Overview

This simple book introduces the idea of a Personal Cognitive Twin-a new kind of AI designed to understand and support how you think. Unlike typical AI systems or digital twins, a PCT is built to learn your unique reasoning style, preferences, and decision-making habits over time, while keeping your data private and secure. We lay out the first full definition and framework for these systems, including the math behind them and a roadmap for future research. At the heart of it is PCT-Net, a unified architecture that brings together personal knowledge graphs, behavioral patterns, cognitive modeling, and learning directly on your device. We also take a hard look at why existing approaches-like cognitive architectures, user modeling, and personal AI-haven't quite nailed the idea of a truly personal cognitive model. This book sets the foundation for a new field: personal cognitive computing.

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