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.
stimulus. n, pl-li (-ËlaÉª; -ËliË). 1. something that stimulates or acts as an incentive. 2. (Physiology) any drug, agent, electrical impulse, or other factor able to cause a response in an organism.3. (Psychology) an object or event that is apprehended by the senses.4. (Pharmacology) med a former name for stimulant.timulus. n, pl-li (-ËlaÉª; -ËliË). 1. something that stimulates or acts as an incentive. 2. (Physiology) any drug, agent, electrical impulse, or other factor able to cause a response in an organism.