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Unveiling Glutamate Dynamics: Cognitive Demands in Human Short-Term Memory Learning Across Frontal and Parietooccipital Cortex: A Functional Mrs Study Publisher



Mohammadi H1 ; Jamshidi S1 ; Khajehpour H2 ; Adibi I3, 4 ; Rahimiforoushani A5 ; Karimi S6 ; Serej ND1, 7 ; Alam NR6, 8, 9
Authors
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Authors Affiliations
  1. 1. Department of Bioimaging, School of Advanced Technologies in Medicine, Isfahan University of Medical Sciences (IUMS), Isfahan, Iran
  2. 2. Multimodal Functional Imaging Lab, Department of Physics and PERFORM Centre, Concordia University, Montreal, QC, Canada
  3. 3. Department of Neurology, School of Medicine, Isfahan University of Medical Sciences (IUMS), Isfahan, Iran
  4. 4. Isfahan Neurosciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
  5. 5. Department of Epidemiology & Biostatistics, School of Public Health, Tehran University of Medical Sciences (TUMS), Tehran, Iran
  6. 6. Department of Medical Physics & Biomedical Eng., School of Medicine, Tehran University of Medical Sciences (TUMS), Tehran, Iran
  7. 7. School of Computing and Engineering, University of West London, United Kingdom
  8. 8. Concordia University, PERFORM Center, School of Health, Montreal, QC, Canada
  9. 9. Magnetic Resonance Imaging Lab, National Brain Mapping Laboratory (NBML), Tehran, Iran

Source: Journal of Biomedical Physics and Engineering Published:2024


Abstract

Background: Acquiring new knowledge necessitates alterations at the synaptic level within the brain. Glutamate, a pivotal neurotransmitter, plays a critical role in these processes, particularly in learning and memory formation. Although previous research has explored glutamate’s involvement in cognitive functions, a comprehensive understanding of its real-time dynamics remains elusive during memory tasks. Objective: This study aimed to investigate glutamate modulation during memory tasks in the right Dorsolateral Prefrontal Cortex (DLPFC) and parieto-occipital regions using functional Magnetic Resonance Spectroscopy (fMRS). Material and Methods: This experimental research applied fMRS acquisition concurrently with a modified Sternberg’s verbal working memory task for fourteen healthy right-handed participants (5 females, mean age=30.64±4.49). The glutamate/ total-creatine (Glu/tCr) ratio was quantified by LCModel in the DLPFC and parietooccipital voxels while applying the tissue corrections. Results: The significantly higher Glu/tCr modulation was observed during the task with a trend of increased modulation with memory load in both the DLPFC (19.9% higher, P-value=0.018) and parieto-occipital (33% higher, P-value=0.046) regions compared to the rest. Conclusion: Our pioneering fMRS study has yielded groundbreaking insights into brain functions during S-term Memory (STM) and learning. This research provides valuable methodological advancements for investigating the metabolic functions of both healthy and disordered brains. Based on the findings, cognitive demands directly correlate with glutamate levels, highlighting the neurochemical underpinnings of cognitive processing. Additionally, the obtained results potentially challenge the traditional left-hemisphere-centric model of verbal working memory, leading to the deep vision of hemispheric contributions to cognitive functions. © Journal of Biomedical Physics and Engineering.
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