Consciousness is not the product of a special network that enables all of our mental events to be conscious. Instead, each mental event is managed by… - Michael S. Gazzaniga

The computer scientists Jeff Clune, Jean-Baptiste Mouret, and Hod Lipson did what computer scientists do: they designed computer simulations.23 They used well-studied networks that had sensory inputs and produced outputs. What those outputs were determined how well the network performed when faced with environmental problems. They simulated twenty-five thousand generations of evolution, programming in a direct selection pressure to either maximize performance alone or maximize performance and minimize connection costs. And voilà! Once wiring-cost-minimization was added, in both changing and unchanging environments, modules immediately began to appear, whereas without the stipulation of minimizing costs, they didn’t. And when the three looked at the highest-performing networks that evolved, those networks were modular. Among that group, they found that the lower the costs were, the greater the modularity that resulted. These networks also evolved much quicker — in markedly fewer generations — whether in stable or changing environments. These simulation experiments provide strong evidence that selection pressures to maximize network performance and minimize connection costs will yield networks that are significantly more modular and more evolvable.

Young children by age three begin to inhibit some of their naturally altruistic behavior. They become more discriminating about whom they help. They share more often with others who have shared with them in the past.

During replication, those nucleotides are read and translated into linear strings of amino acids (which make up enzymes and proteins) by a rule-governed process. The set of rules is called the genetic code. The DNA contains the sequence, but the code is implemented by RNA molecules. Certain DNA sequences, called codons, which are made up of three nucleotides, symbolize certain amino acid sequences. There is no ambiguity, but there is also not just one codon for each amino acid. For example, six different codons symbolize arginine, but only one codon symbolizes tryptophan. But the components of the DNA sequence (the symbol) do not resemble the components of the amino acid sequence (its meaning), just as the words that symbolize the components of a recipe do not resemble the components themselves.