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Respiratory pumping seizure: a newly discovered spontaneous stereotyped behavior pattern in the opisthobranch mollusc Aplysia californica

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Summary

  1. 1.

    Intact, freely-behaving Aplysia californica were monitored continuously for 24 h via time-lapse video and in vivo extracellular electrophysiological recording during 24 h exposure to both ambient normoxia (6.1—6.9 ppM dissolved O2) and hypoxia (1.2–2.7 ppM dissolved O2) followed by 1–2 h of aquarium reoxygenation.

  2. 2.

    In ambient normoxia, the stereotyped behavior known as respiratory pumping (RP) was found to spontaneously occur in several forms other than the solitary behavioral response previously described.

  3. 3.

    The most extreme variant of the new forms of RP was that of the RP seizure which was a series of RP responses (20–60) that occurred over a 30–90 min period and in a pattern characterized by a progressively greater inter-response interval. RP seizures occurred at frequencies ranging from 0–3 times per 24 h.

  4. 4.

    The time-course of RP seizure inter-response intervals was stereotyped across animals while seizure duration and the number of RP responses within a seizure were more similar for a given animal than across animals.

  5. 5.

    The other forms of RP included double and triple RP responses and abbreviated RP seizures. One instance of a double RP seizure was recorded.

  6. 6.

    Prolonged exposure to ambient hypoxia depressed all forms of RP.

  7. 7.

    Aquarium reoxygenation returned RP activity levels to near that prior to hypoxia exposure; seizure rate was above that occurring in ambient normoxia.

  8. 8.

    Potential physiological ramifications of RP seizures are discussed along with a possible mechanism to account for the repertoire of naturally-occurring RP behaviors.

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Abbreviations

RP :

Respiratory pumping

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Kanz, J.E., Quast, W.D. Respiratory pumping seizure: a newly discovered spontaneous stereotyped behavior pattern in the opisthobranch mollusc Aplysia californica . J Comp Physiol A 166, 619–627 (1990). https://doi.org/10.1007/BF00240011

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  • DOI: https://doi.org/10.1007/BF00240011

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