Amygdala Activation
Amygdala Activation - Related Videos
10:48
How to Detect Amygdala Activity with Magnetoencephalography using Source Imaging
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Cited by 27 •
2013
This article describes how to record amygdala activity with magnetoencephalography (MEG). In addition this article will describe how to conduct trace fear conditioning without awareness, a task that activates the amygdala. It will cover 3 topics: 1) Designing a trace conditioning paradigm using backward masking to manipulate awareness. 2) Recording brain activity during the task using magnetoencephalography. 3) Using source imaging to recover signal from subcortical structures.
08:41
Caspase-3 Activity in the Rat Amygdala Measured by Spectrofluorometry After Myocardial Infarction
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Cited by 20 •
2016
Myocardial infarction (MI) is not only followed by impaired cardiac function but also by apoptosis in the amygdala, a brain region involved in the behavioral consequences of MI. This protocol describes how to induce MI, collect amygdala tissue and measure caspase-3 activity, a marker of apoptosis, therein.
02:32
Generation of Tilted Amygdala Slices from a Mouse Brain
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2025
The video demonstrates the generation of tilted amygdala slices from a mouse brain. The brain is positioned at an angle on the vibratome specimen stage to obtain slices containing the amygdala and axons from the medial prefrontal cortex that form synaptic connections with the amygdala. The brain slices are maintained at the physiological temperature to preserve the tissue for further experiments.
04:18
Visualization and Mapping of Neuronal Pathways in an Amygdala Brain Slice
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2025
This video demonstrates a procedure for analyzing synaptic connectivity between medial prefrontal cortex (mPFC) and amygdala neurons using acute amygdala brain slices from mice. The mPFC neurons in these mice express channelrhodopsin fused to a fluorescent protein. The channelrhodopsins facilitate ion influx and action potential generation in the mPFC neurons upon light activation. Consequently, mPFC neurons release neurotransmitters that bind to postsynaptic amygdala neurons, triggering...
02:05
Generating a Coronal Brain Slice Exposing the Amygdala Regions from a Mouse Brain
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2025
This video demonstrates the preparation of thin coronal brain slices from a murine brain, exposing the amygdala regions rich in synaptic connections from the medial prefrontal cortex. The slices are then recovered in oxygenated artificial cerebrospinal fluid to maintain neuronal viability.
FAQs
Activation is organized as a circuit rather than a single uniform response. Sensory and contextual signals are integrated in the basolateral amygdala, where learned associations can influence their significance. Downstream central-amygdala signaling then recruits hypothalamic and brainstem pathways, linking interpretation of an event with coordinated autonomic, hormonal, and behavioral outputs.
The emotional significance of sensory information depends partly on associations acquired through experience and on surrounding contextual cues. This integration allows the amygdala to participate in fear conditioning and emotional memory, because responses can reflect more than the immediate stimulus. Studying these influences helps explain why similar events may produce different emotional or behavioral outcomes.
Signals from emotionally responsive amygdala circuits can affect how the brain prioritizes information and evaluates events. The overview identifies links between amygdala activation, attention, learning, and decision-making, indicating that emotional significance can shape cognitive processing rather than remain separate from it. These relationships are examined to understand how salient events alter behavior and memory.
Amygdala circuits help connect emotionally significant information with autonomic, hormonal, and behavioral responses coordinated through the hypothalamus and brainstem. When researchers examine these pathways, they can relate circuit activity to stress responses and anxiety-related behavior. This makes amygdala activation a useful neuroscience framework for investigating how emotional processing contributes to those conditions.
Researchers examine amygdala activation with neuroimaging, electrophysiology, and behavioral experiments. These approaches provide complementary information: neuroimaging tracks activity in the brain, electrophysiology examines neural signaling, and behavioral experiments connect circuit function with observable responses. Combining methods helps relate amygdala activity to fear conditioning, emotional memory, stress responses, attention, learning, or decision-making.
Behavioral experiments can show how emotional learning and memory relate to amygdala circuitry. In particular, fear-conditioning paradigms help investigators examine learned associations between sensory or contextual information and behavioral responses. Such experiments do not only measure activity; they also provide behavioral outcomes that can be interpreted alongside neuroimaging or electrophysiological findings.
Studying amygdala activation connects basic circuit mechanisms with broader questions about emotion and behavior. Research can address how the brain assigns significance to sensory and contextual information, how emotional memory forms, and how stress or anxiety-related responses emerge. These findings also clarify the influence of emotion on attention, learning, and decision-making.