What question did this study set out to answer?

To determine whether amygdala-stimulated defense reactions alter brain and adrenal catecholamine concentrations.

July 23, 1965Science

Brain Catecholamines: Relation to the Defense Reaction Evoked by Amygdaloid Stimulation in Cat

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To determine whether amygdala-stimulated defense reactions alter brain and adrenal catecholamine concentrations.
Delivered electrical stimulation to the amygdala in feline models to elicit either active defense reactions or quieting and sleep states.
Measured concentrations of noradrenalin and dopamine in brain tissue and catecholamine levels in the adrenal glands following stimulation.
Electrical stimulation producing a defense reaction led to a marked reduction in noradrenalin concentrations within the brain and adrenal glands, with brain dopamine remaining unaffected.
Stimulation leading to calming or sleep produced no detectable changes in catecholamine concentrations, indicating that noradrenalin depletion is specific to defense response production.

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Implication

Experimental animal study reveals amygdaloid stimulation evoking defense reactions reduces brain noradrenalin in cats, suggesting specific catecholamine involvement in fear responses.

Cite This Study

Reis et al. (1965) studied this question.

synapsesocial.com/papers/6a0f84864fb650da4ffe37af https://doi.org/10.1126/science.149.3682.450

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Implication

Experimental animal study reveals amygdaloid stimulation evoking defense reactions reduces brain noradrenalin in cats, suggesting specific catecholamine involvement in fear responses.

Brain Catecholamines: Relation to the Defense Reaction Evoked by Amygdaloid Stimulation in Cat

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Discussion

Implication

Cite This Study

Brain Catecholamines: Relation to the Defense Reaction Evoked by Amygdaloid Stimulation in Cat

Key Points

Discussion

Implication

Cite This Study

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