Recent Issues. Chapter 12: The Behavior of Organisms at Fifty. Quote 15 Post author:B. F. Skinner Foundation Post published:April 19, 2019 Post category:Skinner's Quote of the Day “When a response was reinforced only in the presence of the light as an S Dee, the rat responded slowly in its absence (which, unfortunately, I called S Delta, hard to print) but responded immediately when the light came on.” (p. 127) You Might Also Like Cumulative Record. Chapter 4: The Design of Cultures. Quote 10 September 21, 2021 Cumulative Record: Definitive Edition (1999). Chapter 5: “Man”. Quote 7 April 12, 2021 Science and Human Behavior, Chapter 7: Operant Discrimination, Quote 23 May 13, 2016