Not such a unifying hypothesis?
Lemon
R
R
Ugolini
G
G
Edgley
S
S
D000818:Animals; D002415:Cats; D002540:Cerebral Cortex / Q000166:cytology* / Q000502:physiology; D000882:Haplorhini; D006801:Humans; D008124:Locomotion / Q000502:physiology*; D009434:Neural Pathways; D009847:Olivary Nucleus / Q000166:cytology* / Q000502:physiology; D051381:Rats; D013116:Spinal Cord / Q000166:cytology* / Q000502:physiology