“…More often an analysis of multi-unit recordings in a variety of species has been made either in vivo (Zamiatina, 1957;Sharma & Nasset, 1962;Andrews & Andrews, 1971;Itina, 1971;Andrews, Andrews & Orbach, 1972;Hardcastle, Hardcastle & Sanford, 1978, 1980 or in vitro (Sirotin, 1961;Clothier, Green, Hardcastle, Hardcastle & Sanford, 1975;Sanford, 1976). Multi-unit records do not determine whether there is selective sensitivity (specificity) of particular enteroreceptors.…”