NarraSpace: Multimodal Scene-Grounded Evidence for Picture-Description Dementia Classification

Qingming Li, Ruiyan Sun, Satoshi Nakamura · 2026 · arXiv

DOI: 10.48550/arXiv.2610.28616 · open-access PDF

Abstract

Picture-description dementia classification uses a shared visual scene, but a transcript-level prediction alone does not identify the scene evidence underlying its inputs. NarraSpace links words and speech times to named picture elements and retrieves utterances for predefined scene events. Narrative-spatial descriptors summarize coverage and temporal organization. A frozen language model contrasts each event's text under examples from Alzheimer's disease and healthy-control training participants, alongside transcript surprisal and coverage measurements. Retained source records link event scor

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