Unique Configurations of Compression and Truncation of Neuronal Activity Underlie l-DOPA-Induced Selection of Motor Patterns in
Autor: | Curtis L. Neveu, Ryota Homma, Shin Nagayama, John H. Byrne, Douglas A. Baxter, Renan M. Costa |
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Rok vydání: | 2017 |
Předmět: |
animal structures
Dopamine Agents Voltage-sensitive dye Action Potentials Biology Motor Activity Choice Behavior Functional Laterality Levodopa Dopamine Aplysia Neural Pathways medicine Reaction Time Premovement neuronal activity Animals Latency (engineering) Motor Neurons Dose-Response Relationship Drug General Neuroscience Central pattern generator General Medicine Feeding Behavior New Research biology.organism_classification Axons Voltage-Sensitive Dye Imaging Ganglia Invertebrate voltage-sensitive dye central pattern generator medicine.anatomical_structure 8.1 Sensory and Motor Systems Spike (software development) Neuron l-DOPA Neuroscience medicine.drug |
Zdroj: | eNeuro |
ISSN: | 2373-2822 |
Popis: | Visual Abstract A key issue in neuroscience is understanding the ways in which neuromodulators such as dopamine modify neuronal activity to mediate selection of distinct motor patterns. We addressed this issue by applying either low or high concentrations of l-DOPA (40 or 250 μM) and then monitoring activity of up to 130 neurons simultaneously in the feeding circuitry of Aplysia using a voltage-sensitive dye (RH-155). l-DOPA selected one of two distinct buccal motor patterns (BMPs): intermediate (low l-DOPA) or bite (high l-DOPA) patterns. The selection of intermediate BMPs was associated with shortening of the second phase of the BMP (retraction), whereas the selection of bite BMPs was associated with shortening of both phases of the BMP (protraction and retraction). Selection of intermediate BMPs was also associated with truncation of individual neuron spike activity (decreased burst duration but no change in spike frequency or burst latency) in neurons active during retraction. In contrast, selection of bite BMPs was associated with compression of spike activity (decreased burst latency and duration and increased spike frequency) in neurons projecting through specific nerves, as well as increased spike frequency of protraction neurons. Finally, large-scale voltage-sensitive dye recordings delineated the spatial distribution of neurons active during BMPs and the modification of that distribution by the two concentrations of l-DOPA. |
Databáze: | OpenAIRE |
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