How does someone's brain activity change under the influence of magic mushrooms? A new study may hold the answers.
conditions. But what do we actually know about what happens in the brain when we consume these substances? Down to the level of single brain cells, what produces these effects? In ourTo do so, we looked at the effect of a 2 mg/kg dose of psilocybin, the active ingredient in, on the brains of awake mice by using electrodes that enable the recording of neural activity from single brain cells , networks of neurons, and cumulative brain wave activity, known as local field potential .
In general, brain waves occur at a range of different frequencies. We found that slower oscillations were significantly reduced by psilocybin, whilst the power of faster gamma waves resulted in an increase. These oscillations have many functions in the brain, one of which is to enable communication between one region and another.
When we combine all of our findings, it would appear that psilocybin reduces intercommunication between the anterior cingulate cortex and distant brain regions and makes activity both more excitable and more irregular. These results support the idea put forward by Robin Carhart-Harris and Karl Friston in their REBUS model , which posits that psychedelics disrupt the influence of top-down modulation upon sensory information coming into the brain, instead favouring incoming sensory input.
Perhaps the disruption to neural activity we found in the anterior cingulate cortex is symptomatic of this reduced influence of top-down processing regions on brain activity. However, as is always true of science, this is merely a data point from which to perform further research to get closer to the ground truth of what psilocybin is doing to brain activity, though, hopefully it is a data point that has taken us one step farther on that path.Golden, C.T., & Chadderton, P. .
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