The document discusses information processing theory, emphasizing the brain's function as an information processor akin to a computer, focusing on encoding and retrieval. It covers various models, including Atkinson and Shiffrin's 'stage theory' and Craik and Lockhart's 'level of processing' model, highlighting different mechanisms that influence information access and application. Additionally, it mentions Rumelhart and McClelland's connectionist model, which suggests that information is stored in interconnected brain networks, affecting retrieval ease.