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Endogenous
This general term refers to factors within a given organism rather than those external to that organism. Compare with Exogenous.
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Exogenous
This general term refers to factors external to a given organism rather than those within that organism. Compare with Endogenous.
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Kinesis
Random, undirected movement. Compare with Taxis.
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Taxis
Movement whose direction is determined in relation to a stimulus. Compare with Kinesis.
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Zeitgeber
An environmental agent (such as light or temperature) that entrains an individual's behavior to that environment. Zeitgeber is German for "time-giver."