Selective Network Suppression as a Mechanism of Paradoxical Lucidity in Alzheimer's Disease

Paradoxical lucidity (PL) describes unexpected episodes of meaningful, coherent communication or connectedness in people with severe neurodegenerative dementia who are believed to have permanently lost those capacities. Prior work supports network-level accounts of PL, demonstrates that memory failure in experimental Alzheimer’s disease (AD) can include retrieval failure rather than complete erasure, and establishes that AD may involve network hyperexcitability, abnormal oscillations, seizures, and subclinical epileptiform activity.The Selective Network Suppression Hypothesis (SNSH) proposes that, in a biologically defined subset of dementia, maladaptive hyperexcitable or epileptiform activity may actively interfere with residual cognitive networks. The hypothesis predicts a temporal sequence in which attenuation or reorganization of pathological activity precedes improved large-scale coordination and objectively verified lucid behavior; loss of that favorable network state should accompany or precede the end of lucidity.SNSH is presented as a testable, subgroup-specific mechanistic hypothesis and is complementary to engram, neuromodulatory, perfusion, and network-reintegration accounts of paradoxical lucidity.