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Working Memory

Working Memory

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 information.

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Disruption of Frontal Lobe Neural Synchrony During Cognitive Control by Alcohol Intoxication

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Task-related fronto-striatal functional connectivity during working memory performance in schizophrenia.

Yann Quidé¹, Richard W Morris, Alana M Shepherd

¹Schizophrenia Research Institute, Darlinghurst, NSW, Australia; School of Psychiatry, University of New South Wales, Randwick, NSW, Australia.

Schizophrenia Research

|September 11, 2013

Summary

Schizophrenia patients show disrupted brain connectivity during working memory tasks, particularly in fronto-striatal networks. This dysfunction in cortico-striatal pathways may impair information retrieval in individuals with schizophrenia.

Keywords:

Functional connectivity Performance Schizophrenia Striatum Working memory fMRI

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Area of Science:

Neuroscience
Psychiatry
Cognitive Science

Background:

Working memory (WM) deficits are a key feature of schizophrenia, linked to brain dysfunction.
Previous studies show inconsistent prefrontal and striatal activation and connectivity patterns in schizophrenia during WM tasks.

Purpose of the Study:

To investigate task-related functional connectivity (FC) between prefrontal and striatal regions during a WM task in schizophrenia patients.
To compare cortico-striatal FC patterns during a 2-back WM task between schizophrenia (SZ) and healthy control (HC) groups.

Main Methods:

Used a seed-based method to analyze functional connectivity (FC) during a 2-back WM task.
Compared blood oxygenation level dependent (BOLD) responses and FC between 28 SZ and 28 HC individuals.
Examined connectivity within the dorsolateral prefrontal cortex (DLPFC), ventrolateral prefrontal cortex (VLPFC), inferior parietal lobule (IPL), and striatum.

Main Results:

Schizophrenia patients exhibited greater bilateral striatal activity but similar cortical activity compared to controls.
Healthy controls showed positive performance-related FC between right DLPFC-caudate and right VLPFC-IPL, absent in SZ.
SZ patients displayed negative performance-related FC between left putamen and right VLPFC; HC showed greater VLPFC-putamen and VLPFC-IPL FC.

Conclusions:

Schizophrenia is associated with critical dysfunction in cortico-striatal connectivity during WM performance.
Impaired fronto-striatal network connectivity may underlie working memory deficits in schizophrenia.
Findings highlight the role of disrupted functional connectivity in schizophrenia pathophysiology.