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Related Concept Videos

Functional Brain Systems: Limbic System01:15

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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...
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Role of Amygdala in Memory01:16

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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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The physiology of emotions is a multifaceted process involving the autonomic nervous system, brain structures, hormones, and neurotransmitters. This intricate interplay dictates how emotions manifest in the body and influence behavior.
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Stanley Schachter and Jerome Singer proposed the two-factor theory of emotion, which emphasizes the interplay between physiological arousal and cognitive labeling in forming emotional experiences. This theory suggests that emotions are not simply a result of physiological responses but rather a combination of these responses and the individual's cognitive interpretation of them.
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Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
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Related Experiment Video

Updated: Nov 1, 2025

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices
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A human colliculus-pulvinar-amygdala pathway encodes negative emotion.

Philip A Kragel1, Marta Čeko2, Jordan Theriault3

  • 1Institute of Cognitive Science, University of Colorado Boulder, Boulder, CO 80309, USA; Department of Psychology, Emory University, Atlanta, GA 30322, USA; Department of Psychiatry and Behavioral Science, Emory University, Atlanta, GA 30322, USA.

Neuron
|June 24, 2021
PubMed
Summary

A newly identified human brain pathway, the superior colliculus-pulvinar-amygdala, rapidly processes threats. This "low road" pathway is crucial for negative emotional responses to external stimuli.

Keywords:
amygdalafMRIfunctional connectivitymultivariate pathway identificationnegative emotionpulvinarsuperior colliculus

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Brain Imaging Investigation of the Neural Correlates of Emotion Regulation
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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Affective Neuroscience

Background:

  • Threat detection is vital for survival, relying on rapid sensory processing.
  • Rodents utilize a subcortical

Purpose of the Study:

  • To characterize the human equivalent of the rodent subcortical threat detection pathway.
  • To develop and validate a novel framework for identifying functional neural pathways.

Main Methods:

  • Developed a novel pathway identification framework using pattern recognition for inter-region connectivity.
  • Validated the framework using functional magnetic resonance imaging (fMRI) on known thalamocortical pathways.
  • Applied the framework to identify a human superior colliculus-pulvinar-amygdala pathway.

Main Results:

  • The framework demonstrated high sensitivity and specificity in identifying known pathways.
  • A functional human superior colliculus-pulvinar-amygdala pathway was identified.
  • Activity in this pathway correlated with emotional responses to negative stimuli, but not pleasant stimuli or pain.

Conclusions:

  • A human