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Related Concept Videos

Higher Mental Functions of Brain: Learning and Memory01:26

Higher Mental Functions of Brain: Learning and Memory

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Memory is one of the most vital higher mental functions of the brain. Memory is closely related to learning because it enables us to retain information and experiences from our past to use them in our present life. It also helps us to remember facts, events, and skills, such as riding a bike or swimming. There are two types of memory — declarative memory, which involves memorizing facts or events, and procedural memory, which enables us to remember how to do something like writing or...
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Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory 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...
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Long-term memory is a relatively permanent type of memory, capable of storing vast amounts of information over extended periods. Its storage capacity is generally considered unlimited.
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Role of Hippocampus in Memory01:19

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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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Role of Cerebellum and Prefrontal Cortex in Memory01:14

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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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Assessing Working Memory in Children: The Comprehensive Assessment Battery for Children – Working Memory (CABC-WM)
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Banishing the homunculus: making working memory work.

T E Hazy1, M J Frank, R C O'Reilly

  • 1Department of Psychology, University of Colorado Boulder, 345 UCB, Boulder, CO 80309, USA.

Neuroscience
|December 14, 2005
PubMed
Summary
This summary is machine-generated.

This study presents the Prefrontal Cortex, Basal Ganglia Working Memory (PBWM) model, which explains how the prefrontal cortex and basal ganglia work together for executive functions and working memory. The model uses reinforcement learning to achieve human-like performance.

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Area of Science:

  • Cognitive Neuroscience
  • Computational Neuroscience
  • Neuroscience

Background:

  • The prefrontal cortex (PFC) is traditionally linked to working memory and executive functions.
  • The precise neural and computational mechanisms integrating these functions remain unclear, often conceptualized as a 'homunculus'.
  • Understanding this integration is crucial for deconstructing complex cognitive processes.

Purpose of the Study:

  • To elucidate the computational and neural mechanisms underlying working memory and executive function.
  • To present and detail the Prefrontal Cortex, Basal Ganglia Working Memory (PBWM) model.
  • To demonstrate how reinforcement learning can explain the development of these functions.

Main Methods:

  • Reviewing progress in laboratory research and computational modeling.
  • Outlining six key functional demands of working memory.
  • Describing the PBWM computational model, integrating PFC and basal ganglia (BG) systems.

Main Results:

  • The PBWM model demonstrates actively maintained PFC representations dynamically gated by the BG.
  • The model leverages reinforcement learning via the midbrain dopaminergic system for strategic control.
  • PBWM achieves human-like performance on challenging working memory tasks and is supported by empirical data.

Conclusions:

  • The PBWM model provides a mechanistic explanation for the integrated function of PFC and BG in working memory and executive control.
  • Reinforcement learning mechanisms are key to developing strategic, task-appropriate cognitive control.
  • The model offers a testable framework for future research in cognitive neuroscience.