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Related Concept Videos

Working Memory01:24

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.
Role of Cerebellum and Prefrontal Cortex in Memory01:14

Role of Cerebellum and Prefrontal Cortex in Memory

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 cerebellum's...

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Re-evaluating dorsolateral prefrontal cortex activation during working memory in schizophrenia.

Katherine H Karlsgodt1, Jacqueline Sanz, Theo G M van Erp

  • 1Department of Psychology, UCLA, 1285 Franz Hall, Box 951563, Los Angeles, CA 90095-1563, USA.

Schizophrenia Research
|February 7, 2009
PubMed
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Schizophrenia patients exhibit unique working memory (WM) brain activation patterns. High-performing patients show increased dorsolateral prefrontal cortex (DLPFC) activity, while low performers show decreased activity compared to controls.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • Working memory (WM) neuroimaging in schizophrenia shows inconsistent findings regarding prefrontal cortex (PFC) activation (hypo- vs. hyper-frontality).
  • These discrepancies may stem from variations in task difficulty and individual performance levels.

Purpose of the Study:

  • To propose and test a novel model of the performance-activation relationship in schizophrenia.
  • To integrate within-subject changes in activation with load alongside between-subject performance differences.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used in 14 recent-onset schizophrenia patients and 18 controls.
  • A parametric verbal working memory task was administered to assess activation patterns under varying cognitive loads.
  • The study analyzed the relationship between task performance, dorsolateral prefrontal cortex (DLPFC) activation, and working memory load.

Main Results:

  • A "cross-over" pattern was observed: control DLPFC activation increased as performance decreased, while schizophrenia patients showed the opposite.
  • Low-performing patients were hypoactive, and high-performing patients were hyperactive relative to controls.
  • Both groups demonstrated similar activation-by-load functions, with activation rising with difficulty then plateauing or decreasing at higher loads.

Conclusions:

  • A new framework predicts functional activation based on WM performance by combining within-subject load effects and between-subject performance differences.
  • Schizophrenia patients display overall hyper- or hypofrontality depending on behavioral performance, potentially linked to cellular changes and functional disability.
  • Higher-performing patients showed greater DLPFC activation than controls, while lower-performing patients activated the least, even at their own WM capacity.