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A rise-to-threshold process for a relative-value decision.

Vikram Vijayan1, Fei Wang2,3, Kaiyu Wang2,4

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This summary is machine-generated.

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Insect Physiology

Background:

  • Neural signals for rapid decisions are known, but less is understood about self-paced decisions over longer durations.
  • Drosophila melanogaster exhibit complex egg-laying site selection behaviors lasting minutes.
  • Specific neurons, oviDNs, are implicated in initiating the egg-deposition motor program.

Purpose of the Study:

  • To investigate the neural mechanisms underlying self-paced, relative-value decisions in Drosophila.
  • To characterize the activity of oviDNs during egg-laying site selection.
  • To identify the circuit elements regulating decision-making processes.

Main Methods:

  • Calcium imaging of oviDN activity in Drosophila brains.
  • Perturbational experiments to assess the necessity and sufficiency of oviDN activity.
  • Identification and functional analysis of a recurrent neural circuit feeding into oviDNs.

Main Results:

  • A specific calcium signal in oviDNs correlates with egg preparation, substrate value, and decision-making.
  • This signal exhibits a rise-to-threshold dynamic, influencing decision timing and outcome.
  • A recurrent circuit involving multiple cell types is essential for oviDN function and egg-laying.

Conclusions:

  • A rise-to-threshold process regulated by oviDNs underlies self-paced, relative-value decisions in flies.
  • Subthreshold variations in this neural process modulate decision time and choice.
  • The identified recurrent circuit provides insight into the neural basis of complex behavioral decisions.