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Changes in frequency of spontaneous oscillations in procerebrum correlate to behavioural choice in terrestrial snails.

Samarova E, Balaban P - Front Cell Neurosci (2009)

Bottom Line: In vivo recordings in freely behaving naïve snails showed a significant decrease of spontaneous PC oscillations frequency during a stage of tentacle withdrawal to odor presentation.No significant difference in responses to 5% and 20% cineole was noted.Obtained results suggest that frequency of the PC lobe spontaneous oscillations correlate to the choice of behavior in snails: withdrawal (decrease in frequency) or approach (increase in frequency) to the source of odor.

View Article: PubMed Central - PubMed

Affiliation: Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Science Moscow, Russia.

ABSTRACT
The aim of our study was to understand functional significance of spontaneous oscillations of local field potential in the olfactory brain lobe of terrestrial snail, the procerebrum (PC). We compared changes in frequency of oscillations in semi-intact preparations from snails trained to percept the same conditioned odor as positive (associated with food reinforcement) or negative (associated with noxious reinforcement). In vivo recordings in freely behaving naïve snails showed a significant decrease of spontaneous PC oscillations frequency during a stage of tentacle withdrawal to odor presentation. In in vitro preparations from naïve snails, a similar decrease in frequency of the PC oscillations to odor presentation was observed. Changes in frequency of the oscillations to cineole presentations in the "aversive" group of snails (demonstrating withdrawal) were much more pronounced than in naïve snails. No significant difference in responses to 5% and 20% cineole was noted. Changes in the spontaneous oscillations frequency in the snails trained to respond with positive reaction (approach) to cineole depended on the concentration of the applied odor, and these responses were qualitatively similar to responses of other groups during the first 10 s of responses to odor, but significantly different (increase in PC oscillations frequency) from the responses of the aversively trained and naïve snails in the interval 11-30 s, which corresponds to the end of the tentacle withdrawal and timing of decision making (approach or escape) in the free behaving snails. Obtained results suggest that frequency of the PC lobe spontaneous oscillations correlate to the choice of behavior in snails: withdrawal (decrease in frequency) or approach (increase in frequency) to the source of odor.

No MeSH data available.


Related in: MedlinePlus

Averaged changes of the oscillatory rhythm recorded in vitro in the procerebrum of snails trained to respond with feeding reaction to odor application. (A) Changes in amplitude of the procerebral oscillations in response to cineole application in 5% (n = 6) and (B) 20% (n = 5) concentrations. (C) Changes in frequency of the procerebral oscillations in response to cineole application in 5% (n = 6) and (D) 20% (n = 5) concentrations. Vertical bars indicate the standard error of the mean. * p < 0.05, ** p < 0.01, *** p < 0.001. (E,F) The response of the procerebrum, MtC3, MtC1 neurons and the cerebro-buccal connective to cineole 5% (E) and 20% (F) application to the nose–brain preparation of the snail trained to respond with the feeding reaction to the cineole.
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Figure 6: Averaged changes of the oscillatory rhythm recorded in vitro in the procerebrum of snails trained to respond with feeding reaction to odor application. (A) Changes in amplitude of the procerebral oscillations in response to cineole application in 5% (n = 6) and (B) 20% (n = 5) concentrations. (C) Changes in frequency of the procerebral oscillations in response to cineole application in 5% (n = 6) and (D) 20% (n = 5) concentrations. Vertical bars indicate the standard error of the mean. * p < 0.05, ** p < 0.01, *** p < 0.001. (E,F) The response of the procerebrum, MtC3, MtC1 neurons and the cerebro-buccal connective to cineole 5% (E) and 20% (F) application to the nose–brain preparation of the snail trained to respond with the feeding reaction to the cineole.

Mentions: The procerebral oscillations in preparations from snails trained to respond with positive (approach) reaction to the cineole odor demonstrated a significant decrease in the amplitude of the oscillations to the odor of low concentration (5%) during the first 10 s after cineole presentation (Figure 6A). The amplitude of the procerebral oscillations returned to normal 10 s after odor presentation to the semi-intact preparation.


Changes in frequency of spontaneous oscillations in procerebrum correlate to behavioural choice in terrestrial snails.

Samarova E, Balaban P - Front Cell Neurosci (2009)

Averaged changes of the oscillatory rhythm recorded in vitro in the procerebrum of snails trained to respond with feeding reaction to odor application. (A) Changes in amplitude of the procerebral oscillations in response to cineole application in 5% (n = 6) and (B) 20% (n = 5) concentrations. (C) Changes in frequency of the procerebral oscillations in response to cineole application in 5% (n = 6) and (D) 20% (n = 5) concentrations. Vertical bars indicate the standard error of the mean. * p < 0.05, ** p < 0.01, *** p < 0.001. (E,F) The response of the procerebrum, MtC3, MtC1 neurons and the cerebro-buccal connective to cineole 5% (E) and 20% (F) application to the nose–brain preparation of the snail trained to respond with the feeding reaction to the cineole.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2742667&req=5

Figure 6: Averaged changes of the oscillatory rhythm recorded in vitro in the procerebrum of snails trained to respond with feeding reaction to odor application. (A) Changes in amplitude of the procerebral oscillations in response to cineole application in 5% (n = 6) and (B) 20% (n = 5) concentrations. (C) Changes in frequency of the procerebral oscillations in response to cineole application in 5% (n = 6) and (D) 20% (n = 5) concentrations. Vertical bars indicate the standard error of the mean. * p < 0.05, ** p < 0.01, *** p < 0.001. (E,F) The response of the procerebrum, MtC3, MtC1 neurons and the cerebro-buccal connective to cineole 5% (E) and 20% (F) application to the nose–brain preparation of the snail trained to respond with the feeding reaction to the cineole.
Mentions: The procerebral oscillations in preparations from snails trained to respond with positive (approach) reaction to the cineole odor demonstrated a significant decrease in the amplitude of the oscillations to the odor of low concentration (5%) during the first 10 s after cineole presentation (Figure 6A). The amplitude of the procerebral oscillations returned to normal 10 s after odor presentation to the semi-intact preparation.

Bottom Line: In vivo recordings in freely behaving naïve snails showed a significant decrease of spontaneous PC oscillations frequency during a stage of tentacle withdrawal to odor presentation.No significant difference in responses to 5% and 20% cineole was noted.Obtained results suggest that frequency of the PC lobe spontaneous oscillations correlate to the choice of behavior in snails: withdrawal (decrease in frequency) or approach (increase in frequency) to the source of odor.

View Article: PubMed Central - PubMed

Affiliation: Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Science Moscow, Russia.

ABSTRACT
The aim of our study was to understand functional significance of spontaneous oscillations of local field potential in the olfactory brain lobe of terrestrial snail, the procerebrum (PC). We compared changes in frequency of oscillations in semi-intact preparations from snails trained to percept the same conditioned odor as positive (associated with food reinforcement) or negative (associated with noxious reinforcement). In vivo recordings in freely behaving naïve snails showed a significant decrease of spontaneous PC oscillations frequency during a stage of tentacle withdrawal to odor presentation. In in vitro preparations from naïve snails, a similar decrease in frequency of the PC oscillations to odor presentation was observed. Changes in frequency of the oscillations to cineole presentations in the "aversive" group of snails (demonstrating withdrawal) were much more pronounced than in naïve snails. No significant difference in responses to 5% and 20% cineole was noted. Changes in the spontaneous oscillations frequency in the snails trained to respond with positive reaction (approach) to cineole depended on the concentration of the applied odor, and these responses were qualitatively similar to responses of other groups during the first 10 s of responses to odor, but significantly different (increase in PC oscillations frequency) from the responses of the aversively trained and naïve snails in the interval 11-30 s, which corresponds to the end of the tentacle withdrawal and timing of decision making (approach or escape) in the free behaving snails. Obtained results suggest that frequency of the PC lobe spontaneous oscillations correlate to the choice of behavior in snails: withdrawal (decrease in frequency) or approach (increase in frequency) to the source of odor.

No MeSH data available.


Related in: MedlinePlus