Geraniums have been popular garden perennials for a long time, and have lots of devotees. Consequently, there are lots of good sources of information on the internet. A good start is provided by the Open Directory Project's geranium category. For a primer on erodiums, this page from the UK gives a good overview.
Stimulus control is the phenomenon of a stimulus increasing the probability of a behavior (operant response) because of a history of that behavior being differentially reinforced in the presence of the stimulus.
â¢ Stimulus is the first event that takes place, and the response is the result. â¢ A stimulus could be of any magnitude, but the response could never go beyond the highest capability of an organism. â¢ Stimulus cannot be always controlled, especially the external stimuli, whereas response could be controlled.