Williamson’s assemblage is based on the fact that the brain is permeable to its social, material and technical surroundings. Do read the original paper as it describes the rich context in which this analysis has developed, from biosocial studies to posthumanism, and how it is now used in post-digital studies. Here is a short description of the three codes. 

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"Biological codes consist of bodily materials, such as genetic codes and the chemicals, cells, neurons, synapses, nervous systems and neural networks that constitute the organ of the brain. These neurobiological codes are not entirely ‘natural’ categories, but themselves the codified knowledge of specific expert disciplinary practices, classifications and categories generated by scientists. Thus, whilst biological codes consist of embodied material, they are readable and intelligible only via scientific lenses and disciplinary vocabularies. Computer codes include digitally coded software, computer hardware, networked systems and algorithms. Again, the codes that enact these technologies, written in specific programming languages, are the product of technical specialists working in dedicated settings, with project plans, business objectives and research questions to address. Finally, social codes, or codes of conduct, consist of the governing norms, rules, regulations and power relations that pervade environments and structure human action, cognition and affects. These social codes of conduct are the product of experts and authorities that seek to guide, manage or govern human conduct for certain ends. They include but are not confined to official government policies in a context where governance has increasingly dispersed to a range of international organisations, think tanks, commercial companies and philanthropic institutions, particularly those offering or promoting technologies that can modify, shape or influence conduct in ways informed by scientific expertise. These social codes are also animated by imaginary neurofutures of the kinds of societies that could or ought to be attained through neurotechnology application across a range of domains. Indeed, as studies of both neuroscience and software insist, imagined futures infuse both scientific inquiry and technical innovation." (williamson, 2019, pp. 10-11)