Split-brain monkeys underwent either deep hemispheric disconnection or unilateral cortical ablations in an attempt to determine the neural mechanisms underlying ipsilateral eye-hand coordination. The results indicate that the responding hand is not in any direct way controlled by visual processes of the ipsilateral hemisphere. Instead, it is suggested that the target information crosses over to...

Let Γ denote a Q-polynomial distance-regular graph with diameter at least three and standard module V . We introduce two direct sum decompositions of V . We call these the displacement decomposition for Γ and the split decomposition for Γ. We describe how these decompositions are related.