Cognitive Frameworks

Welcome to Lecture 6 of Human Computer Interaction (CS408), focusing on Cognitive Frameworks. Cognition encompasses the mental processes that occur inside our heads during everyday activities, including thinking, remembering, learning, daydreaming, making decisions, and interacting with computing systems. Donald Norman distinguishes between two primary modes of cognition: experiential cognition and reflective cognition. Experiential cognition represents a state of mind where people perceive, act, and react to external events effortlessly, efficiently, and automatically, requiring extensive practice and expertise like driving a car or reading a familiar digital menu. Conversely, reflective cognition demands conscious mental effort, active comparison, critical thinking, and decision-making, which triggers creative problem-solving and the development of new conceptual models. Classical HCI relies heavily on the information processing framework, conceptualizing the human mind analogously to a computer system. Sensory stimuli enter through perceptual receptors, undergo encoding and comparison, progress to response selection, and terminate in response execution. Card, Moran, and Newell formalized this through the Model Human Processor (MHP), which integrates perceptual, cognitive, and motor processors, each characterized by measurable cycle times and memory capacities. Building upon this, the GOMS model analyzes tasks through Goals (what the user desires to achieve), Operators (fundamental physical or mental actions), Methods (learned sequences of operators), and Selection rules (heuristics for choosing between alternative methods). A streamlined subset, the Keystroke-Level Model (KLM), enables designers to quantitatively predict expert execution times for routine computer tasks. Beyond internal processing, modern cognitive theory embraces external cognition, exploring how users exploit external representations to alleviate internal memory load. Key mechanisms include cognitive offloading, computational offloading, annotating, and cognitive tracing. Furthermore, distributed cognition models examine how information processing is spread across individuals, artifacts, and external representations. Virtual University students preparing for midterm examinations will find these principles frequently tested in CS408 solved MCQs by Moaaz, Waqar Siddhu past papers, and university handouts pdf files. Mastering GOMS operators, execution bottlenecks, and cognitive offloading guarantees academic success across all CS408 quiz assessments and university semester evaluations.