Managing Your Work Environment > Setting Preferences > General Preferences > 
Animation
 
 
 

Use the Animation area to set the default interpolation and extrapolation modes for setting keyframes. See Setting Interpolation and Setting Extrapolation.

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Default Interpolation boxSet the default interpolation type to be Constant, Linear, Hermite, or Natural.

Default Extrapolation boxSet the default extrapolation type to be Constant, Linear, Cycle, or Rev/Cycle.