Reactivating ordinal position information from auditory sequence memory in human brains

Fan, Ying; Luo, Huan

doi:10.1101/2022.04.04.487064

Cited by 3 publications

(2 citation statements)

References 86 publications

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“…Here we show that within the same auditory categorization task, the past “event-file” is implicitly imprinted in WM and automatically passed to the next “event-trial” in a feature-encapsulated way. Importantly, not any events can trigger past information, also in line with previous findings 46, 47 . For instance, white noise, despite being an auditory sound within the same sensory modality, failed to reactivate prior pitch and category information, and previous motor response, although apparently retained in WM, could not be triggered by either white noise or tone stimulus.…”

Section: Discussionsupporting

confidence: 89%

“…Interestingly, information could also be retained within synaptic weights of WM networks via short-term neural plasticity principles and thus in an 'activity-silent' way [12][13][14][15][16][17] . However, recent studies suggest that the 'activity-silent' mode could only passively maintain information 13 (including ours, see ref [45][46][47] ), and memory manipulation still relies on the reactivations of WM to active states 19,20 . As a consequence, for serial bias to occur, the past WM traces, retained either actively or silently, should encounter the current inputs in the time to alter the present.…”

Section: Discussionmentioning

confidence: 71%

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Co-occurrence of past and present shifts current neural representations and mediates serial biases

Zhang

Luo

2022

Preprint

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The regularities of the world render an intricate interplay between past and present. Even across independent trials, current-trial perception can be automatically shifted by preceding trials, namely the 'serial bias'. Meanwhile, the neural implementation of the spontaneous shift of present by past that operates on multiple features remains unknown. In two auditory categorization experiments with human electrophysiology recordings, we demonstrate that serial bias arises from the co-occurrence of past-trial neural reactivation and the neural encoding of current-trial features. The meeting of past and present shifts the neural representation of current-trial features and modulates serial bias behavior. Critically, past-trial features (i.e., pitch, category, motor response) that constitute an 'event-file' keep their respective identities in working memory and are only reactivated by the corresponding features in the current trial, giving rise to dissociated feature-specific serial biases. This 'event-file' reactivation might constitute a fundamental mechanism for adaptive past-to-present generalizations over multiple features.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 71%

Co-occurrence of past and present shifts current neural representations and mediates serial biases

Zhang

Luo

2022

Preprint

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Electrophysiological hallmarks for event relations and event roles in working memory

Zhu

et al. 2023

Preprint

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The ability to maintain events (i.e. interactions between/among objects) in working memory is crucial for our everyday cognition, yet the format of this representation is poorly understood. The current ERP study was designed to answer two questions: How is maintaining events (e.g., the tiger hit the lion) neurally different from maintaining item coordinations (e.g., the tiger and the lion)? That is, how is the event relation (present in events but not coordinations) represented? And how is the agent, or initiator of the event encoded differently from the patient, or receiver of the event during maintenance? We used a novel picture-sentence match-across-delay approach in which the working memory representation was "pinged" during the delay, in two ERP experiments with Chinese and English materials. First, we found that maintenance of events elicited a long-lasting late sustained difference in posterior-occipital electrodes relative to non-events. This effect resembled the negative slow wave reported in previous studies of working memory, suggesting that the maintenance of events in working memory may impose a higher cost compared to coordinations. Second, in order to elicit a hallmark for agent vs. patient representation in working memory, we pinged agent or patient characters during the delay. Although planned comparisons did not reveal significant differences in the ERPs elicited by the agent pings vs. patient pings, we found that the ping appeared to dampen the ongoing sustained difference, suggesting a shift from sustained activity to activity silent mechanisms. These results represent one of the uses of ERPs to elucidates the format of neural representation for events in working memory.

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Maintenance of colour memoranda in activity-quiescent working memory states: Evidence from impulse perturbation

Kandemir

Wilhelm

Axmacher

et al. 2023

Preprint

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The neural mechanisms by which information is maintained in working memory are challenging to study, as such maintenance is not always correlated with detectable sustained neural activity. Perturbation of the memory network with a visual impulse has proven useful to probe memoranda in such activity-quiescent states. However, the impulse perturbation approach has so far been applied exclusively to spatially localized or spatially referenced stimuli, such as orientations or tone frequencies. It is unknown whether the neural maintenance mechanisms of non-spatial memoranda would be analogous. In the present study we therefore applied the impulse perturbation method to working memory for colours, which are intrinsically non-spatial stimuli, focusing on a set of pre-registered analyses. We analysed the EEG data of 30 participants who completed a delayed match-to-sample working memory task, in which one of the two items that were presented was retro-cued as task-relevant. We assessed the colour space underlying memory maintenance, and found that both cued and uncued colours were decodable from impulse-evoked activity, the latter in contrast to previous reports of working memory for orientation gratings. We furthermore examined colour decoding from ongoing oscillations in the alpha band, and found that cued items could be decoded therein, whereas uncued items could not, which might be mediated by attention. Overall, the outcomes suggest that subtle differences exist between the representation of colours and that of stimuli with spatial properties, but the present results also demonstrate that regardless of their specific neural state, both are accessible through visual impulse perturbation.

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Reactivating ordinal position information from auditory sequence memory in human brains

Cited by 3 publications

References 86 publications

Co-occurrence of past and present shifts current neural representations and mediates serial biases

Co-occurrence of past and present shifts current neural representations and mediates serial biases

Electrophysiological hallmarks for event relations and event roles in working memory

Maintenance of colour memoranda in activity-quiescent working memory states: Evidence from impulse perturbation

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