Full Idea
Causation in the material world works by energy transfer of some sort: transfer of motion, of electrical energy, of gravitational force.
Gist of Idea
Causation in the material world is energy-transfer, of motion, electricity or gravity
Source
Colin McGinn (The Mysterious Flame [1999], p.92)
Book Reference
McGinn,Colin: 'The Mysterious Flame' [Basic Books 1999], p.92