Temporal Grouping Effects in Immediate Recall: A Working Memory Analysis
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Summary
This paper investigates the cognitive mechanisms underlying the "temporal grouping effect," where inserting pauses into a sequence of items significantly improves immediate recall. The authors analyze this phenomenon through the lens of Baddeley’s working memory model, specifically testing whether temporal grouping relies on the central executive (a general workspace) or the phonological loop (a subsystem for maintaining speech-based information). The study aims to resolve conflicting hypotheses regarding whether grouping affects abstract working memory buffers or specific rehearsal strategies. The research comprises four experiments manipulating presentation modes, concurrent tasks, word length, and phonemic similarity. Experiment 1 examined visual lists of letters under three conditions: control, articulatory suppression (repeating "blah"), and reciting random digits (loading both the phonological loop and central executive). Experiment 2 varied word length (1, 3, and 5 syllables) and grouping patterns to test if grouping benefits are time-based, as predicted by the phonological loop’s decay properties. Experiment 3 replicated the concurrent task manipulation with auditory lists, while Experiment 4 manipulated phonemic similarity to further isolate phonological processes. The results indicated that the temporal grouping effect for visual lists was eliminated by both articulatory suppression and reciting random digits in Experiment 1, suggesting reliance on the phonological loop rather than the central executive. However, Experiment 2 revealed that the grouping effect was insensitive to word length; recall benefits remained consistent regardless of whether items were short or long, contradicting the prediction that grouping should be constrained by the time-based capacity of the rehearsal loop. Similarly, Experiment 4 showed insensitivity to phonemic similarity. Notably, Experiment 3 found that articulatory suppression did *not* remove the grouping effect for auditory lists, indicating a modality-specific difference in how grouping operates. The authors conclude that while concurrent articulation implicates the phonological loop, the standard working memory model is insufficient to explain the insensitivity of grouping effects to word length and phonemic similarity. To address these discrepancies, the paper proposes a connectionist model of the phonological loop involving a "context timing signal." This computational account suggests that pauses during list presentation affect the timing signal similarly to the initial pause before presentation, offering a more precise mechanism for how temporal structure enhances memory without being constrained by the acoustic properties of the items.
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via author_sweep_intake on 2026-05-28.
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | author_sweep | — | — | 2 | 2026-05-28 |
| archive | success | canonical_url | — | — | 4 | 2026-06-09 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | clean | — | — | 1 | 2026-06-09 |
| chunk | success | chunk | — | — | 1 | 2026-06-09 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-09 |
| enrich | failed | — | — | — | 4 | 2026-07-02 |
| promote | success | — | — | — | 1 | 2026-06-04 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 8 | 2026-06-11 |
| verify | success | — | — | — | 1 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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