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Preparedness and Phobias

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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The amygdala is a small, almond-shaped structure responsible for processing and storing memories, particularly those linked to emotions like fear and stress. It plays an essential role in the brain's response to emotionally significant events and often enhances memory formation by triggering stress hormone release. The amygdala is vital for encoding and retrieving memories associated with fear or stress, a process that is adaptive by helping organisms avoid dangerous situations.
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Related Experiment Video

Updated: Jun 2, 2026

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices
11:13

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

Published on: April 5, 2016

Placing prediction into the fear circuit.

Gavan P McNally1, Joshua P Johansen, Hugh T Blair

  • 1School of Psychology, The University of New South Wales, Sydney, NSW, Australia. g.mcnally@unsw.edu.au

Trends in Neurosciences
|May 10, 2011
PubMed
Summary

A newly identified neural circuit regulates fear learning by signaling unexpected aversive events. This brain pathway, involving the amygdala and midbrain, is crucial for fear conditioning and may be targeted in anxiety treatments.

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Last Updated: Jun 2, 2026

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices
11:13

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Published on: April 5, 2016

Trace Fear Conditioning in Mice
07:02

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Published on: March 20, 2014

Fear Incubation Using an Extended Fear-Conditioning Protocol for Rats
13:38

Fear Incubation Using an Extended Fear-Conditioning Protocol for Rats

Published on: August 22, 2020

Area of Science:

  • Neuroscience
  • Computational Psychiatry
  • Learning and Memory

Background:

  • Pavlovian fear conditioning relies on synaptic plasticity in the amygdala.
  • Understanding the neural basis of fear learning is critical for treating anxiety disorders.

Purpose of the Study:

  • To review evidence for a distributed neural circuit that regulates amygdala synaptic plasticity during fear learning.
  • To link this circuitry to prediction error signaling and its role in fear acquisition and modulation.

Main Methods:

  • Review of electrophysiological, molecular, and behavioral studies.
  • Integration of findings from functional neuroimaging and clinical research in humans.

Main Results:

  • A distributed neural circuit, including midbrain periaqueductal gray projections, modulates amygdala plasticity during fear learning.
  • This circuit signals aversive prediction errors, influencing the extent of fear acquisition.
  • Evidence suggests this circuit is active in humans during fear learning and relevant to anxiety treatments.

Conclusions:

  • The identified aversive prediction error circuit is a key regulator of fear learning.
  • This conserved mammalian mechanism offers potential therapeutic targets for clinical anxiety.