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Human fear responses to certain stimuli, such as darkness, heights, deep water, and blood, can often arise despite the absence of direct negative experiences. This phenomenon is rooted in evolutionary psychology, which posits that humans have developed a predisposition to fear stimuli that historically posed significant survival threats. This predisposition, known as preparedness, suggests that early humans who developed a fear of potentially dangerous entities, such as venomous snakes and...
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Related Experiment Video

Updated: Aug 19, 2025

Author Spotlight: Exploring Neural Correlates of Defensive Behaviors in Fear Learning and Extinction
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Fear conditioning in invertebrates.

Amy K Pribadi1,2, Sreekanth H Chalasani1,2

  • 1Biological Sciences Graduate Program, University of California, San Diego, La Jolla, San Diego, CA, United States.

Frontiers in Behavioral Neuroscience
|November 28, 2022
PubMed
Summary

Invertebrate studies reveal conserved learning and memory mechanisms. Common pathways in fear-associated behaviors involve neurotransmitters and gene expression for short- and long-term changes.

Keywords:
A. californicaC. elegansD. melanogasterfear conditioninginvertebrateslearningmemorypredator-prey

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Area of Science:

  • Neuroscience
  • Behavioral Biology
  • Invertebrate Learning

Background:

  • Threat identification and prediction are crucial for animal survival.
  • Basic learning and memory mechanisms are conserved across species, including invertebrates.
  • Invertebrate models like Aplysia, Drosophila, and C. elegans offer insights into conserved neural pathways.

Purpose of the Study:

  • To summarize studies on learning and memory in invertebrates.
  • To highlight common pathways and mechanisms in invertebrate fear-associated behavioral changes.
  • To explore the potential of predator-prey interactions for studying learned fear.

Main Methods:

  • Review of fear conditioning studies using electric shock in Aplysia and Drosophila.
  • Analysis of neurotransmitter involvement (serotonin, dopamine) in aversive stimulus processing.
  • Examination of intracellular calcium dynamics and presynaptic neurotransmitter release.
  • Investigation of gene expression changes related to long-term behavioral modifications.
  • Summary of predator-induced behaviors in Aplysia, Drosophila, and C. elegans.

Main Results:

  • Fear conditioning in Aplysia and Drosophila involves serotonin or dopamine in relaying aversive stimuli.
  • Short-term behavioral changes are linked to altered intracellular calcium levels and increased neurotransmitter release.
  • Long-term behavioral changes require spaced trials and involve alterations in gene expression.
  • C. elegans exhibits aversive learning, though explicit fear conditioning requires further investigation due to stimulus limitations.

Conclusions:

  • Fundamental mechanisms of learning, memory, and fear conditioning are conserved in invertebrates.
  • Neurotransmitters like serotonin and dopamine play key roles in processing aversive stimuli.
  • Predator-prey interactions present a promising avenue for future research into learned fear in naturalistic contexts.