Words can outcompete reality. When Katie becomes absorbed in a book, the likely explanation is not that her senses stop working, but that attention gives the imagined events priority over competing sights and sounds. The page wins temporarily. Psychologists call this selective attention: the brain favors some information while other inputs receive less processing or fail to enter conscious awareness.
Reading is active construction. As Katie recognizes words and connects their meanings, working memory holds information long enough to link a sentence with what came before, while stored knowledge supplies context that the author leaves unstated. Print becomes imagined experience. Research on reading suggests that descriptions of actions and sensations can engage some systems associated with those experiences, although imagining an event is not identical to perceiving it. Suspense tightens the grip. When a story raises a question she wants answered, each new sentence offers information that keeps attention directed toward the book.
Absorption has its limits. Narrative transportation, the psychological experience of becoming mentally involved in a story, can combine imagery, emotion, and focused attention, making unrelated activity less likely to interrupt the reader's train of thought. Not every book succeeds. Interest, reading fluency, fatigue, and the surrounding noise all affect how readily someone becomes immersed, so Katie's experience cannot be explained by a single mechanism without knowing more about her circumstances. The silence is selective. A sudden disturbance may still pull her back, but until then, the room remains present without being the place where her thoughts are living.