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Hello,
In performing inverse dynamics I have two cases. The first is where muscles are enabled and the second is otherwise. The goal is from the HYOID neck model to plot the moments experienced by the joints during a flexion motion, however, I've found that having muscles enabled or disabled made no difference. Is this to be expected or a symptom of user error?

The Inverse Dynamics Tool calculates the net joint forces/moments required to generate a tracked movement. Muscle forces are not involved in this calculation so enabling or disabling muscles has no effect. Please refer to the "Inverse Dynamics" section of the User's Guide (https://simtk-confluence.stanford.edu:8 ... e+Dynamics) for more information.