The second orthogonal dimension with which we could organize short-term adaptation is the degree of stimulus independence exhibited by the phenomenon.
Behavior can be seen to vary from a discrete response to a punctate stimulus, to an extended series of behaviors to a likewise punctate stimulus.
Under some conditions, a simple stimulus produces a simple response.
A more complex situation is when a stimulus controls a response, which in turn produces the next stimulus, which in turn produces the next response.
A single stimulus can also produce an extended sequence of behaviors without intermediate stimulus support.
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