Over a period of successive presentations, the volume of the recording would be slowly increased, all the while providing positive stimuli. (animalbehaviorsociety.org)
Like humans, monkeys naturally associate members of their «in - group» with positive stimuli such as fruits, and out - group members with negative stimuli such as spiders. (newscientist.com)
The process only involves pairing the very positive stimulus (the yummy food) with the scary tool / person / situation. (groomingbusiness.com)