Aachen Altar Aachen Altar The Aachen Altar (de: "Aachener Altar") or Passion Altar ("Passionsaltar") is a late gothic passion triptych in the Aachen Cathedral Treasury, made by the so-called Master of the Aachen Altar around 1515/20 in Cologne, Germany. The open, three winged polyptych altar image shows scenes from the Passion of Christ to his Ascension in continuous sequence from left to right. At the assumed time of composition, this type of depiction was already well-established. On the left wing of the altar, Jesus is crowned with the Crown of thorns and confronts Pontius Pilate. The central panel depicts the Stations of
Three-term contingency Three-term contingency The three-term contingency (also known as the ABC contingency) in operant conditioning describes the relationship between a behavior, its consequence, and the environmental context. The three-term contingency was first defined by B. F. Skinner in the early 1950s. It is often used within ABA to alter the frequency of socially significant human behavior. The antecedent stimulus occurs first in the contingency and signals that reinforcement or punishment is available on the contingency of a specific behavior. A discriminative stimuli, or S, directly affects the likelihood of a specific response occurring. The behavior, also referred to as the response,