Representation of visual numerosity information during working memory in humans: An fMRI decoding study
| Autor: | Pennock, Ian Morgan Leo, Schmidt, Timo Torsten, Zorbek, Dilara, Blankenburg, Felix |
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| Rok vydání: | 2021 |
| Předmět: |
Adult
Male numerosity Brain Mapping vision decoding fMRI Mathematical Concepts Magnetic Resonance Imaging working memory Young Adult Memory Short-Term short‐term memory Pattern Recognition Visual Parietal Lobe MVPA Humans Female 100 Philosophie und Psychologie::150 Psychologie::150 Psychologie Research Articles Research Article |
| Zdroj: | Human Brain Mapping |
| DOI: | 10.17169/refubium-30279 |
| Popis: | Both animal and human studies on numerosity have shown the importance of the parietal cortex for numerosity processing. However, most studies have focused on the perceptual processing of numerosity. Still, it is unclear how and where numerosity information is coded when this information is retained during a working memory delay phase. Such temporal storage could be realized by the same structures as perceptual processes, or be transformed to a more abstract representation, potentially involving prefrontal regions. FMRI decoding studies allow the identification of brain areas that exhibit multi‐voxel activation patterns specific to the content of working memory. Here, we used an assumption‐free searchlight‐decoding approach to test where numerosity‐specific codes can be found during a 12 s retention period. Participants (n = 24) performed a retro‐cue delayed match‐to‐sample task, in which numerosity information was presented as visual dot arrays. We found mnemonic numerosity‐specific activation in the right lateral portion of the intraparietal sulcus; an area well‐known for perceptual processing of numerosity. The applied retro‐cue design dissociated working memory delay activity from perceptual processes and showed that the intraparietal sulcus also maintained working memory representation independent of perception. During an fMRI experiment, participants performed a retro‐cue delayed match‐to‐sample task in which the numerosity of visually presented dot stimuli were maintained in working memory. We found mnemonic numerosity‐specific activation in the right lateral portion of the intraparietal sulcus, which suggests that the IPS retained working memory representation independent of perception. |
| Databáze: | OpenAIRE |
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