Related Experiment Video
Updated: Oct 11, 2025
07:02
Trace Fear Conditioning in Mice
Published on: March 20, 2014
33.2K
Dopamine and fear memory formation in the human amygdala
Andreas Frick1, Johannes Björkstrand2,3, Mark Lubberink4
1The Beijer Laboratory, Department of Neuroscience, Psychiatry, Uppsala University, Uppsala, Sweden. andreas.frick@neuro.uu.se.
Molecular Psychiatry
|December 4, 2021
Summary
Dopamine release in the human amygdala and striatum is crucial for fear learning. This dopamine release is linked to the strength of conditioned fear responses, supporting a conserved mechanism for aversive memory.
Area of Science:
- Neuroscience
- Psychology
- Neuroimaging
Background:
- Pavlovian fear conditioning is vital for survival, relying on amygdala-dependent neurocircuitry in both humans and rodents.
- Rodent studies suggest dopamine in the amygdala is critical for fear memory, but its role in humans remains unclear.
Purpose of the Study:
- To investigate the role of dopamine release in the human amygdala and striatum during fear learning.
- To determine if dopamine release correlates with the strength of conditioned fear responses and amygdala activity.
Main Methods:
- Simultaneous positron emission tomography (PET) and functional magnetic resonance imaging (fMRI) were used in human participants.
- Researchers measured dopamine release in the amygdala and striatum during a fear conditioning task.
Main Results:
- Dopamine release was observed in the amygdala and striatum during fear learning in humans.
- The extent of dopamine release was directly correlated with the strength of conditioned fear responses.
- Dopamine release was linearly coupled to learning-induced activity in the amygdala.
Conclusions:
- Endogenous dopamine release in the amygdala facilitates the formation of fear memories in humans, similar to rodents.
- This finding supports an evolutionarily conserved neurochemical mechanism for aversive memory formation across species.
Related Concept Videos
01:16Role of Amygdala in Memory
482
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.
One of the...
One of the...
482
01:15Functional Brain Systems: Limbic System
4.3K
The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
4.3K
01:23Role of Neurotransmitters in Memory
1.4K
Neurotransmitters are integral to the brain's communication system, enabling neurons to transmit signals across synapses. This chemical exchange underpins various cognitive functions, including memory processes. The role of neurotransmitters in memory is multifaceted, influencing the encoding, consolidation, and retrieval of memories through their action on different neural circuits.
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is...
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is...
1.4K
01:20Traumatic Memory
294
Emotionally traumatic events often lead to memories that are exceptionally vivid and enduring, sometimes persisting with remarkable clarity throughout an individual's life. A classic example of this phenomenon is a person who survives a car accident. Even years later, they may recall every detail of the event with startling accuracy — the screeching of the tires, the jarring impact, and the acrid smell of burning rubber. Such vividness contrasts sharply with how an individual...
294
01:09Preparedness and Phobias
169
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...
169