Cayman Islands Map on It can refer to different responses occurring in the presence of different stimuli or to differences in the rate, temporal organization, or physical characteristics of a single response in the presence of different stimuli. stimulus discrimination the ability to distinguish among different stimuli (e.g., to distinguish a circle from an ellipse) and to respond differently in the presence of such. stimulus generalization the spread of effects of conditioning (either operant or Pavlovian) to stimuli that differ in certain aspects from the stimulus present during original conditioning. For example, a dog conditioned to bark when a particular bell sounds tends to bark to bells of any pitch. stimulus onset asynchrony the time between the onset of one stimulus and the onset of the following stimulus. Cayman Islands Map 2016.