Neuronal Activity During Different Behaviors in Aplysia: A Distributed Organization?

The active neuronal populations in the Aplysia abdominal ganglion during spontaneous and evoked behaviors were compared with the use of multineuronal optical measurements. In some preparations, more than 90 percent of the neurons activated during the reflex withdrawal of the gill also were activated...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1994-02, Vol.263 (5148), p.820-823
Main Authors: Wu, Jian-Young, Cohen, Lawrence B., Falk, Chun Xiao
Format: Article
Language:English
Subjects:
Abdominal ganglia
Action Potentials
Animals
Aplysia - physiology
Biochemistry. Physiology. Immunology
Biological and medical sciences
Dyes
Fundamental and applied biological sciences. Psychology
Ganglia, Invertebrate - cytology
Ganglia, Invertebrate - physiology
Gills - physiology
Histograms
Invertebrates
Mollusca
Motor neurons
Neurons
Neurons - physiology
Neuroscience
Physiology. Development
Pumping
Reflex - physiology
Respiratory reflexes
Sense of touch
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Summary:The active neuronal populations in the Aplysia abdominal ganglion during spontaneous and evoked behaviors were compared with the use of multineuronal optical measurements. In some preparations, more than 90 percent of the neurons activated during the reflex withdrawal of the gill also were activated during respiratory pumping and during small spontaneous gill contractions. Although the same neurons made action potentials in all three behaviors, the activity patterns were different. There was a substantial interaction between the neural substrates underlying evoked and spontaneous behaviors when they were made to occur together. If a gill withdrawal reflex was elicited a few seconds after a respiratory pumping episode, the evoked neuronal activity in most neurons was clearly altered. These results suggest that a distributed organization involving a large number of neurons may be responsible for generating the two behaviors. Different behaviors appear to be generated by altered activities of a single, large distributed network rather than by small dedicated circuits.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.8303300