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The Brain’s Alarm System To Suppress Intrusive Thoughts and Inhibit Unwanted Memories

The Brain’s Alarm System To Suppress Intrusive Thoughts and Inhibit Unwanted Memories

brain's alarm

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Dr Adeel

Dr Adeel

Dr. M. Adeel is currently working as Distinguished Associate Professor at Beijing Normal University Zhuahi, China

The amygdala, which we call the brain’s alarm, is a tiny, almond shaped region in the limbic system. A brain region can proactively and reactively detect the need to inhibit unwanted memories.

Forget what you saw: a brain region detects when you are about to think of an unwanted memory and alerts other regions to suppress it, according to research published in JNeurosci today (April 18, 2022). JNeurosci is the Society for Neuroscience’s first journal. The brain’s alarm fires without us even having to think about it.

Crespo García et al. measured participants’ brain activity with both EEG and fMRI while they completed a memory task. The participants memorized sets of words (i.e., gate and train) and were asked to either recall a cue word’s pair (see gate, think about train) or only focus on the cue word (see gate, only think about gate).

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During proactive memory suppression, activity increased in the anterior cingulate cortex (ACC), a brain region involved in cognitive control, within the first 500 milliseconds of the task. The ACC relayed information to the dorsolateral prefrontal cortex (DLPFC), which then inhibited activity in the hippocampus, a key region for memory recall.

The activity levels in the ACC and DLPFC remained low for the rest of the trial, a sign of success — the memory was stopped early enough so no more suppression was needed. If the memory was not suppressed in time, the ACC generated a reactive alarm, increasing its activity to signal to the DLPFC to stop the intrusion.

Check more details on this site.

Reference: “Anterior Cingulate Cortex Signals the Need to Control Intrusive Thoughts During Motivated Forgetting” by Maité Crespo García, Yulin Wang, Mojun Jiang, Michael C. Anderson and Xu Lei, 18 April 2022, JNeurosci.

 

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