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𝐅𝐚𝐯𝐨𝐫𝐢𝐭𝐞 𝐛𝐨𝐨𝐤 𝐨𝐟 𝟐𝟎𝟐𝟏
Wimsatt (2007): Re-Engineering Philosophy for Limited Beings: Piecewise Approximations to Reality
4) Basically, Waddington's landscape is not viewed as fixed and needs to define itself during the process. So it's "not there a priori". Kind of mind bending!
Re. discussions about the PAG and brainstem and giving justice to their complexity, here's a figure that emphasizes *bidirectional* connectivity with lots of regions: the PAG is not a descending outflow station.