Full Idea
Human organisms have non-redundant causal powers, and so can exercise downward causation.
Clarification
A causal power is 'redundant' if something else also does the job
Gist of Idea
Human organisms can exercise downward causation
Source
Trenton Merricks (Objects and Persons [2003], §4.VII)
Book Reference
Merricks,Trenton: 'Objects and Persons' [OUP 2003], p.116
A Reaction
The hallmark of property dualism. This notion needs a lot more expansion and exploration than Merricks gives it, and I don't think it will be enough to provide 'free will', or even, as Merricks hopes, to place humans in a distinct ontological category.