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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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Related Experiment Video

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The Power of Interstimulus Interval for the Assessment of Temporal Processing in Rodents
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The Power of Interstimulus Interval for the Assessment of Temporal Processing in Rodents

Published on: April 19, 2019

Local contextual processing effects with increasing stimulus presentation rate.

Noa Fogelson1, Miguel Fernandez-del-Olmo

  • 1Department of Psychology, University of A Coruña, Campus de Elviña, La Coruña, 15071, Spain. nfogelson@udc.es

Brain Topography
|August 19, 2010
PubMed
Summary
This summary is machine-generated.

Faster stimulus presentation rates enhance the brain's use of predictive local context, improving target detection and decision confidence. This effect was observed using electroencephalography (EEG) in a visual oddball task.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Psychology

Background:

  • Local context processing involves using preceding stimuli to predict upcoming events.
  • Stimulus presentation rate can influence cognitive processing and neural responses.

Purpose of the Study:

  • To investigate how varying stimulus presentation rates affect local contextual processing.
  • To examine the impact of faster vs. slower stimulus rates on neural correlates of prediction.

Main Methods:

  • Electroencephalography (EEG) recorded from 12 subjects during two sessions with different stimulus presentation rates (150 ms vs. 50 ms).
  • Participants responded to target stimuli embedded in sequences of standard stimuli, some predictive of targets.
  • Analysis focused on reaction times and P3b latency shifts between predicted and random targets.

Main Results:

  • Reaction times were faster for predicted targets than random targets in both sessions.
  • Faster stimulus presentation rates led to a greater P3b latency shift between predicted and random targets.
  • P3b latency for predicted targets was shorter in the faster session compared to the slower session.

Conclusions:

  • Increased stimulus presentation rates enhance the utilization of predictive local context.
  • Greater reliance on predictive context at faster rates increases decision confidence in target detection.
  • Findings highlight the dynamic interplay between processing speed and predictive coding in the brain.