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Related Concept Videos

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.
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Long-term Potentiation01:35

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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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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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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...

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The Power of Interstimulus Interval for the Assessment of Temporal Processing in Rodents
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Lengthened temporal integration in schizophrenia.

Brent D Parsons1, Shilpa Gandhi, Elyse L Aurbach

  • 1Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA.

Neuropsychologia
|November 28, 2012
PubMed
Summary
This summary is machine-generated.

Schizophrenia patients show altered temporal integration, with a longer perceptual window. This fundamental visual processing deficit may explain higher-level cognitive and experiential disturbances in schizophrenia.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • Schizophrenia research often focuses on higher cognitive deficits.
  • This study investigates fundamental perceptual processing, specifically temporal integration.

Purpose of the Study:

  • To examine temporal integration and repetition suppression in schizophrenia.
  • To determine if visual processing abnormalities underlie schizophrenia symptoms.

Main Methods:

  • Flicker fusion thresholds were measured in schizophrenia patients and healthy controls.
  • Numerosity judgments were assessed using repeated and novel visual stimuli.
  • Generalizability across stimulus types (letters, pictures, faces, words) was tested.

Main Results:

  • Schizophrenia patients had significantly lower flicker fusion thresholds, indicating longer temporal integration.
  • Patients reported higher numerosity, confirming a lengthened integration window.
  • The largest differences were observed with repeated stimuli, suggesting diminished repetition suppression.

Conclusions:

  • Schizophrenia involves a lengthened visual integration window and potentially deficient repetition suppression.
  • These perceptual timing abnormalities may contribute to higher-level deficits and subjective experiences in schizophrenia.