The mammal brain re-organizes it's function at three months into paired modalities
According to Luria, at three months after birth, in the human brain there is a re-organization of function. Now the modalities establish communication between themselves, and begin to work in pairs.
We see here a change in the behavior of the child. Eye-hand motor coordination is a notable sequel of this advanced neuro-wiring. That is not to say that this advantage is lacking in most other mammals. Good eye-hoof (horses & deer), eye-paw (dogs & cats) eye-hand (monkeys & apes) and eye-trunk (elephants and porters) coordination is essential for survival.
We have already discussed how initially, the proximal modalities almost exclusively will be used by the child to explore his/her environment.
The cross modality associations between this haptic input and the simultaneous input of the distal modalities is critical if hearing and vision are to become optimally functional.