Endogenous Rhythmic Movements

Endogenous rhythmic movements

A) are modulated solely in the primary and supplementary motor cortex.
B) are generated by central pattern generators.
C) in humans are modulated by the central pattern generator and the cerebral cortex but in other vertebrates, they are modulated only by the central pattern generator.
D) are generated by circuits within the spinal cord but cannot function independently of brain afferents.