I thought this was a topical letter from 2014 which provides some useful information that supports my view that the brain can continue to have some function (albeit not wakeful consciousness), well after 20 seconds of cardiac arrest, up to perhaps a few minutes, and that this period of continued functioning might be extended further by CPR...
I've also quoted from referenced paper [3] further below for readers ease of reference... which shows stark differences in how thalamus neurons respond to oxygen and glucose deprivation, in comparison to deeper brain neurons within the hypothalamus.
Here’s a diagram (Fig. 1.) I produced during 2013, to aid me in thinking about the relationships between the sense of space I experience with different states/senses during wakefulness.
When I say, ‘sense of space’, what I’m really talking about is my perception of the location for each of these states/senses, in relation to where my sense of ‘self’ is currently located. If your not sure what I’m talking about, don’t give up, it should become clearer as you read more.
![[Image: when_is_the_brain_dead.png]](https://thinkingdeeper.files.wordpress.com/2017/03/when_is_the_brain_dead.png)
![[Image: spatial_perception.jpg]](https://thinkingdeeper.files.wordpress.com/2014/07/spatial_perception.jpg)
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