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Related Concept Videos

Preparedness and Phobias01:09

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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Classical conditioning, a fundamental principle of associative learning, explains various phenomena observed in daily life, such as fear development, the placebo effect, taste aversion, and drug habituation. These applications demonstrate the profound impact of associative learning on human behavior and physiological responses.
John B. Watson and Rosalie Rayner famously demonstrated the development of fear through classical conditioning in their experiment with Little Albert. They paired the...
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Associative learning, a core principle in behavioral psychology, involves forming connections between events and facilitating learned responses. This concept is vividly illustrated by classical conditioning, a process extensively studied by the Russian physiologist Ivan Pavlov. Pavlov's pioneering research on dogs' digestive systems led to the discovery that behaviors can be learned through association, laying the groundwork for classical conditioning.
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Conditioned taste aversion, also known as sauce béarnaise syndrome, is a phenomenon in which an individual develops an aversion to a certain food taste following a negative experience, typically illness. This form of aversion is a type of classical conditioning in which the taste of the food (conditioned stimulus, CS) is associated with the experience of illness (unconditioned stimulus, UCS).
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Behavior therapy incorporates diverse techniques rooted in classical conditioning principles to address maladaptive behaviors and anxiety disorders. These methods aim to reduce avoidance behaviors, foster adaptive coping mechanisms, and alter associations between stimuli and responses, making them effective in a wide range of therapeutic contexts.
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Related Experiment Video

Updated: May 29, 2026

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

SSRIs and conditioned fear.

Takeshi Inoue1, Yuji Kitaichi, Tsukasa Koyama

  • 1Department of Psychiatry, Hokkaido University Graduate School of Medicine, North 15, West 7, Kita-ku, Sapporo 060-8638, Japan. tinoue@med.hokudai.ac.jp

Progress in Neuro-Psychopharmacology & Biological Psychiatry
|September 20, 2011
PubMed
Summary
This summary is machine-generated.

Selective serotonin reuptake inhibitors (SSRIs) and 5-HT(1A) agonists reduce fear. Chronic SSRI treatment enhances these anxiolytic effects, suggesting increased serotonin transmission alleviates anxiety.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Psychiatry

Background:

  • Selective serotonin reuptake inhibitors (SSRIs) are primary treatments for anxiety disorders.
  • The exact mechanisms behind SSRI anxiolytic effects remain incompletely understood.
  • Serotonergic neurotransmission plays a key role in regulating fear and anxiety.

Purpose of the Study:

  • To review the literature on SSRI effects and serotonin (5-HT) neurochemical changes in conditioned fear.
  • To elucidate the neurobiological underpinnings of SSRI-mediated anxiolysis.
  • To explore the role of specific brain regions and receptors in fear reduction.

Main Methods:

  • Literature review focusing on SSRIs, 5-HT, and conditioned fear.
  • Analysis of studies involving acute and chronic SSRI administration.
  • Examination of microinjection studies targeting brain regions like the amygdala and hippocampus.

Main Results:

  • Acute SSRIs and 5-HT(1A) receptor agonists decreased the acquisition and expression of contextual conditioned fear.
  • Chronic SSRI administration amplified these anxiolytic-like effects.
  • The amygdala was identified as a key target for SSRIs and 5-HT(1A) agonists, while the hippocampus was a target for 5-HT(1A) agonists.

Conclusions:

  • Post-synaptic 5-HT receptors, particularly 5-HT(1A) receptors, are crucial for the anxiolytic effects of serotonergic drugs.
  • The findings support a revised 5-HT hypothesis of fear/anxiety, where enhanced 5-HT transmission ameliorates fear.
  • Behavioral data suggest that increased 5-HT transmission may decrease, rather than increase, fear responses.