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Related Concept Videos

Long-Term Memory01:18

Long-Term Memory

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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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When an archer pulls the string in a bow, he saves the work done in the form of elastic potential energy. When he releases the string, the potential energy is released as kinetic energy of the arrow. A capacitor works on the same principle in which the work done is saved as electric potential energy. The potential energy (UC) could be calculated by measuring the work done (W) to charge the capacitor.
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An inductor is ingeniously crafted to accumulate energy within its magnetic field. This field is a direct result of the current that meanders through its coiled structure. When this current maintains a steady state, there is no detectable voltage across the inductor, prompting it to mimic the behavior of a short circuit when faced with direct current.
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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Briefly Flashed Scenes Can Be Stored in Long-Term Memory.

Arnaud Delorme1,2,3,4, Marlène Poncet1,2, Michèle Fabre-Thorpe1,2

  • 1Centre de Recherche Cerveau et Cognition, Université Toulouse III - Paul Sabatier, Toulouse, France.

Frontiers in Neuroscience
|October 23, 2018
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Summary
This summary is machine-generated.

Repeated exposure to briefly flashed images enhances long-term memory. Even with 20-millisecond presentations, trained participants showed significantly better recognition and distinct brain activity (event-related potentials) compared to untrained individuals.

Keywords:
animal imagescategorizationgo/no-go tasklong-term memoryvisual perception

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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Visual Perception

Background:

  • Human memory capacity for visual objects is extensive, with high recognition rates after brief, single exposures.
  • Previous studies demonstrated robust memory for images viewed for seconds.
  • The impact of extremely brief, repeated exposures on incidental memory storage was less understood.

Purpose of the Study:

  • To investigate the effect of repeated, extremely brief (20 ms) visual exposures on incidental long-term memory for natural scenes.
  • To compare recognition performance between untrained and trained participants.
  • To examine neural correlates of memory formation using electroencephalography (EEG).

Main Methods:

  • Participants viewed 400 natural scenes, either once (untrained) or 22 times over days (trained) in an unrelated task.
  • A go/no-go paradigm was used, where participants signaled recognition of previously seen images.
  • Electroencephalography (EEG) recorded brain activity, focusing on event-related potentials (ERPs).

Main Results:

  • Untrained participants recognized 64% of images seen briefly, significantly lower than expected from prior research.
  • Trained participants achieved 89% recognition accuracy for the same briefly presented images.
  • EEG data revealed significant event-related potential differences between familiar and novel images starting at 230 ms for the trained group only.

Conclusions:

  • Incidental storage of briefly flashed scenes into long-term memory is possible with sufficient repetition.
  • Repeated, extremely brief exposures can significantly enhance visual memory recognition.
  • Neural evidence supports enhanced memory processing in trained individuals, even for stimuli presented for only 20 ms.