The Shared and Unique Neural Correlates of Personal Semantic, General Semantic, and Episodic Memory
Bibliographic record
Abstract
One of the most common distinctions in long-term memory is that between semantic (i.e., one’s general knowledge of the world) and episodic (i.e., recollection of contextually-specific events from one’s personal past). However, emerging cognitive neuroscience data suggest a surprisingly large overlap between the neural correlates of semantic and episodic memory. Moreover, personal semantic memories (such as knowledge of autobiographical facts or memory for repeated events) have been studied little and do not easily fit into the standard semantic-episodic dichotomy. Here we used fMRI to directly compare brain activity during general and personal semantic, and episodic processing. Forty-eight participants were scanned while they verified statements concerning general facts, autobiographical facts, repeated events, and unique events. In multivariate analysis (i.e., Partial Least Squares), all four types of memory involved activity within the same network of brain regions bilaterally: frontal pole, paracingulate gyrus, medial frontal cortex, middle and superior temporal gyrus, precuneus, posterior cingulate, angular gyrus, superior lateral occipital cortex, also the left parahippocampal gyrus and left hippocampus. Yet the four memory types differentially engaged this network, increasing in activity from general to autobiographical facts, from autobiographical facts to repeated events, and from repeated to unique events. These neuroimaging data, and complementary behavioral data obtained outside the scanner, are inconsistent with a strict separation of declarative memory systems. Rather, they are compatible with a component process model, in which semantic, personal semantic, and episodic memory rely on different weightings of elementary processes, such as sensory-perceptual imagery, spatial and temporal features, and self-reflection.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".