How long does the brain stay active after death

Interesting About brain....

1. How long does the brain stay active after death? What happens to all the memories? BY ..........KHUSH BS CARDIOLOGY KHYBER MEDICAL UNIVERsity

2. ANSWERED Firstly, a person is not declared until and unless there are no brian waves. Now coming to the question, the brain can survive for up to about six minutes after the heart stops. The reason to learn CPR is that if it is started within six minutes of cardiac arrest, the brain may survive the lack of oxygen. After about six minutes without CPR, however, the brain begins to die.

3. CONTI...... Lets talk about the memory part, Well there are multiple levels of memory, some of which would die immediately, some of which would take some time. So the answer is: it depends; some immediately, some only very slowly.

4. CONTI...... At the highest level, the current neuronal firing state of the brain encodes memory on a very short scale - working memory. The memory held on this level does not have a clear anatomical counterpart. It equals very short-term memory/STM sequences, such as the words you read just before you read the words you're reading right now. This memory is lost immediately when you lose consciousness, at least to some degree; as this memory is hard to even strictly distinguish from consciousness and attention.

5. CONTI...... Other forms of short-term memory/STM are stored in a slightly different form: short-term potentation, the adaption of neuronal responses following brief and intense stimulation. Spike Frequency Adaption/SFA is at an intermediate stage between this and the previous level. Short-term potentation and SFA decay within minutes or even seconds if they are not transferred into some more durable form of memory.

6. CONTI...... Long-term memory (/LTM) stores have specific anatomical correlates; they are stored in, amongst others, the synaptic weights (i.e. the amount of influence the firing of one neuron has on another). Some forms of LTM are best located in cortical synapses, others in the hippocampus. An even more fundamental, long-term, durable storage form is the wiring itself; not just the weights, but the existence of a synapse between two points, or not These can be considered a form of memory that will remain intact for the longer time period.

7. CONTI...... However, the more direct answer to the question s that once a large amount of neurons have died (brain death), there is currently no way one can access a non-trivial amount of memory. As long as this is averted, nontrivial amounts of memory can be recovered.

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