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Methodology

Methodology

For their recent study, Paci et al. (2022) encoded a fear memory by pairing a mild electric foot shock with an audible tone. Once their lab rats were conditioned to fear the auditory tone by itself, they implanted electrodes to monitor neuronal activity within the PAG. When the rats heard the fear-conditioned tone, it triggered a momentary freeze response, and specific neurons in the PAG simultaneously "lit up."

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Impact of Findings

Impact of Findings

This research increases our understanding of how survival networks rooted in subcortical brain areas cause the body to automatically freeze in response to fear. When the cerebellum is functioning well, a momentary freeze response promotes survival. However, Paci et al. (2022) found that when cere...

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Research

Research

Neuroscientists at the University of Bristol have discovered fear mechanisms rooted in the cerebellum that could lead to new anti-anxiety medications and treatments for post-traumatic stress disorder a.k.a PTSD (

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As Part of a Survival Network, the Cerebellum and PAG Coordinate Perfectly-Timed "Freeze" Responses

As Part of a Survival Network, the Cerebellum and PAG Coordinate Perfectly-Timed "Freeze" Responses

Notably, when a rat's cerebellum was functioning properly, the freeze response was brief and didn't stop an animal in its tracks for too long.

However, Paci et al. (2022) found that when the cerebellum's ability to communicate with the PAG was blocked, freeze responses went into overdrive a...

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Research in Rats

Research in Rats

In animal experiments using fear-conditioned rats, Paci et al. (2022) found that the cerebellum modulates how another brain area called the periaqueductal gray (PAG) triggers automatic defensive behaviors such as freezing in place during times of perceived danger.

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Key Points

Key Points

  • A well-functioning cerebellum coordinates fluid movements and calibrates freeze responses as part of the brain's survival network
  • If freezing in place is a good survival strategy, the cerebellum automatically initiates a quick, momentary freeze response
  • If the cerebellum dysf...

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Findings

Findings

The findings suggest that the cerebellum plays a crucial role in coordinating perfectly-timed behavioral responses to threatening stimuli. But cerebellar dysfunctions can cause havoc with perfectly-timed freeze responses. Without a well-functioning cerebellum, the freeze response lasts too long.

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PACI ET AL., 2022

"These findings show that the cerebellum is a part of the brain's survival network which regulates fear-memory processes. [This study] raises the possibility that disruption of the cerebellum might underlie anxiety and other fear-related disorders, th...

PACI ET AL., 2022

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What Does the Cerebellum Do?

What Does the Cerebellum Do?

The cerebellum coordinates fluid motor movements in sports and daily life. It also coordinates our thoughts, as well as coordinating our movements. As part of a survival network, it facilitates gracefully taking flight, fighting it out with well-coordinated muscle movements, or freezing in place ...

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"Importantly, our results show that the cerebellum is part of the brain's survival network that regulates fear memory processes at multiple timescales and in multiple ways; raising the possibility that dysfunctional interactions in the brain's cerebellar-survival netwo...

PACI ET AL. (2022)

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"Until now, little was understood about how the cerebellum modulates neuronal activity in other brain regions, especially those related to fear and anxiety"

PACI ET AL. (2022)

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CURATED FROM

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ethanisaac01

21 | he/him

New research on fear-induced "freeze" responses

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