A team of neuroscientists from the Tulane University School of Science and Engineering and Tufts University School of Medicine studied how any memory of fear is formed in the brain’s amygdala. The study is published in the journal Nature Communications.
For several weeks, to understand the formation of memories of fear in the brain, the researchers anesthetized mice and performed surgeries on them. They also monitored the mice’s brain activity throughout the experiment.
The results showed that noradrenaline or norepinephrine (a stress neurotransmitter) facilitates fear processing in the brain. It stimulates certain neurons in the amygdala and generates a repetitive bustling pattern of electrical discharges. This pattern of electrical activity changes the frequency of brain wave oscillation in the amygdala, ‘arousing’ it into forming fear memories.
The researchers also contend that such a similar rush of fear memories are formed and sustained by the brain in people suffering from stress disorders and excessive trauma. One of the lead researchers, Dr. Jeffrey Tasker, elaborated: “This is the same process, we think, that goes awry in PTSD and makes it so you cannot forget traumatic experiences.”
To Know More Please Refer To
Fu, X., Teboul, E., Weiss, G.L. et al. Gq neuromodulation of BLA parvalbumin interneurons induces burst firing and mediates fear-associated network and behavioral state transition in mice. Nat Commun 13, 1290 (2022). https://doi.org/10.1038/s41467-022-28928-y