Left TPJ activity in verbal working memory: Implications for storage- and sensory-specific models of short term memory
DOI: 10.1016/j.neuroimage.2010.12.021
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Summary
This study investigates the neural mechanisms of verbal working memory (VWM) to resolve a conflict between two theoretical models: the storage-specific account and the sensory-specific account. The storage-specific model posits a dedicated phonological buffer, typically localized to the left temporoparietal junction (TPJ), that is independent of speech perception. This view is supported by neuropsychological evidence showing that patients with left TPJ damage exhibit impaired verbal memory span but intact speech perception. Conversely, the sensory-specific model argues that memory maintenance relies on the same sensory regions used for perception, such as the superior temporal gyrus (STG). The authors aimed to determine which model is supported by neuroimaging data by examining whether the left TPJ or the left STG exhibits the functional profile of a dedicated memory store. To test these hypotheses, the researchers conducted an fMRI study with 17 participants using a slow, event-related design. Participants performed a serial-order recognition task involving either English letters (verbal condition) or Korean characters (object condition, chosen to lack phonological codes). The task manipulated memory load (high vs. low) and allowed for the independent assessment of encoding, maintenance, and retrieval phases. The authors defined three criteria for a region to act as a dedicated verbal store: it must be domain-specific (more active for verbal than non-verbal stimuli), delay-active (showing sustained activation during maintenance), and post-perceptual (located outside primary sensory areas). They analyzed activity in pre-specified regions of interest (ROIs) in the left TPJ and left posterior STG, as well as whole-brain contrasts. The results demonstrated that the left TPJ did not function as a dedicated storage buffer. While the left TPJ showed domain-specific activity during encoding and retrieval, it lacked sustained activation during the maintenance interval; its activity did not differ from baseline during the delay period. In contrast, the left posterior STG exhibited the expected profile of a store: it was more active for verbal than object stimuli and showed sustained activation during the maintenance phase. Whole-brain analyses confirmed these findings, identifying domain-specific activity in the left TPJ that failed to persist during maintenance, while the STG maintained activity throughout the delay. Behavioral data indicated that participants performed better on verbal trials, confirming the manipulation of stimulus type. These findings support the sensory-specific account of short-term memory, suggesting that verbal information is maintained in sensory-perceptual regions rather than a dedicated, post-perceptual buffer. The study concludes that the left TPJ is not a storage site for verbal information. Instead, the authors propose that the verbal memory deficits observed in patients with left TPJ damage may result from impaired attentional processes or retrieval mechanisms rather than a loss of storage capacity. This challenges the traditional view of a distinct phonological loop and aligns VWM mechanisms with those of other domains, such as visual working memory, which are generally considered sensory-specific.
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 | — | — | 7 | 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 | — | — | — | 5 | 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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