Biological Constraints on Reading and Writing Acquisition
The human brain probably contains more than 1014 synapses, and there are simply not enough genes to account for this complexity.
- Jean-Pierre Changeux, cited by Barnes ( 1986)
So within genetic constraints, extragenetic factors can influence the number and details of synaptic contacts in the cortex.
- Pasco Rakic, cited by Barnes ( 1986)