How much brains do a dolphin have?

A dolphins brain and therefore its cerebral cortex is about the same size as a humans, however some dolphin species have a more deeply folded cerebral cortex than in humans but the cortex itself is not as thick. The level of folding found in the dolphins brain is so similar to that of humans as to suggest that they have a level of intelligence comparable to our own. So to answer the question what is the size of a dolphins cerebral cortex, the data seams to suggest it is about the same as our own.