Charles Yneu Yang, An International Comparison of Consumption Functions, The Review of Economics and Statistics, Vol. 46, No. 3 (Aug., 1964), pp. 279-286 ...

(b) Graphs show the time courses of fEPSP slope changes induced by TB5 and TB10 stimuli in mice drinking tap water (‘water’, left graph, n =19) or ethanol (‘ethanol’, right graph, n =15).