About: http://webisa.webdatacommons.org/292412122

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	One issue was whether or not the state produced by drugs such as morphine which, in turn, increased pressing for direct electrical stimulation of brain produced a state that was, in turn, capable of establishing a place preference.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com