EEG, Visual Working Memory, and Neural Reactivation: When Attention Reignites Space
EEG, Visual Working Memory, and Neural Reactivation: When Attention Reignites Space
Visual working memory is not a static cabinet inside the mind. It is a living, unstable space, sensitive to what happens in the external world. We look, store, wait, compare, and decide. But a fascinating question appears: can an irrelevant external stimulus reignite, inside memory, visual information that was being held internally?
The study by Fuentes-Guerra, Martín-Arévalo, van Ede, and González-García addresses exactly this question. The article investigated whether a spatial visual cue, even when irrelevant to the task, could work as a selective “ping” and reactivate visual working-memory contents that matched its spatial location. To test this, the researchers used EEG with temporally resolved multivariate decoding, observing whether visual categories held in memory reappeared in neural patterns before the memory test.
The scientific question can be stated as follows: can external spatial cues, noninformative and irrelevant to the task, involuntarily select internal contents held in visual working memory? This is a powerful question because it moves memory away from a purely voluntary model and toward a more dynamic view: the external world can enter the internal workspace of the mind and reorganize what is being maintained.
The study began with 35 volunteers, but the final sample included 25 participants after exclusions due to technical trigger issues, excessive EEG noise, or behavioral performance below 60%. Participants were between 18 and 35 years old, had normal or corrected-to-normal vision, and performed a complex visual task at the University of Granada.
The task was elegant. In each trial, participants saw two images, one on the left and one on the right. One image was always animate, such as a nonhuman animal, and the other was inanimate, such as a tool, vehicle, or household object. The images appeared inside colored placeholders, and participants had to memorize the association between color and motor response. Importantly, the animate/inanimate category was never relevant to the task.
After encoding, a fast spatial cue appeared: the border of one placeholder increased in thickness for 50 ms. This cue was nonpredictive, with 50% validity, and participants were instructed to ignore it. Even so, the cue could match the position of the item later tested, creating a congruent condition, or match the opposite position, creating an incongruent condition. Figure 1 of the article clearly shows this sequence: encoding, delay, spatial retro-cue, short interval, and central memory test.
EEG was recorded with a 63-channel BrainVision actiCHamp system, using active electrodes placed according to the international 10–20 system, sampled at 500 Hz, with Cz as the online reference, Fpz as ground, and acquisition through BrainVision Recorder. The data were later processed in MATLAB using FieldTrip and custom scripts. This is especially relevant for BrainLatam/Brain Support because it shows a robust EEG design compatible with studies of attention, memory, decision-making, and visual cognition.
The first result was behavioral. Participants responded faster when the tested item matched the previously cued location. Congruent trials had a mean reaction time of 678 ms, while incongruent trials had a mean reaction time of 715 ms, an average difference of 37 ms. Accuracy remained high and did not show a significant difference. This suggests that the cue did not simply make participants “more correct”; it accelerated access to relevant information.
The drift diffusion model analysis showed something even more interesting: the cueing effect was mainly explained by an increase in the drift rate, meaning faster or better evidence accumulation. In simple terms, when the cue matched the item later tested, the brain seemed to accumulate evidence more efficiently to reach the response. It was not only a faster motor response; it was an improvement in the quality of the decision process.
The heart of the article is the EEG analysis. The authors used MVPA over posterior electrodes to decode whether the reactivated item was animate or inanimate. The crucial point is that the spatial cue carried no information about animacy. It only indicated a location. Even so, after the cue, the neural pattern allowed the researchers to decode the category of the item that had been held at that location.
Neural reactivation appeared in a significant window from 128 to 520 ms after cue onset, over posterior electrodes. This is a strong finding: even before the central memory probe appeared, EEG already showed that the spatial cue had reignited the corresponding memory content. Figure 3 shows this temporal decoding and its posterior distribution, suggesting reactivation in a visual format.
The authors then analyzed ERPs at probe presentation, when the final item appeared for the memory test. They found two time windows of difference between congruent and incongruent probes: an early effect between 136 and 284 ms and a later effect between 536 and 756 ms. This suggests that the spatial cue not only reignited memory before the test but also changed how the brain processed the comparison stimulus afterward. Figure 4 shows these ERP effects over posterior electrodes.
The strength of this study is that it shows attention, perception, and memory are not separate systems. What is outside can touch what is inside. A seemingly irrelevant visual cue can work as a spatial key that reignites internal content. The mind is not a closed box; it is an active frontier between body, space, and world.
From the BrainLatam2026 perspective, this article speaks directly to the Damasian Mind. Visual memory does not appear as a pure abstraction, but as bodily orientation in perceived space. The brain does not store only “things”; it stores relations: where they were, how they were perceived, what response they required, and how they may return to guide action.
Here, APUS also enters as body-territory. Visual working memory is not only a mental image. It is a spatial organization of the body within the perceived territory. When an external cue touches a position, it reignites part of this internal territory. Space stops being a background and becomes a cognitive operator.
The avatar-lens for this blog can be Jiwasa, because the study shows synchrony between the external world and internal content. A stimulus outside the body communicates with a representation inside memory. Neural reactivation appears as a small encounter between environment and mind: shared agency between perception, attention, and memory.
This study also helps us think about Tensional Selves. A Tensional Self is not only an emotion or a thought. It is a temporary organization of attention, body, memory, and task. When the spatial cue reignites a representation, it shifts the internal focus and prepares a decision. In BrainLatam2026 terms, attention tensions part of the mental field and makes that content more available for action.
The BrainLatam2026 question would be: when attention reignites visual content, does it only improve memory, or does it also change the bodily state that prepares decision-making? To answer this, we could combine EEG + eye-tracking + fNIRS + HRV/RMSSD + respiration + GSR + facial or cervical EMG. EEG would show fast neural reactivation; eye-tracking would reveal attentional micro-shifts; fNIRS would observe prefrontal demand; HRV and respiration would show autonomic regulation; GSR would indicate salience; and EMG would show bodily micro-preparation.
A Latin American experimental design could adapt this task to more natural contexts: images of territory, faces, food, cultural objects, school symbols, urban scenes, and stimuli of belonging. The question would be: are contents with affective, territorial, or social value reignited more strongly by irrelevant spatial cues?
The generous decolonial critique is that much of visual memory neuroscience uses abstract stimuli or controlled image databases, which is necessary for experimental rigor. But real life is loaded with territory, affect, history, and belonging. BrainLatam2026 would expand the question: how do spatial, affective, and symbolic cues reignite memories in a child at school, an athlete, a musician, a young person on social media, or communities exposed to fear and insecurity?
The bridge with DREX Cidadão appears when we remember that attention and memory are also shaped by social safety. A body under fear, debt, hunger, or constant threat may have its working memory captured by risk cues. A body with belonging, stability, and Zone 2 can use attention to explore, learn, and update the world with more freedom. Public policy also decides what kind of mental space a population is able to sustain.
Closing
This study shows that visual working memory is not isolated from the world. External space can reignite internal representations, and EEG allows us to observe this reignition in real time. For BrainLatam2026, this is very powerful: memory is body, attention, and territory in motion. When attention reignites space, the mind shows that remembering is not storing; it is reorganizing the present in order to act.
Single Reference
Fuentes-Guerra, Á., Martín-Arévalo, E., van Ede, F., & González-García, C. (2026). Exogenously Driven Neural Reactivation of Spatially Matching Visual Working-Memory Contents. eNeuro, 13(4). doi:10.1523/ENEURO.0076-26.2026.
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