[red75prime]

...assuming that modelling the physical structure of the brain is the only way to model its functions.

[formerly_proven]

Building a "NN with similar capability as the brain" is not modelling its physical structure. The assumption is not made.

[red75prime]

Let's define the terms. What does it mean "with similar capacity"? As far as I understand xvilka was taking about the number of artificial neurons required to model a biological neuron times the number of biological neurons in the human brain. It is modelling its physical structure (on a neuronal level).

[Chu4eeno]

You vastly overestimate how much we know about how our brains work.

Look up the neural correlates replication crisis, and e. g. the "dead salmon" study by Bennett et al.

[red75prime]

That is we have unknowns that might increase or decrease estimates of computational demands of a functionally equivalent ANN. Not everything that happens in the brain contributes to information processing.