That doesn't sound very scientific; actually it would mean that a guy with a normal-sized head and a really tiny body would be the smartest person ever.

Squid are very smart:
What distinguishes cephalopods from other molluscs are their brains. Squids and octopus have the largest brains of any invertebrates, placing them at the pinnacle of invertebrate evolution. Their ability to sense and processes environmental information places them on an level equivalent to many vertebrates, including the fishes. The learning abilities of octopus are well documented and their intelligence has been compared to that of canine puppies.[/b]
from: http://www.oceansonline.com/squids2.htm