Maturation of escape circuit function during the early adulthood of cockroaches Periplaneta americana

Frederic Libersat, Vicky Leung, Adi Mizrahi, Nick Mathenia, Christopher Comer

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

During postembryonic development of insects, sensorimotor pathways, which generate specific behaviors, undergo maturational changes. It is less clear whether such pathways are typically stable, or undergo further maturation, during the adult stage. In the present study, we have examined this issue by multilevel analysis of a simple model system, the escape behavior of the cockroach, from identified synapses to behavior. We show that the escape system is highly responsive immediately after the molt to adulthood, but that the latency of escape responses was not at its typical value immediately after the molt to adult. The latency of escape behavior increased over the first 30 days of adult life, perhaps indicating maturational adjustments of the escape sensorimotor pathway. The first station in the escape circuitry is the synaptic connections between the cereal wind receptors and the giant interneurons. We measured unitary excitatory synaptic potentials between single sensory neurons and an identified giant interneuron (GI2). We found a decrease in the synaptic strength between identified cereal hairs from a single column and GI2 over the first month after the adult molt. Consequently, the latency and the number of action potentials of GI2 in response to natural stimuli increased and decreased respectively during this time. Thus, we show that both behavioral performance and the wind sensitivity of GI2 decreased over the first month after molt. We conclude that the cockroach escape system undergoes further sensorimotor maturation over a period of 1 month, and that cellular changes correlate with, or predict, some changes in behavioral performance.

Original languageEnglish
Pages (from-to)62-71
Number of pages10
JournalJournal of Neurobiology
Volume62
Issue number1
DOIs
StatePublished - 1 Jan 2005

Keywords

  • Escape behavior
  • Giant interneurons
  • Insects
  • Postembryonic development

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