Answer:
NO
Step-by-step explanation:
It makes no sense to define mental states as identical to brain activity because all mental states from sensation to emotion and imagination; produce some degree of feeling but it cannot be said so to be, concerning brain activities such as neurons firing, electro-chemical impulses, etc.
Does it make sense, for example, to define LOVE as simply neuron firings: No, because neuron firing do not produce mental states of feeling, they are just activities taking place without people having any sensation of such.