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Related Concept Videos

Working Memory01:24

Working Memory

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Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
136

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Disrupted working memory event-related network dynamics in multiple sclerosis.

Chiara Rossi1,2, Diego Vidaurre3,4, Lars Costers5,6

  • 1AIMS lab, Center for Neurosciences, Vrije Universiteit Brussel, Brussels, Belgium. chiara.rossi@vub.be.

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Summary
This summary is machine-generated.

Working memory impairment in multiple sclerosis (MS) is linked to altered brain network activity. This study used advanced imaging to identify specific network changes affecting attention and cognitive performance in MS patients.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Medical Imaging

Background:

  • Working memory (WM) impairment is a common early symptom in multiple sclerosis (MS), significantly impacting patient quality of life.
  • Understanding the neurophysiological basis of WM deficits in MS is crucial for developing effective interventions.

Purpose of the Study:

  • To investigate the neurophysiological underpinnings of working memory impairment in relapsing-remitting MS using functional neuroimaging.
  • To identify specific functional brain networks altered in MS patients during a working memory task.

Main Methods:

  • Utilized magnetoencephalography (MEG) data acquired during a visual-verbal n-back task.
  • Applied a data-driven technique, the time delay embedded-hidden Markov model (TDE-HMM), to extract spectrally defined functional networks.
  • Compared network activation patterns between MS patients and healthy controls (HC).

Main Results:

  • Decreased activation in an early theta prefrontal network associated with stimulus encoding and attentional control was observed in MS patients compared to HC.
  • This diminished activation correlated with reduced task accuracy and increased reaction times in MS patients.
  • A frontoparietal network, showing beta coupling and resembling the P300 event-related potential, exhibited amplified activation in MS patients treated with benzodiazepines.

Conclusions:

  • The TDE-HMM technique effectively extracts task-relevant functional networks that display disease-specific and treatment-related alterations in MS.
  • These findings suggest that altered network dynamics, particularly in attention-related networks, contribute to working memory deficits in MS.
  • The identified network alterations may serve as potential biomarkers for assessing and monitoring working memory impairment in MS.