Downward causation and the neurobiology of free will

I'm now reading Downward Causation and the Neurobiology of Free Will, a copy of which is at the link. They acknowledge and address two main critics of the premise, Libet and Weger. Libet did experiments where there was a delay between an action and our conscious awareness of "willing the action." Weger brings in severed right/left brain research, among other things. The chapters in the book address this research which both concur with and dispute them in varying degrees. More later.