That was not the handiwork of a particularly clever or complex brain.

Kaas's approach is to try to understand how complex brains evolved from ancestor forms which had relatively few areas.

It might be thought that courtship only occurs in the kind of animals which have fairly complex brains, such as mammals and birds.

He is a man with a complex brain.

Researchers are interested in figuring out how mammals evolved such large and complex brains.

The great white, in fact, possesses a large and complex brain.

These were the synapses of the enemy's brain - mysterious, complex, animate.

Humans have a complex brain, which lets them use language, make ideas, and feel emotions.

A less complex brain could not possess the Three Laws in full measure.