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Related Concept Videos

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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...
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Negative and Cognitive Symptoms of Schizophrenia01:30

Negative and Cognitive Symptoms of Schizophrenia

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Negative symptoms of schizophrenia indicate a reduction or absence of typical behaviors and emotional responses found in healthy individuals, while positive symptoms reflect an excess or distortion of normal functioning.
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Schizophrenia01:17

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Schizophrenia, a term introduced by Swiss psychiatrist Eugen Bleuler in 1911, describes a severe psychological disorder marked by profound disruptions in attention, thought processes, language, emotion, and interpersonal relationships. The core feature of schizophrenia is psychosis — a state characterized by a fundamental detachment from reality. This disconnection manifests through distorted logic, impaired perception, and atypical behavior, severely affecting the lives of those...
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A schema is a mental framework that helps individuals organize and interpret information. Schemata, formed from previous experiences, influence how we process new information: how we encode it, the inferences we make, and how we retrieve it. For instance, a schema for what a typical classroom looks like might include desks, a teacher's desk, a whiteboard, and students in such an environment. This expectation helps us quickly understand and navigate new classrooms without needing to analyze...
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Role of Cerebellum and Prefrontal Cortex in Memory01:14

Role of Cerebellum and Prefrontal Cortex in Memory

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The cerebellum, while traditionally associated with motor control, also plays a crucial role in memory, particularly in procedural memory, which involves learning motor tasks that become automatic through repetition. For example, studies have shown that when the cerebellum is damaged, individuals or animals lose the ability to learn conditioned motor responses, such as the conditioned eye-blink response in classical conditioning experiments with rabbits. This study demonstrates the...
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The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
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Network hub centrality and working memory performance in schizophrenia.

Hamdi Eryilmaz1, Melissa Pax2, Alexandra G O'Neill2

  • 1Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, USA. hamdi.eryilmaz@mgh.harvard.edu.

Schizophrenia (Heidelberg, Germany)
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Summary
This summary is machine-generated.

Schizophrenia patients show altered brain network hubs, impacting working memory. Network analysis reveals specific hub dysfunctions linked to cognitive performance, offering potential biomarker targets.

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Area of Science:

  • Neuroscience
  • Graph Theory
  • Psychiatry

Background:

  • Cognitive impairment, particularly working memory deficits, is a significant challenge in schizophrenia treatment.
  • Brain network hub dysfunction, potentially due to neurodevelopmental issues, is implicated in schizophrenia's cognitive symptoms.

Purpose of the Study:

  • To quantify brain network hub centrality using weighted degree in schizophrenia patients and healthy controls.
  • To identify critical brain network nodes associated with working memory performance in schizophrenia.

Main Methods:

  • Utilized graph theory's weighted degree metric to assess cortical hub centrality.
  • Compared network metrics between 29 schizophrenia patients and 29 healthy controls.
  • Employed cross-validated prediction analysis to assess the utility of network metrics for predicting working memory accuracy.

Main Results:

  • Elevated weighted degree in the default mode network (DMN) correlated with poorer working memory in both groups.
  • Higher weighted degree in right superior temporal cortex (ventral attention network - VAN) nodes was linked to better accuracy in patients.
  • Prefrontal and parietal hub connectivity predicted cognitive performance uniquely in schizophrenia patients, driven by inter-network connections.

Conclusions:

  • Schizophrenia is characterized by dysfunctional cortical hubs crucial for internal and external cognition.
  • Topological network analysis, specifically weighted degree, shows promise for identifying biomarkers of cognitive deficits in schizophrenia.