Sentence:  These are few and seemingly disjointed data , but they illustrate the important fact that fundamental alterations in <WSD>conditioned</WSD> reactions occur in a variety of states in which the hypothalamic balance has been altered by physiological experimentation , pharmacological action , or clinical processes . 
Meaning of the word marked with <WSD> tags:  an acquired response that is under the control of (conditional on the occurrence of) a stimulus