For years, marine scientists have proclaimed the high intelligence of dolphins – and now it appears the humpback whale is also among the bright sparks of the deep.

Researchers in the US have discovered that humpback whales have a type of brain cell seen only in humans, the great apes, and other cetaceans such as dolphins.

Studying the brains of humpbacks, Patrick Hof and Estel Van der Gucht of the Department of Neuroscience at Mount Sinai School of Medicine in New York discovered a type of cell known as a spindle neuron in the cortex, in areas comparable to where they are seen in humans and great apes.

Although the function of spindle neurons is not well understood, they may be involved in processes of cognition - learning, remembering and recognising the world around oneself. The cells are also thought by some to be affected by Alzheimer’s disease and other debilitating brain disorders such as autism and schizophrenia.

The findings may help to explain some of the distinctive traits exhibited by whales, such as sophisticated communication skills, the ability to form alliances and co-operate, the researchers report in The Anatomical Record.

They say their study may subsequently indicate that such whales are more intelligent than they have been given credit for, and suggests that spindle neurons – the likely basis for complex brains - either evolved more than once, or have gone unused by most species of animals, kept only in those with the largest brains.

"In spite of the relative scarcity of information on many cetacean species, it is important to note in this context that sperm whales, killer whales, and certainly humpback whales, exhibit complex social patterns that included intricate communication skills, coalition-formation, co-operation, cultural transmission and tool usage," the researchers write.

"It is thus likely that some of these abilities are related to comparable histologic complexity in brain organisation in cetaceans and in hominids."

They say the spindle neurons found in humpback whales were discovered in the same location as toothed whales, suggesting that the cells may be related to brain size, reported Reuters.

Toothed whales, such as orcas, are generally considered more intelligent than baleen whales such as humpbacks and blue whales, which filter water for their food.

The humpback whales also had structures resembling "islands" in the cerebral cortex, also seen in some other mammals and which may have evolved in order to promote fast and efficient communication between neurons.

Spindle neurons are thought to have first appeared in the common ancestor of hominids, humans and great apes about 15 million years ago, the researchers added. In cetaceans they would have evolved earlier, possibly as early as 30 million years ago.

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