Creatures: Artificial Life Autonomous Software Agents for Home Entertainment

https://www.sussex.ac.uk/informatics/cogslib/reports/csrp/csrp434.pdf

About 1,000 neurons in 9 lobes and 5,000 synapses; concept space of about 640 cells; 16-cell decision layer, strongest cell acts; drive reduction releases reward and drive increase releases punishment chemicals that reinforce synapses; 256 chemicals with gene-defined reactions; haploid genome of about 320 genes; crossover at gene boundaries with omission, duplication, and mutation; genes switch on at set ages.

Creature learning, Trait inheritance