noun. with regard to Pavlovian conditioning, a lessening in conditioning with one conditioned stimulant because of the existence of another conditioned stimulant. Generally a more powerful stimulant will overshadow a less-than-strong stimulant.

OVERSHADOWING: "It is obvious that overshadowing played a big role in the tainting of this experiment's results."
Cite this page: N., Pam M.S., "OVERSHADOWING," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/overshadowing/ (accessed September 27, 2021).