The literature cluster converges on a central mechanistic theme: synaptic structural integrity—governed substantially by the actin cytoskeleton—as the proximate substrate linking molecular pathology to the memory and cognitive deficits of Alzheimer's disease (AD). Actin organizes synaptic vesicle trafficking in the presynapse, modulates dendritic spine morphology and postsynaptic density organization in the postsynapse, and anchors neurotransmitter receptors, thereby regulating neurotransmitter release and neural communication at the synapse. This positions actin-driven structural plasticity as a upstream determinant of synaptic plasticity, long-term potentiation, and neurogranin-mediated postsynaptic signaling—processes whose disruption is repeatedly tied to memory encoding, consolidation, and recall failures. Techniques such as optical Kerr effect spectroscopy applied across hippocampus, Brodmann area 9, and Brodmann area 17 suggest an emerging biophysical/structural approach to quantifying tissue-level cytoskeletal or viscoelastic changes as candidate biomarkers of regional vulnerability.
A second, complementary trajectory concerns the systems-level and psychosocial architecture of memory in AD, centered on autobiographical memory as a construct linking hippocampal-cortical circuitry (frontal cortex, parietal cortex, amygdala) to identity, self-perception, and psychosocial functioning. Autobiographical memory decline is framed not merely as a cognitive symptom but as a disruptor of personal narrative and identity continuity, motivating a translational shift toward non-pharmacological, person-centered interventions—multisensory stimulation, narrative reconstruction, immersive approaches, and digital tools—developed as "integrative methodologies" that also support patient autonomy. Family caregivers emerge as active mediators of shared memory processes and identity continuity, reflecting a broader trend of embedding caregiving relationships into therapeutic and supportive frameworks rather than treating cognition in isolation.
Together, these threads outline a bridging trend: mechanistic, molecular-level synaptic/cytoskeletal research (actin, neurogranin, dendritic spines, postsynaptic density) is increasingly being contextualized alongside higher-order, circuit- and psychosocial-level memory constructs (autobiographical memory, identity, caregiver-mediated support). This dual-track approach—molecular structural biology of the synapse paired with narrative/psychosocial memory science—signals a maturing field seeking both disease-modifying therapeutic targets (e.g., neurogranin, actin-regulated synaptic pathways) and holistic, quality-of-life-oriented interventions. The convergence suggests future AD research and care models will increasingly integrate biomarker-level structural assays with digitally enabled, narrative-based interventions that jointly address synaptic decline and its downstream impact on self and social identity.