excitation vs sensitivity

excitation

noun
  • The activity produced in an organ, tissue, or part, such as a nerve cell, as a result of stimulation 

  • The act of exciting or putting in motion; the act of rousing up or awakening. 

  • The act of producing excitement (stimulation); also, the excitement produced. 

  • A transition of a nucleus, atom or molecule to an excited state by the absorption of a quantum of energy; the opposite of relaxation 

sensitivity

noun
  • The ability of an organism or organ to respond to external stimuli. 

  • The degree of response of an instrument to a change in an input signal. 

  • The degree of response of a film etc. to light of a specified wavelength. 

  • The quality or state of being sensitive; sensitiveness. 

  • Vulnerability to medical treatment: Synonym of susceptibility. 

  • The probability, in a binary classification test, of a true positive being correctly identified. 

How often have the words excitation and sensitivity occurred in a corpus of books? (source: Google Ngram Viewer )