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Synaptic plasticity in the mormyrid electrosensory lobe.
C C Bell1, V Z Han, Y Sugawara
1Neurological Sciences Institute, Oregon Health Sciences University, Portland, OR 97209, USA. bellc@ohsu.edu
The Journal of Experimental Biology
|April 22, 1999
Summary
Fish sensory processing involves creating "negative images" to filter predictable input. This study shows associative synaptic depression in the electrosensory lateral line lobe (ELL) underlies this adaptive filtering mechanism.
Area of Science:
- Neuroscience
- Sensory Processing
- Fish Biology
Background:
- The mormyrid electrosensory lateral line lobe (ELL) acts as an adaptive sensory processor in fish.
- It generates negative images of predictable sensory input to minimize their impact.
- This involves associating central predictive signals with peripheral sensory inputs.
Purpose of the Study:
- To investigate the cellular mechanisms underlying adaptive sensory processing in the mormyrid ELL.
- To determine if synaptic plasticity contributes to the generation of negative sensory images.
Main Methods:
- In vitro electrophysiological studies in the mormyrid ELL.
- Pairing of parallel fiber input with postsynaptic Na+ spikes.
- Analysis of synaptic plasticity at parallel fiber synapses.
Main Results:
- Pairing input and spikes induced synaptic depression at parallel fiber synapses.
- This depression shares properties with the systems-level associative process.
- Properties include rapid establishment, anti-Hebbian nature, reversibility, input-specificity, and temporal restriction.
Conclusions:
- Associative synaptic depression at the parallel fiber synapse is a key cellular mechanism.
- This mechanism contributes to the adaptive generation of negative sensory images in the mormyrid ELL.
- The findings link cellular plasticity to systems-level sensory adaptation.