120 mm, n = 6 in ILS mice. Scale for A, 50 ms, 25 pA.