This paper presents a critical philosophical inquiry into the impact of adaptive artificial intelligence and generative systems on human cognitive autonomy, digital memory, and historical consciousness. Moving beyond standard debates on the Extended Mind Thesis, the article introduces a key distinction between static cognitive tools and adaptive cognitive environments that actively reshape user behavior and agency. Extending Plato’s allegory into the digital era, it proposes the concept of the "Digital Cave Wall" to examine how algorithmically curated realities mediate identity, memory, and judgment. Rather than adopting technological pessimism, the paper outlines practical strategies such as cognitive liberty, positive friction, and transparent AI to preserve genuine human agency and independent thought in the algorithmic age.