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Related Concept Videos

Long-term Potentiation01:35

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Long-term Potentiation01:25

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when presynaptic neurons...
Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
Neural Circuits01:25

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Graded Potential01:19

Graded Potential

Graded potentials are localized fluctuations in the cell membrane's electrical charge, commonly found in the dendrites of neurons. The magnitude of these potential changes depends on the strength of the initiating stimulus. In a membrane at its resting potential, a graded potential signifies a voltage shift either above -70 mV or below -70 mV.
Graded potentials fall into two categories: depolarizing and hyperpolarizing. Depolarizing graded potentials typically occur when sodium (Na+) or calcium...
Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...

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A Procedure for Implanting Organized Arrays of Microwires for Single-unit Recordings in Awake, Behaving Animals
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Neural generators of sustained activity differ for stimulus-encoding and delay maintenance.

Ulrike Malecki1, Sabine Stallforth, Dorothee Heipertz

  • 1Institute of Cognitive Neurology and Dementia Research, Otto-von-Guericke University, Magdeburg, Germany.

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Working memory sustains information via neural activity. This study reveals distinct neural generators for encoding and maintenance, with reward expanding brain regions involved in memory.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Psychology

Background:

  • Working memory is crucial for goal-directed behavior by maintaining information beyond sensory input.
  • Sustained neural activity is a proposed mechanism for stimulus maintenance in working memory.
  • The precise neural generators of sustained activity during encoding versus maintenance remain unclear.

Purpose of the Study:

  • To investigate if neural generators of sustained activity differ between stimulus encoding and delay maintenance.
  • To examine the influence of monetary reward incentives on sustained delay activity and distractor suppression.
  • To understand how reward modulates the neural mechanisms of working memory.

Main Methods:

  • Utilized event-related potentials (ERPs) in humans during a delayed match-to-sample task.
  • Analyzed slow shifts in neural activity over parieto-occipital electrode sites.
  • Manipulated monetary reward incentives to assess their effects on cognitive performance and neural activity.

Main Results:

  • Distinct topographies and polarities of sustained neural activity were observed during encoding and delay maintenance of visual stimuli.
  • Neural generators changed in a time-locked manner to the onset of the delay period.
  • Reward incentives enhanced memory performance, correlating with an expansion of parieto-occipital regions involved in sustained delay activity, not improved distractor suppression.

Conclusions:

  • Neural generators for stimulus encoding and sustained delay maintenance in working memory are distinct.
  • Monetary rewards enhance working memory performance by increasing the extent of parieto-occipital neural engagement.
  • These findings provide insights into the dynamic neural mechanisms underlying working memory and the modulatory effects of reward.